swr/rast: Renamed variable in vertexbufferstate
[mesa.git] / src / gallium / drivers / swr / rasterizer / jitter / fetch_jit.cpp
index fd4bf151d5f7b16838c5b14ea31f4a28a5ed41df..aa2d4c365717c6bc1956b09fc33fdcbe6f369a14 100644 (file)
 * Notes:
 *
 ******************************************************************************/
+#include "jit_pch.hpp"
+#include "builder.h"
 #include "jit_api.h"
 #include "fetch_jit.h"
-#include "builder.h"
-#include "state_llvm.h"
-#include <sstream>
-#include <tuple>
+#include "gen_state_llvm.h"
 
 //#define FETCH_DUMP_VERTEX 1
+using namespace llvm;
+using namespace SwrJit;
 
 bool isComponentEnabled(ComponentEnable enableMask, uint8_t component);
 
@@ -44,16 +45,25 @@ enum ConversionType
     CONVERT_NORMALIZED,
     CONVERT_USCALED,
     CONVERT_SSCALED,
+    CONVERT_SFIXED,
 };
 
+#if USE_SIMD16_SHADERS
+#define USE_SIMD16_GATHERS 0
+#endif
+
 //////////////////////////////////////////////////////////////////////////
 /// Interface to Jitting a fetch shader
 //////////////////////////////////////////////////////////////////////////
-struct FetchJit : public Builder
+struct FetchJit : 
+    public Builder
 {
-    FetchJit(JitManager* pJitMgr) : Builder(pJitMgr){};
+    FetchJit(JitManager* pJitMgr) :
+        Builder(pJitMgr)
+    {}
 
     Function* Create(const FETCH_COMPILE_STATE& fetchState);
+
     Value* GetSimdValid32bitIndices(Value* vIndices, Value* pLastIndex);
     Value* GetSimdValid16bitIndices(Value* vIndices, Value* pLastIndex);
     Value* GetSimdValid8bitIndices(Value* vIndices, Value* pLastIndex);
@@ -62,45 +72,88 @@ struct FetchJit : public Builder
     typedef std::tuple<Value*&, Value*, const Instruction::CastOps, const ConversionType,
         uint32_t&, uint32_t&, const ComponentEnable, const ComponentControl(&)[4], Value*(&)[4],
         const uint32_t(&)[4]> Shuffle8bpcArgs;
+
+#if USE_SIMD16_SHADERS
+#if USE_SIMD16_GATHERS
+    void Shuffle8bpcGatherd16(Shuffle8bpcArgs &args);
+#else
+    void Shuffle8bpcGatherd(Shuffle8bpcArgs &args, bool useVertexID2);
+#endif
+#else
     void Shuffle8bpcGatherd(Shuffle8bpcArgs &args);
+#endif
 
     typedef std::tuple<Value*(&)[2], Value*, const Instruction::CastOps, const ConversionType,
         uint32_t&, uint32_t&, const ComponentEnable, const ComponentControl(&)[4], Value*(&)[4]> Shuffle16bpcArgs;
+
+#if USE_SIMD16_SHADERS
+#if USE_SIMD16_GATHERS
+    void Shuffle16bpcGather16(Shuffle16bpcArgs &args);
+#else
+    void Shuffle16bpcGather(Shuffle16bpcArgs &args, bool useVertexID2);
+#endif
+#else
     void Shuffle16bpcGather(Shuffle16bpcArgs &args);
+#endif
 
+#if USE_SIMD16_GATHERS
+    void StoreVertexElements16(Value* pVtxOut, const uint32_t outputElt, const uint32_t numEltsToStore, Value* (&vVertexElements)[4]);
+#else
     void StoreVertexElements(Value* pVtxOut, const uint32_t outputElt, const uint32_t numEltsToStore, Value* (&vVertexElements)[4]);
+#endif
 
-    Value* GenerateCompCtrlVector(const ComponentControl ctrl);
+#if USE_SIMD16_SHADERS
+#if USE_SIMD16_GATHERS
+    Value *GenerateCompCtrlVector16(const ComponentControl ctrl);
+#else
+    Value *GenerateCompCtrlVector(const ComponentControl ctrl, bool useVertexID2);
+#endif
+#else
+    Value *GenerateCompCtrlVector(const ComponentControl ctrl);
+#endif
 
-    void JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fetchInfo, Value* streams, Value* vIndices, Value* pVtxOut);
-    void JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* fetchInfo, Value* streams, Value* vIndices, Value* pVtxOut);
+    void JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* streams, Value* vIndices, Value* pVtxOut);
+
+#if USE_SIMD16_SHADERS
+#if USE_SIMD16_GATHERS
+    void JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value *streams, Value *vIndices, Value *vIndices2, Value *pVtxOut, bool useVertexID2);
+#else
+    void JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* streams, Value* vIndices, Value* pVtxOut, bool useVertexID2);
+#endif
+#else
+    void JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* streams, Value* vIndices, Value* pVtxOut);
+#endif
 
     bool IsOddFormat(SWR_FORMAT format);
     bool IsUniformFormat(SWR_FORMAT format);
     void UnpackComponents(SWR_FORMAT format, Value* vInput, Value* result[4]);
-    void CreateGatherOddFormats(SWR_FORMAT format, Value* pBase, Value* offsets, Value* result[4]);
+    void CreateGatherOddFormats(SWR_FORMAT format, Value* pMask, Value* pBase, Value* offsets, Value* result[4]);
     void ConvertFormat(SWR_FORMAT format, Value *texels[4]);
 
-    void StoreSGVs(const FETCH_COMPILE_STATE& fetchState, Value* pFetchInfo, Value* pVtxOut);
+    Value* mpFetchInfo;
 };
 
 Function* FetchJit::Create(const FETCH_COMPILE_STATE& fetchState)
 {
-    static std::size_t fetchNum = 0;
-
-    std::stringstream fnName("FetchShader", std::ios_base::in | std::ios_base::out | std::ios_base::ate);
-    fnName << fetchNum++;
+    std::stringstream fnName("FCH_", std::ios_base::in | std::ios_base::out | std::ios_base::ate);
+    fnName << ComputeCRC(0, &fetchState, sizeof(fetchState));
 
     Function*    fetch = Function::Create(JM()->mFetchShaderTy, GlobalValue::ExternalLinkage, fnName.str(), JM()->mpCurrentModule);
     BasicBlock*    entry = BasicBlock::Create(JM()->mContext, "entry", fetch);
 
+    fetch->getParent()->setModuleIdentifier(fetch->getName());
+
     IRB()->SetInsertPoint(entry);
 
-    auto    argitr = fetch->getArgumentList().begin();
+    auto    argitr = fetch->arg_begin();
 
     // Fetch shader arguments
-    Value*    fetchInfo = &*argitr; ++argitr;
-    fetchInfo->setName("fetchInfo");
+    Value* privateContext = &*argitr; ++argitr;
+    privateContext->setName("privateContext");
+    SetPrivateContext(privateContext);
+
+    mpFetchInfo = &*argitr; ++argitr;
+    mpFetchInfo->setName("fetchInfo");
     Value*    pVtxOut = &*argitr;
     pVtxOut->setName("vtxOutput");
     // this is just shorthand to tell LLVM to get a pointer to the base address of simdvertex
@@ -111,77 +164,174 @@ Function* FetchJit::Create(const FETCH_COMPILE_STATE& fetchState)
     std::vector<Value*>    vtxInputIndices(2, C(0));
     // GEP
     pVtxOut = GEP(pVtxOut, C(0));
+#if USE_SIMD16_SHADERS
+#if 0// USE_SIMD16_BUILDER
+    pVtxOut = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+#else
     pVtxOut = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth), 0));
+#endif
+#else
+    pVtxOut = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth), 0));
+#endif
 
     // SWR_FETCH_CONTEXT::pStreams
-    Value*    streams = LOAD(fetchInfo,{0, SWR_FETCH_CONTEXT_pStreams});
+    Value*    streams = LOAD(mpFetchInfo,{0, SWR_FETCH_CONTEXT_pStreams});
     streams->setName("pStreams");
 
     // SWR_FETCH_CONTEXT::pIndices
-    Value*    indices = LOAD(fetchInfo,{0, SWR_FETCH_CONTEXT_pIndices});
+    Value*    indices = LOAD(mpFetchInfo,{0, SWR_FETCH_CONTEXT_pIndices});
     indices->setName("pIndices");
 
     // SWR_FETCH_CONTEXT::pLastIndex
-    Value*    pLastIndex = LOAD(fetchInfo,{0, SWR_FETCH_CONTEXT_pLastIndex});
+    Value*    pLastIndex = LOAD(mpFetchInfo,{0, SWR_FETCH_CONTEXT_pLastIndex});
     pLastIndex->setName("pLastIndex");
     
 
     Value* vIndices;
+#if USE_SIMD16_SHADERS
+    Value* indices2;
+    Value* vIndices2;
+#endif
     switch(fetchState.indexType)
     {
         case R8_UINT:
             indices = BITCAST(indices, Type::getInt8PtrTy(JM()->mContext, 0));
-            if(fetchState.bDisableIndexOOBCheck){
+#if USE_SIMD16_SHADERS
+            indices2 = GEP(indices, C(8));
+#endif
+            if(fetchState.bDisableIndexOOBCheck)
+            {
                 vIndices = LOAD(BITCAST(indices, PointerType::get(VectorType::get(mInt8Ty, mpJitMgr->mVWidth), 0)), {(uint32_t)0});
                 vIndices = Z_EXT(vIndices, mSimdInt32Ty);
+#if USE_SIMD16_SHADERS
+                vIndices2 = LOAD(BITCAST(indices2, PointerType::get(VectorType::get(mInt8Ty, mpJitMgr->mVWidth), 0)), { (uint32_t)0 });
+                vIndices2 = Z_EXT(vIndices2, mSimdInt32Ty);
+#endif
             }
-            else{
+            else
+            {
                 pLastIndex = BITCAST(pLastIndex, Type::getInt8PtrTy(JM()->mContext, 0));
                 vIndices = GetSimdValid8bitIndices(indices, pLastIndex);
+#if USE_SIMD16_SHADERS
+                pLastIndex = BITCAST(pLastIndex, Type::getInt8PtrTy(JM()->mContext, 0));
+                vIndices2 = GetSimdValid8bitIndices(indices2, pLastIndex);
+#endif
             }
             break;
         case R16_UINT: 
             indices = BITCAST(indices, Type::getInt16PtrTy(JM()->mContext, 0)); 
-            if(fetchState.bDisableIndexOOBCheck){
+#if USE_SIMD16_SHADERS
+            indices2 = GEP(indices, C(8));
+#endif
+            if(fetchState.bDisableIndexOOBCheck)
+            {
                 vIndices = LOAD(BITCAST(indices, PointerType::get(VectorType::get(mInt16Ty, mpJitMgr->mVWidth), 0)), {(uint32_t)0});
                 vIndices = Z_EXT(vIndices, mSimdInt32Ty);
+#if USE_SIMD16_SHADERS
+                vIndices2 = LOAD(BITCAST(indices2, PointerType::get(VectorType::get(mInt16Ty, mpJitMgr->mVWidth), 0)), { (uint32_t)0 });
+                vIndices2 = Z_EXT(vIndices2, mSimdInt32Ty);
+#endif
             }
-            else{
+            else
+            {
                 pLastIndex = BITCAST(pLastIndex, Type::getInt16PtrTy(JM()->mContext, 0));
                 vIndices = GetSimdValid16bitIndices(indices, pLastIndex);
+#if USE_SIMD16_SHADERS
+                pLastIndex = BITCAST(pLastIndex, Type::getInt16PtrTy(JM()->mContext, 0));
+                vIndices2 = GetSimdValid16bitIndices(indices2, pLastIndex);
+#endif
             }
             break;
         case R32_UINT:
+#if USE_SIMD16_SHADERS
+            indices2 = GEP(indices, C(8));
+#endif
             (fetchState.bDisableIndexOOBCheck) ? vIndices = LOAD(BITCAST(indices, PointerType::get(mSimdInt32Ty,0)),{(uint32_t)0})
                                                : vIndices = GetSimdValid32bitIndices(indices, pLastIndex);
+#if USE_SIMD16_SHADERS
+            (fetchState.bDisableIndexOOBCheck) ? vIndices2 = LOAD(BITCAST(indices2, PointerType::get(mSimdInt32Ty, 0)), { (uint32_t)0 })
+                                               : vIndices2 = GetSimdValid32bitIndices(indices2, pLastIndex);
+#endif
             break; // incoming type is already 32bit int
-        default: SWR_ASSERT(0, "Unsupported index type"); vIndices = nullptr; break;
+        default: SWR_INVALID("Unsupported index type"); vIndices = nullptr; break;
+    }
+
+    if(fetchState.bForceSequentialAccessEnable)
+    {
+        Value* pOffsets = C({ 0, 1, 2, 3, 4, 5, 6, 7 });
+
+        // VertexData buffers are accessed sequentially, the index is equal to the vertex number
+        vIndices = VBROADCAST(LOAD(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_StartVertex }));
+        vIndices = ADD(vIndices, pOffsets);
+#if USE_SIMD16_SHADERS
+        vIndices2 = ADD(vIndices, VIMMED1(8));
+#endif
+    }
+
+    Value* vVertexId = vIndices;
+#if USE_SIMD16_SHADERS
+    Value* vVertexId2 = vIndices2;
+#endif
+    if (fetchState.bVertexIDOffsetEnable)
+    {
+        // Assuming one of baseVertex or startVertex is 0, so adding both should be functionally correct
+        Value* vBaseVertex = VBROADCAST(LOAD(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_BaseVertex }));
+        Value* vStartVertex = VBROADCAST(LOAD(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_StartVertex }));
+        vVertexId = ADD(vIndices, vBaseVertex);
+        vVertexId = ADD(vVertexId, vStartVertex);
+#if USE_SIMD16_SHADERS
+        vVertexId2 = ADD(vIndices2, vBaseVertex);
+        vVertexId2 = ADD(vVertexId2, vStartVertex);
+#endif
     }
 
     // store out vertex IDs
-    STORE(vIndices, GEP(fetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID }));
+    STORE(vVertexId, GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID }));
+#if USE_SIMD16_SHADERS
+    STORE(vVertexId2, GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID2 }));
+#endif
 
     // store out cut mask if enabled
     if (fetchState.bEnableCutIndex)
     {
         Value* vCutIndex = VIMMED1(fetchState.cutIndex);
         Value* cutMask = VMASK(ICMP_EQ(vIndices, vCutIndex));
-        STORE(cutMask, GEP(fetchInfo, { 0, SWR_FETCH_CONTEXT_CutMask }));
+        STORE(cutMask, GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_CutMask }));
+#if USE_SIMD16_SHADERS
+        Value* cutMask2 = VMASK(ICMP_EQ(vIndices2, vCutIndex));
+        STORE(cutMask2, GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_CutMask2 }));
+#endif
     }
 
     // Fetch attributes from memory and output to a simdvertex struct
     // since VGATHER has a perf penalty on HSW vs BDW, allow client to choose which fetch method to use
-    (fetchState.bDisableVGATHER) ? JitLoadVertices(fetchState, fetchInfo, streams, vIndices, pVtxOut)
-                                 : JitGatherVertices(fetchState, fetchInfo, streams, vIndices, pVtxOut);
-
-    // Store out SGVs if enabled
-    StoreSGVs(fetchState, fetchInfo, pVtxOut);
+#if USE_SIMD16_SHADERS
+    if (fetchState.bDisableVGATHER)
+    {
+        JitLoadVertices(fetchState, streams, vIndices, pVtxOut);
+        JitLoadVertices(fetchState, streams, vIndices2, GEP(pVtxOut, C(1)));
+    }
+    else
+    {
+#if USE_SIMD16_GATHERS
+        JitGatherVertices(fetchState, streams, vIndices, vIndices2, pVtxOut, false);
+#else
+        JitGatherVertices(fetchState, streams, vIndices, pVtxOut, false);
+        JitGatherVertices(fetchState, streams, vIndices2, GEP(pVtxOut, C(1)), true);
+#endif
+    }
+#else
+    (fetchState.bDisableVGATHER) ? JitLoadVertices(fetchState, streams, vIndices, pVtxOut)
+                                 : JitGatherVertices(fetchState, streams, vIndices, pVtxOut);
+#endif
 
     RET_VOID();
 
     JitManager::DumpToFile(fetch, "src");
 
+#if defined(_DEBUG)
     verifyFunction(*fetch);
+#endif
 
     ::FunctionPassManager setupPasses(JM()->mpCurrentModule);
 
@@ -211,25 +361,8 @@ Function* FetchJit::Create(const FETCH_COMPILE_STATE& fetchState)
 
     JitManager::DumpToFile(fetch, "opt");
 
-    return fetch;
-}
-
-// store vertex ID and instance ID if enabled
-void FetchJit::StoreSGVs(const FETCH_COMPILE_STATE& fetchState, Value* pFetchInfo, Value* pVtxOut)
-{
-    if (fetchState.InstanceIdEnable)
-    {
-        Value* pId = BITCAST(VBROADCAST(LOAD(GEP(pFetchInfo, { 0, SWR_FETCH_CONTEXT_CurInstance }))), mSimdFP32Ty);
-        Value* pDest = GEP(pVtxOut, C(fetchState.InstanceIdElementOffset * 4 + fetchState.InstanceIdComponentNumber), "instanceID");
-        STORE(pId, pDest);
-    }
 
-    if (fetchState.VertexIdEnable)
-    {
-        Value* pId = BITCAST(LOAD(GEP(pFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID })), mSimdFP32Ty);
-        Value* pDest = GEP(pVtxOut, C(fetchState.VertexIdElementOffset * 4 + fetchState.VertexIdComponentNumber), "vertexID");
-        STORE(pId, pDest);
-    }
+    return fetch;
 }
 
 //////////////////////////////////////////////////////////////////////////
@@ -241,7 +374,7 @@ void FetchJit::StoreSGVs(const FETCH_COMPILE_STATE& fetchState, Value* pFetchInf
 /// @param streams - value pointer to the current vertex stream
 /// @param vIndices - vector value of indices to load
 /// @param pVtxOut - value pointer to output simdvertex struct
-void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fetchInfo, Value* streams, Value* vIndices, Value* pVtxOut)
+void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* streams, Value* vIndices, Value* pVtxOut)
 {
     // Zack shuffles; a variant of the Charleston.
 
@@ -254,10 +387,10 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
     Constant* promoteMask = ConstantVector::get(pMask);
     Constant* uwvec = UndefValue::get(VectorType::get(mFP32Ty, 4));
 
-    Value* startVertex = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_StartVertex});
-    Value* startInstance = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_StartInstance});
-    Value* curInstance = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_CurInstance});
-    Value* vBaseVertex = VBROADCAST(LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_BaseVertex}));
+    Value* startVertex = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_StartVertex});
+    Value* startInstance = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_StartInstance});
+    Value* curInstance = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_CurInstance});
+    Value* vBaseVertex = VBROADCAST(LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_BaseVertex}));
     curInstance->setName("curInstance");
 
     for(uint32_t nelt = 0; nelt < fetchState.numAttribs; ++nelt)
@@ -274,11 +407,16 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
 
         vectors.clear();
 
+        if (fetchState.bInstanceIDOffsetEnable)
+        {
+            SWR_ASSERT((0), "TODO: Fill out more once driver sends this down");
+        }
+
         Value *vCurIndices;
         Value *startOffset;
         if(ied.InstanceEnable)
         {
-            Value* stepRate = C(ied.InstanceDataStepRate);
+            Value* stepRate = C(ied.InstanceAdvancementState);
 
             // prevent a div by 0 for 0 step rate
             Value* isNonZeroStep = ICMP_UGT(stepRate, C(0));
@@ -294,6 +432,10 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
 
             startOffset = startInstance;
         }
+        else if (ied.InstanceStrideEnable)
+        {
+            SWR_ASSERT((0), "TODO: Fill out more once driver sends this down.");
+        }
         else
         {
             // offset indices by baseVertex
@@ -303,7 +445,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
         }
 
         // load SWR_VERTEX_BUFFER_STATE::pData
-        Value *stream = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_pData});
+        Value *stream = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_xpData});
 
         // load SWR_VERTEX_BUFFER_STATE::pitch
         Value *stride = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_pitch});
@@ -315,11 +457,29 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
 
         Value* startVertexOffset = MUL(Z_EXT(startOffset, mInt64Ty), stride);
 
+        Value *minVertex = NULL;
+        Value *minVertexOffset = NULL;
+        if (fetchState.bPartialVertexBuffer) {
+            // fetch min index for low bounds checking
+            minVertex = GEP(streams, {C(ied.StreamIndex), C(SWR_VERTEX_BUFFER_STATE_minVertex)});
+            minVertex = LOAD(minVertex);
+            if (!fetchState.bDisableIndexOOBCheck) {
+                minVertexOffset = MUL(Z_EXT(minVertex, mInt64Ty), stride);
+            }
+        }
+
         // Load from the stream.
         for(uint32_t lane = 0; lane < mVWidth; ++lane)
         {
             // Get index
             Value* index = VEXTRACT(vCurIndices, C(lane));
+
+            if (fetchState.bPartialVertexBuffer) {
+                // clamp below minvertex
+                Value *isBelowMin = ICMP_SLT(index, minVertex);
+                index = SELECT(isBelowMin, minVertex, index);
+            }
+
             index = Z_EXT(index, mInt64Ty);
 
             Value*    offset = MUL(index, stride);
@@ -327,10 +487,14 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
             offset = ADD(offset, startVertexOffset);
 
             if (!fetchState.bDisableIndexOOBCheck) {
-                // check for out of bound access, including partial OOB, and mask them to 0
+                // check for out of bound access, including partial OOB, and replace them with minVertex
                 Value *endOffset = ADD(offset, C((int64_t)info.Bpp));
                 Value *oob = ICMP_ULE(endOffset, size);
-                offset = SELECT(oob, offset, ConstantInt::get(mInt64Ty, 0));
+                if (fetchState.bPartialVertexBuffer) {
+                    offset = SELECT(oob, offset, minVertexOffset);
+                } else {
+                    offset = SELECT(oob, offset, ConstantInt::get(mInt64Ty, 0));
+                }
             }
 
             Value*    pointer = GEP(stream, offset);
@@ -343,7 +507,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                 case 8: vptr = BITCAST(pointer, PointerType::get(VectorType::get(mInt8Ty, 4), 0)); break;
                 case 16: vptr = BITCAST(pointer, PointerType::get(VectorType::get(mInt16Ty, 4), 0)); break;
                 case 32: vptr = BITCAST(pointer, PointerType::get(VectorType::get(mFP32Ty, 4), 0)); break;
-                default: SWR_ASSERT(false, "Unsupported underlying bpp!");
+                default: SWR_INVALID("Unsupported underlying bpp!");
             }
 
             // load 4 components of attribute
@@ -364,7 +528,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                             vec = FMUL(vec, ConstantVector::get(std::vector<Constant*>(4, ConstantFP::get(mFP32Ty, 1.0 / 65535.0))));
                             break;
                         default:
-                            SWR_ASSERT(false, "Unsupported underlying type!");
+                            SWR_INVALID("Unsupported underlying type!");
                             break;
                     }
                     break;
@@ -380,7 +544,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                             vec = FMUL(vec, ConstantVector::get(std::vector<Constant*>(4, ConstantFP::get(mFP32Ty, 1.0 / 32768.0))));
                             break;
                         default:
-                            SWR_ASSERT(false, "Unsupported underlying type!");
+                            SWR_INVALID("Unsupported underlying type!");
                             break;
                     }
                     break;
@@ -396,7 +560,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                         case 32:
                             break; // Pass through unchanged.
                         default:
-                            SWR_ASSERT(false, "Unsupported underlying type!");
+                            SWR_INVALID("Unsupported underlying type!");
                             break;
                     }
                     break;
@@ -412,7 +576,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                         case 32:
                             break; // Pass through unchanged.
                         default:
-                            SWR_ASSERT(false, "Unsupported underlying type!");
+                            SWR_INVALID("Unsupported underlying type!");
                             break;
                     }
                     break;
@@ -422,7 +586,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                         case 32:
                             break; // Pass through unchanged.
                         default:
-                            SWR_ASSERT(false, "Unsupported underlying type!");
+                            SWR_INVALID("Unsupported underlying type!");
                     }
                     break;
                 case SWR_TYPE_USCALED:
@@ -431,9 +595,12 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
                 case SWR_TYPE_SSCALED:
                     vec = SI_TO_FP(vec, VectorType::get(mFP32Ty, 4));
                     break;
+                case SWR_TYPE_SFIXED:
+                    vec = FMUL(SI_TO_FP(vec, VectorType::get(mFP32Ty, 4)), VBROADCAST(C(1/65536.0f)));
+                    break;
                 case SWR_TYPE_UNKNOWN:
                 case SWR_TYPE_UNUSED:
-                    SWR_ASSERT(false, "Unsupported type %d!", info.type[0]);
+                    SWR_INVALID("Unsupported type %d!", info.type[0]);
             }
 
             // promote mask: sse(0,1,2,3) | avx(0,1,2,3,4,4,4,4)
@@ -512,7 +679,11 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
 
         for(uint32_t c = 0; c < 4; ++c)
         {
+#if USE_SIMD16_SHADERS
+            Value* dest = GEP(pVtxOut, C(nelt * 8 + c * 2), "destGEP");
+#else
             Value* dest = GEP(pVtxOut, C(nelt * 4 + c), "destGEP");
+#endif
             STORE(elements[c], dest);
         }
     }
@@ -522,7 +693,7 @@ void FetchJit::JitLoadVertices(const FETCH_COMPILE_STATE &fetchState, Value* fet
 bool FetchJit::IsOddFormat(SWR_FORMAT format)
 {
     const SWR_FORMAT_INFO& info = GetFormatInfo(format);
-    if (info.bpc[0] != 8 && info.bpc[0] != 16 && info.bpc[0] != 32)
+    if (info.bpc[0] != 8 && info.bpc[0] != 16 && info.bpc[0] != 32 && info.bpc[0] != 64)
     {
         return true;
     }
@@ -571,53 +742,86 @@ void FetchJit::UnpackComponents(SWR_FORMAT format, Value* vInput, Value* result[
 // gather for odd component size formats
 // gather SIMD full pixels per lane then shift/mask to move each component to their
 // own vector
-void FetchJit::CreateGatherOddFormats(SWR_FORMAT format, Value* pBase, Value* offsets, Value* result[4])
+void FetchJit::CreateGatherOddFormats(SWR_FORMAT format, Value* pMask, Value* pBase, Value* pOffsets, Value* pResult[4])
 {
     const SWR_FORMAT_INFO &info = GetFormatInfo(format);
 
     // only works if pixel size is <= 32bits
     SWR_ASSERT(info.bpp <= 32);
 
-    Value* gather = VUNDEF_I();
-
-    // assign defaults
-    for (uint32_t comp = 0; comp < 4; ++comp)
+    Value *pGather;
+    if (info.bpp == 32)
     {
-        result[comp] = VIMMED1((int)info.defaults[comp]);
+        pGather = GATHERDD(VIMMED1(0), pBase, pOffsets, pMask);
     }
-
-    // gather SIMD pixels
-    for (uint32_t e = 0; e < JM()->mVWidth; ++e)
+    else
     {
-        Value* elemOffset = VEXTRACT(offsets, C(e));
-        Value* load = GEP(pBase, elemOffset);
+        // Can't use 32-bit gather for items less than 32-bits, could cause page faults.
+        Value *pMem = ALLOCA(mSimdInt32Ty);
+        STORE(VIMMED1(0u), pMem);
+
+        pBase = BITCAST(pBase, PointerType::get(mInt8Ty, 0));
+        Value* pDstMem = BITCAST(pMem, mInt32PtrTy);
 
-        // load the proper amount of data based on component size
-        switch (info.bpp)
+        for (uint32_t lane = 0; lane < mVWidth; ++lane)
         {
-        case 8: load = POINTER_CAST(load, Type::getInt8PtrTy(JM()->mContext)); break;
-        case 16: load = POINTER_CAST(load, Type::getInt16PtrTy(JM()->mContext)); break;
-        case 32: load = POINTER_CAST(load, Type::getInt32PtrTy(JM()->mContext)); break;
-        default: SWR_ASSERT(0);
-        }
+            // Get index
+            Value* index = VEXTRACT(pOffsets, C(lane));
+            Value* mask = VEXTRACT(pMask, C(lane));
+            switch (info.bpp)
+            {
+            case 8:
+            {
+                Value* pDst = BITCAST(GEP(pDstMem, C(lane)), PointerType::get(mInt8Ty, 0));
+                Value* pSrc = BITCAST(GEP(pBase, index), PointerType::get(mInt8Ty, 0));
+                STORE(LOAD(SELECT(mask, pSrc, pDst)), pDst);
+                break;
+            }
 
-        // load pixel
-        Value *val = LOAD(load);
+            case 16:
+            {
+                Value* pDst = BITCAST(GEP(pDstMem, C(lane)), PointerType::get(mInt16Ty, 0));
+                Value* pSrc = BITCAST(GEP(pBase, index), PointerType::get(mInt16Ty, 0));
+                STORE(LOAD(SELECT(mask, pSrc, pDst)), pDst);
+                break;
+            }
+            break;
+
+            case 24:
+            {
+                // First 16-bits of data
+                Value* pDst = BITCAST(GEP(pDstMem, C(lane)), PointerType::get(mInt16Ty, 0));
+                Value* pSrc = BITCAST(GEP(pBase, index), PointerType::get(mInt16Ty, 0));
+                STORE(LOAD(SELECT(mask, pSrc, pDst)), pDst);
+
+                // Last 8-bits of data
+                pDst = BITCAST(GEP(pDst, C(1)), PointerType::get(mInt8Ty, 0));
+                pSrc = BITCAST(GEP(pSrc, C(1)), PointerType::get(mInt8Ty, 0));
+                STORE(LOAD(SELECT(mask, pSrc, pDst)), pDst);
+                break;
+            }
 
-        // zero extend to 32bit integer
-        val = INT_CAST(val, mInt32Ty, false);
+            default:
+                SWR_INVALID("Shouldn't have BPP = %d now", info.bpp);
+                break;
+            }
+        }
+
+        pGather = LOAD(pMem);
+    }
 
-        // store in simd lane
-        gather = VINSERT(gather, val, C(e));
+    for (uint32_t comp = 0; comp < 4; ++comp)
+    {
+        pResult[comp] = VIMMED1((int)info.defaults[comp]);
     }
 
-    UnpackComponents(format, gather, result);
+    UnpackComponents(format, pGather, pResult);
 
     // cast to fp32
-    result[0] = BITCAST(result[0], mSimdFP32Ty);
-    result[1] = BITCAST(result[1], mSimdFP32Ty);
-    result[2] = BITCAST(result[2], mSimdFP32Ty);
-    result[3] = BITCAST(result[3], mSimdFP32Ty);
+    pResult[0] = BITCAST(pResult[0], mSimdFP32Ty);
+    pResult[1] = BITCAST(pResult[1], mSimdFP32Ty);
+    pResult[2] = BITCAST(pResult[2], mSimdFP32Ty);
+    pResult[3] = BITCAST(pResult[3], mSimdFP32Ty);
 }
 
 void FetchJit::ConvertFormat(SWR_FORMAT format, Value *texels[4])
@@ -682,24 +886,40 @@ void FetchJit::ConvertFormat(SWR_FORMAT format, Value *texels[4])
 //////////////////////////////////////////////////////////////////////////
 /// @brief Loads attributes from memory using AVX2 GATHER(s)
 /// @param fetchState - info about attributes to be fetched from memory
-/// @param fetchInfo - first argument passed to fetch shader
 /// @param streams - value pointer to the current vertex stream
 /// @param vIndices - vector value of indices to gather
 /// @param pVtxOut - value pointer to output simdvertex struct
-void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* fetchInfo,
-                                 Value* streams, Value* vIndices, Value* pVtxOut)
+#if USE_SIMD16_SHADERS
+#if USE_SIMD16_GATHERS
+void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState,
+    Value *streams, Value *vIndices, Value *vIndices2, Value *pVtxOut, bool useVertexID2)
+#else
+void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState,
+    Value* streams, Value* vIndices, Value* pVtxOut, bool useVertexID2)
+#endif
+#else
+void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState,
+    Value* streams, Value* vIndices, Value* pVtxOut)
+#endif
 {
     uint32_t currentVertexElement = 0;
     uint32_t outputElt = 0;
     Value* vVertexElements[4];
+#if USE_SIMD16_GATHERS
+    Value *pVtxSrc2[4];
+#endif
 
-    Value* startVertex = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_StartVertex});
-    Value* startInstance = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_StartInstance});
-    Value* curInstance = LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_CurInstance});
-    Value* vBaseVertex = VBROADCAST(LOAD(fetchInfo, {0, SWR_FETCH_CONTEXT_BaseVertex}));
+    Value* startVertex = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_StartVertex});
+    Value* startInstance = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_StartInstance});
+    Value* curInstance = LOAD(mpFetchInfo, {0, SWR_FETCH_CONTEXT_CurInstance});
+#if USE_SIMD16_GATHERS
+    Value* vBaseVertex16 = VBROADCAST_16(LOAD(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_BaseVertex }));
+#else
+    Value* vBaseVertex = VBROADCAST(LOAD(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_BaseVertex }));
+#endif
     curInstance->setName("curInstance");
 
-    for(uint32_t nInputElt = 0; nInputElt < fetchState.numAttribs; ++nInputElt)
+    for (uint32_t nInputElt = 0; nInputElt < fetchState.numAttribs; nInputElt += 1)
     {
         const INPUT_ELEMENT_DESC& ied = fetchState.layout[nInputElt];
 
@@ -713,23 +933,51 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
         SWR_ASSERT((info.bpp != 0), "Unsupported format in JitGatherVertices.");
         uint32_t bpc = info.bpp / info.numComps;  ///@todo Code below assumes all components are same size. Need to fix.
 
-        Value *stream = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_pData});
+        Value *stream = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_xpData});
 
         // VGATHER* takes an *i8 src pointer
-        Value* pStreamBase = BITCAST(stream, PointerType::get(mInt8Ty, 0));
+        Value *pStreamBase = INT_TO_PTR(stream, PointerType::get(mInt8Ty, 0));
 
         Value *stride = LOAD(streams, {ied.StreamIndex, SWR_VERTEX_BUFFER_STATE_pitch});
+#if USE_SIMD16_GATHERS
+        Value *vStride16 = VBROADCAST_16(stride);
+#else
         Value *vStride = VBROADCAST(stride);
+#endif
 
         // max vertex index that is fully in bounds
         Value *maxVertex = GEP(streams, {C(ied.StreamIndex), C(SWR_VERTEX_BUFFER_STATE_maxVertex)});
         maxVertex = LOAD(maxVertex);
 
+        Value *minVertex = NULL;
+        if (fetchState.bPartialVertexBuffer)
+        {
+            // min vertex index for low bounds OOB checking
+            minVertex = GEP(streams, {C(ied.StreamIndex), C(SWR_VERTEX_BUFFER_STATE_minVertex)});
+            minVertex = LOAD(minVertex);
+        }
+
+        if (fetchState.bInstanceIDOffsetEnable)
+        {
+            // the InstanceID (curInstance) value is offset by StartInstanceLocation
+            curInstance = ADD(curInstance, startInstance);
+        }
+
+#if USE_SIMD16_GATHERS
+        Value *vCurIndices16;
+#else
         Value *vCurIndices;
+#endif
         Value *startOffset;
-        if(ied.InstanceEnable)
+#if USE_SIMD16_GATHERS
+        Value *vInstanceStride16 = VIMMED1_16(0);
+#else
+        Value *vInstanceStride = VIMMED1(0);
+#endif
+
+        if (ied.InstanceEnable)
         {
-            Value* stepRate = C(ied.InstanceDataStepRate);
+            Value* stepRate = C(ied.InstanceAdvancementState);
 
             // prevent a div by 0 for 0 step rate
             Value* isNonZeroStep = ICMP_UGT(stepRate, C(0));
@@ -741,14 +989,46 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
             // if step rate is 0, every instance gets instance 0
             calcInstance = SELECT(isNonZeroStep, calcInstance, C(0));
 
+#if USE_SIMD16_GATHERS
+            vCurIndices16 = VBROADCAST_16(calcInstance);
+#else
             vCurIndices = VBROADCAST(calcInstance);
+#endif
 
             startOffset = startInstance;
         }
+        else if (ied.InstanceStrideEnable)
+        {
+            // grab the instance advancement state, determines stride in bytes from one instance to the next
+            Value* stepRate = C(ied.InstanceAdvancementState);
+#if USE_SIMD16_GATHERS
+            vInstanceStride16 = VBROADCAST_16(MUL(curInstance, stepRate));
+#else
+            vInstanceStride = VBROADCAST(MUL(curInstance, stepRate));
+#endif
+
+            // offset indices by baseVertex
+#if USE_SIMD16_GATHERS
+            Value *vIndices16 = JOIN_16(vIndices, vIndices2);
+
+            vCurIndices16 = ADD(vIndices16, vBaseVertex16);
+#else
+            vCurIndices = ADD(vIndices, vBaseVertex);
+#endif
+
+            startOffset = startVertex;
+            SWR_ASSERT((0), "TODO: Fill out more once driver sends this down.");
+        }
         else
         {
-            // offset indices by baseVertex            
+            // offset indices by baseVertex
+#if USE_SIMD16_GATHERS
+            Value *vIndices16 = JOIN_16(vIndices, vIndices2);
+
+            vCurIndices16 = ADD(vIndices16, vBaseVertex16);
+#else
             vCurIndices = ADD(vIndices, vBaseVertex);
+#endif
 
             startOffset = startVertex;
         }
@@ -759,38 +1039,125 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
         // calculate byte offset to the start of the VB
         Value* baseOffset = MUL(Z_EXT(startOffset, mInt64Ty), Z_EXT(stride, mInt64Ty));
         pStreamBase = GEP(pStreamBase, baseOffset);
+        Value* pStreamBaseGFX = ADD(stream, baseOffset);
 
         // if we have a start offset, subtract from max vertex. Used for OOB check
         maxVertex = SUB(Z_EXT(maxVertex, mInt64Ty), Z_EXT(startOffset, mInt64Ty));
-        Value* neg = ICMP_SLT(maxVertex, C((int64_t)0));
+        Value* maxNeg = ICMP_SLT(maxVertex, C((int64_t)0));
         // if we have a negative value, we're already OOB. clamp at 0.
-        maxVertex = SELECT(neg, C(0), TRUNC(maxVertex, mInt32Ty));
+        maxVertex = SELECT(maxNeg, C(0), TRUNC(maxVertex, mInt32Ty));
+
+        if (fetchState.bPartialVertexBuffer)
+        {
+            // similary for min vertex
+            minVertex = SUB(Z_EXT(minVertex, mInt64Ty), Z_EXT(startOffset, mInt64Ty));
+            Value *minNeg = ICMP_SLT(minVertex, C((int64_t)0));
+            minVertex = SELECT(minNeg, C(0), TRUNC(minVertex, mInt32Ty));
+        }
 
         // Load the in bounds size of a partially valid vertex
         Value *partialInboundsSize = GEP(streams, {C(ied.StreamIndex), C(SWR_VERTEX_BUFFER_STATE_partialInboundsSize)});
         partialInboundsSize = LOAD(partialInboundsSize);
-        Value* vPartialVertexSize = VBROADCAST(partialInboundsSize);
-        Value* vBpp = VBROADCAST(C(info.Bpp));
-        Value* vAlignmentOffsets = VBROADCAST(C(ied.AlignedByteOffset));
+#if USE_SIMD16_GATHERS
+        Value *vPartialVertexSize = VBROADCAST_16(partialInboundsSize);
+        Value *vBpp = VBROADCAST_16(C(info.Bpp));
+        Value *vAlignmentOffsets = VBROADCAST_16(C(ied.AlignedByteOffset));
+#else
+        Value *vPartialVertexSize = VBROADCAST(partialInboundsSize);
+        Value *vBpp = VBROADCAST(C(info.Bpp));
+        Value *vAlignmentOffsets = VBROADCAST(C(ied.AlignedByteOffset));
+#endif
 
         // is the element is <= the partially valid size
-        Value* vElementInBoundsMask = ICMP_SLE(vBpp, SUB(vPartialVertexSize, vAlignmentOffsets));
+        Value *vElementInBoundsMask = ICMP_SLE(vBpp, SUB(vPartialVertexSize, vAlignmentOffsets));
+
+#if USE_SIMD16_GATHERS
+        // override cur indices with 0 if pitch is 0
+        Value *pZeroPitchMask16 = ICMP_EQ(vStride16, VIMMED1_16(0));
+        vCurIndices16 = SELECT(pZeroPitchMask16, VIMMED1_16(0), vCurIndices16);
+
+        // are vertices partially OOB?
+        Value *vMaxVertex16 = VBROADCAST_16(maxVertex);
+        Value *vPartialOOBMask = ICMP_EQ(vCurIndices16, vMaxVertex16);
+
+        // are vertices fully in bounds?
+        Value *vMaxGatherMask16 = ICMP_ULT(vCurIndices16, vMaxVertex16);
+
+        Value *vGatherMask16;
+
+        if (fetchState.bPartialVertexBuffer)
+        {
+            // are vertices below minVertex limit?
+            Value *vMinVertex16 = VBROADCAST_16(minVertex);
+            Value *vMinGatherMask16 = ICMP_UGE(vCurIndices16, vMinVertex16);
+
+            // only fetch lanes that pass both tests
+            vGatherMask16 = AND(vMaxGatherMask16, vMinGatherMask16);
+        }
+        else
+        {
+            vGatherMask16 = vMaxGatherMask16;
+        }
+
+        // blend in any partially OOB indices that have valid elements
+        vGatherMask16 = SELECT(vPartialOOBMask, vElementInBoundsMask, vGatherMask16);
+
+        // calculate the actual offsets into the VB
+        Value *vOffsets16 = MUL(vCurIndices16, vStride16);
+        vOffsets16 = ADD(vOffsets16, vAlignmentOffsets);
+
+        // if instance stride enable is:
+        //  true  - add product of the instanceID and advancement state to the offst into the VB
+        //  false - value of vInstanceStride has been initialialized to zero
+        vOffsets16 = ADD(vOffsets16, vInstanceStride16);
+
+        // TODO: remove the following simd8 interop stuff once all code paths are fully widened to SIMD16..
+
+        Value *vGatherMask  = EXTRACT_16(vGatherMask16, 0);
+        Value *vGatherMask2 = EXTRACT_16(vGatherMask16, 1);
+
+        Value *vOffsets  = EXTRACT_16(vOffsets16, 0);
+        Value *vOffsets2 = EXTRACT_16(vOffsets16, 1);
+#else
+        // override cur indices with 0 if pitch is 0
+        Value* pZeroPitchMask = ICMP_EQ(vStride, VIMMED1(0));
+        vCurIndices = SELECT(pZeroPitchMask, VIMMED1(0), vCurIndices);
 
         // are vertices partially OOB?
         Value* vMaxVertex = VBROADCAST(maxVertex);
         Value* vPartialOOBMask = ICMP_EQ(vCurIndices, vMaxVertex);
 
-        // are vertices are fully in bounds?
-        Value* vGatherMask = ICMP_ULT(vCurIndices, vMaxVertex);
+        // are vertices fully in bounds?
+        Value* vMaxGatherMask = ICMP_ULT(vCurIndices, vMaxVertex);
+
+        Value *vGatherMask;
+        if (fetchState.bPartialVertexBuffer)
+        {
+            // are vertices below minVertex limit?
+            Value *vMinVertex = VBROADCAST(minVertex);
+            Value *vMinGatherMask = ICMP_UGE(vCurIndices, vMinVertex);
+
+            // only fetch lanes that pass both tests
+            vGatherMask = AND(vMaxGatherMask, vMinGatherMask);
+        }
+        else
+        {
+            vGatherMask = vMaxGatherMask;
+        }
 
         // blend in any partially OOB indices that have valid elements
         vGatherMask = SELECT(vPartialOOBMask, vElementInBoundsMask, vGatherMask);
-        vGatherMask = VMASK(vGatherMask);
 
         // calculate the actual offsets into the VB
         Value* vOffsets = MUL(vCurIndices, vStride);
         vOffsets = ADD(vOffsets, vAlignmentOffsets);
 
+        // if instance stride enable is:
+        //  true  - add product of the instanceID and advancement state to the offst into the VB
+        //  false - value of vInstanceStride has been initialialized to zero
+        vOffsets = ADD(vOffsets, vInstanceStride);
+
+#endif
         // Packing and component control 
         ComponentEnable compMask = (ComponentEnable)ied.ComponentPacking;
         const ComponentControl compCtrl[4] { (ComponentControl)ied.ComponentControl0, (ComponentControl)ied.ComponentControl1, 
@@ -799,11 +1166,38 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
         // Special gather/conversion for formats without equal component sizes
         if (IsOddFormat((SWR_FORMAT)ied.Format))
         {
-            Value* pResults[4];
-            CreateGatherOddFormats((SWR_FORMAT)ied.Format, pStreamBase, vOffsets, pResults);
+#if USE_SIMD16_GATHERS
+            Value *pResults[4];
+            Value *pResults2[4];
+            CreateGatherOddFormats((SWR_FORMAT)ied.Format, vGatherMask,  pStreamBase, vOffsets,  pResults);
+            CreateGatherOddFormats((SWR_FORMAT)ied.Format, vGatherMask2, pStreamBase, vOffsets2, pResults2);
+            ConvertFormat((SWR_FORMAT)ied.Format, pResults);
+            ConvertFormat((SWR_FORMAT)ied.Format, pResults2);
+
+            for (uint32_t c = 0; c < 4; c += 1)
+            {
+                if (isComponentEnabled(compMask, c))
+                {
+                    // pack adjacent pairs of SIMD8s into SIMD16s
+                    pVtxSrc2[currentVertexElement++] = JOIN_16(pResults[c], pResults2[c]);
+
+                    if (currentVertexElement > 3)
+                    {
+                        // store SIMD16s
+                        Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                        StoreVertexElements16(pVtxOut2, outputElt++, 4, pVtxSrc2);
+                        // reset to the next vVertexElement to output
+                        currentVertexElement = 0;
+                    }
+                }
+            }
+#else
+            Value *pResults[4];
+            CreateGatherOddFormats((SWR_FORMAT)ied.Format, vGatherMask, pStreamBase, vOffsets, pResults);
             ConvertFormat((SWR_FORMAT)ied.Format, pResults);
 
-            for (uint32_t c = 0; c < 4; ++c)
+            for (uint32_t c = 0; c < 4; c += 1)
             {
                 if (isComponentEnabled(compMask, c))
                 {
@@ -816,29 +1210,78 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     }
                 }
             }
+#endif
         }
         else if(info.type[0] == SWR_TYPE_FLOAT)
         {
             ///@todo: support 64 bit vb accesses
-            Value* gatherSrc = VIMMED1(0.0f);
+            Value *gatherSrc = VIMMED1(0.0f);
+#if USE_SIMD16_GATHERS
+            Value *gatherSrc16 = VIMMED1_16(0.0f);
+#endif
 
             SWR_ASSERT(IsUniformFormat((SWR_FORMAT)ied.Format), 
                 "Unsupported format for standard gather fetch.");
 
             // Gather components from memory to store in a simdvertex structure
-            switch(bpc)
+            switch (bpc)
             {
                 case 16:
                 {
-                    Value* vGatherResult[2];
-                    Value *vMask;
+#if USE_SIMD16_GATHERS
+                    Value *gatherResult[2];
 
                     // if we have at least one component out of x or y to fetch
-                    if(isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1)){
-                        // save mask as it is zero'd out after each gather
-                        vMask = vGatherMask;
+                    if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+                    {
+                        gatherResult[0] = GATHERPS_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
 
-                        vGatherResult[0] = GATHERPS(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                        // e.g. result of first 8x32bit integer gather for 16bit components
+                        // 256i - 0    1    2    3    4    5    6    7
+                        //        xyxy xyxy xyxy xyxy xyxy xyxy xyxy xyxy
+                        //
+                    }
+                    else
+                    {
+                        gatherResult[0] = VUNDEF_I_16();
+                    }
+
+                    // if we have at least one component out of z or w to fetch
+                    if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+                    {
+                        // offset base to the next components(zw) in the vertex to gather
+                        pStreamBase = GEP(pStreamBase, C((char)4));
+
+                        gatherResult[1] = GATHERPS_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
+
+                        // e.g. result of second 8x32bit integer gather for 16bit components
+                        // 256i - 0    1    2    3    4    5    6    7
+                        //        zwzw zwzw zwzw zwzw zwzw zwzw zwzw zwzw 
+                        //
+                    }
+                    else
+                    {
+                        gatherResult[1] = VUNDEF_I_16();
+                    }
+
+                    // if we have at least one component to shuffle into place
+                    if (compMask)
+                    {
+                        Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                        Shuffle16bpcArgs args = std::forward_as_tuple(gatherResult, pVtxOut2, Instruction::CastOps::FPExt, CONVERT_NONE,
+                            currentVertexElement, outputElt, compMask, compCtrl, pVtxSrc2);
+
+                        // Shuffle gathered components into place in simdvertex struct
+                        Shuffle16bpcGather16(args);  // outputs to vVertexElements ref
+                    }
+#else
+                    Value *vGatherResult[2];
+
+                    // if we have at least one component out of x or y to fetch
+                    if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+                    {
+                        vGatherResult[0] = GATHERPS(gatherSrc, pStreamBase, vOffsets, vGatherMask);
                         // e.g. result of first 8x32bit integer gather for 16bit components
                         // 256i - 0    1    2    3    4    5    6    7
                         //        xyxy xyxy xyxy xyxy xyxy xyxy xyxy xyxy
@@ -846,12 +1289,12 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     }
 
                     // if we have at least one component out of z or w to fetch
-                    if(isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3)){
+                    if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+                    {
                         // offset base to the next components(zw) in the vertex to gather
                         pStreamBase = GEP(pStreamBase, C((char)4));
-                        vMask = vGatherMask;
 
-                        vGatherResult[1] = GATHERPS(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                        vGatherResult[1] = GATHERPS(gatherSrc, pStreamBase, vOffsets, vGatherMask);
                         // e.g. result of second 8x32bit integer gather for 16bit components
                         // 256i - 0    1    2    3    4    5    6    7
                         //        zwzw zwzw zwzw zwzw zwzw zwzw zwzw zwzw 
@@ -859,33 +1302,78 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     }
 
                     // if we have at least one component to shuffle into place
-                    if(compMask){
+                    if (compMask)
+                    {
                         Shuffle16bpcArgs args = std::forward_as_tuple(vGatherResult, pVtxOut, Instruction::CastOps::FPExt, CONVERT_NONE,
                             currentVertexElement, outputElt, compMask, compCtrl, vVertexElements);
 
                         // Shuffle gathered components into place in simdvertex struct
+#if USE_SIMD16_SHADERS
+                        Shuffle16bpcGather(args, useVertexID2);  // outputs to vVertexElements ref
+#else
                         Shuffle16bpcGather(args);  // outputs to vVertexElements ref
+#endif
                     }
+#endif
                 }
                     break;
                 case 32:
                 {
-                    for (uint32_t i = 0; i < 4; i++)
+                    for (uint32_t i = 0; i < 4; i += 1)
                     {
+#if USE_SIMD16_GATHERS
                         if (isComponentEnabled(compMask, i))
                         {
                             // if we need to gather the component
                             if (compCtrl[i] == StoreSrc)
                             {
-                                // save mask as it is zero'd out after each gather
-                                Value *vMask = vGatherMask;
+                                // Gather a SIMD of vertices
+                                // APIs allow a 4GB range for offsets
+                                // However, GATHERPS uses signed 32-bit offsets, so only a 2GB range :(
+                                // But, we know that elements must be aligned for FETCH. :)
+                                // Right shift the offset by a bit and then scale by 2 to remove the sign extension.
+                                Value *shiftedOffsets16 = LSHR(vOffsets16, 1);
+                                pVtxSrc2[currentVertexElement++] = GATHERPS_16(gatherSrc16, pStreamBase, shiftedOffsets16, vGatherMask16, 2);
+                            }
+                            else
+                            {
+                                pVtxSrc2[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
+                            }
+
+                            if (currentVertexElement > 3)
+                            {
+                                // store SIMD16s
+                                Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                                StoreVertexElements16(pVtxOut2, outputElt++, 4, pVtxSrc2);
+                                // reset to the next vVertexElement to output
+                                currentVertexElement = 0;
+                            }
+                        }
 
+                        // offset base to the next component in the vertex to gather
+                        pStreamBase = GEP(pStreamBase, C((char)4));
+#else
+                        if (isComponentEnabled(compMask, i))
+                        {
+                            // if we need to gather the component
+                            if (compCtrl[i] == StoreSrc)
+                            {
                                 // Gather a SIMD of vertices
-                                vVertexElements[currentVertexElement++] = GATHERPS(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                                // APIs allow a 4GB range for offsets
+                                // However, GATHERPS uses signed 32-bit offsets, so only a 2GB range :(
+                                // But, we know that elements must be aligned for FETCH. :)
+                                // Right shift the offset by a bit and then scale by 2 to remove the sign extension.
+                                Value *vShiftedOffsets = LSHR(vOffsets, 1);
+                                vVertexElements[currentVertexElement++] = GATHERPS(gatherSrc, pStreamBaseGFX, vShiftedOffsets, vGatherMask, 2);
                             }
                             else
                             {
+#if USE_SIMD16_SHADERS
+                                vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
                                 vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
                             }
 
                             if (currentVertexElement > 3)
@@ -894,20 +1382,124 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                                 // reset to the next vVertexElement to output
                                 currentVertexElement = 0;
                             }
-
                         }
 
                         // offset base to the next component in the vertex to gather
                         pStreamBase = GEP(pStreamBase, C((char)4));
+                        pStreamBaseGFX = ADD(pStreamBaseGFX, C((int64_t)4));
+#endif
                     }
                 }
                     break;
-                default:
-                    SWR_ASSERT(0, "Tried to fetch invalid FP format");
-                    break;
-            }
-        }
-        else
+                case 64:
+                {
+                    for (uint32_t i = 0; i < 4; i += 1)
+                    {
+#if USE_SIMD16_GATHERS
+                        if (isComponentEnabled(compMask, i))
+                        {
+                            // if we need to gather the component
+                            if (compCtrl[i] == StoreSrc)
+                            {
+                                Value *vMaskLo  = VSHUFFLE(vGatherMask,  VUNDEF(mInt1Ty, 8), C({ 0, 1, 2, 3 }));
+                                Value *vMaskLo2 = VSHUFFLE(vGatherMask2, VUNDEF(mInt1Ty, 8), C({ 0, 1, 2, 3 }));
+                                Value *vMaskHi  = VSHUFFLE(vGatherMask,  VUNDEF(mInt1Ty, 8), C({ 4, 5, 6, 7 }));
+                                Value *vMaskHi2 = VSHUFFLE(vGatherMask2, VUNDEF(mInt1Ty, 8), C({ 4, 5, 6, 7 }));
+
+                                Value *vOffsetsLo  = VEXTRACTI128(vOffsets,  C(0));
+                                Value *vOffsetsLo2 = VEXTRACTI128(vOffsets2, C(0));
+                                Value *vOffsetsHi  = VEXTRACTI128(vOffsets,  C(1));
+                                Value *vOffsetsHi2 = VEXTRACTI128(vOffsets2, C(1));
+
+                                Value *vZeroDouble = VECTOR_SPLAT(4, ConstantFP::get(IRB()->getDoubleTy(), 0.0f));
+
+                                Value* pGatherLo  = GATHERPD(vZeroDouble, pStreamBase, vOffsetsLo,  vMaskLo);
+                                Value* pGatherLo2 = GATHERPD(vZeroDouble, pStreamBase, vOffsetsLo2, vMaskLo2);
+                                Value* pGatherHi  = GATHERPD(vZeroDouble, pStreamBase, vOffsetsHi,  vMaskHi);
+                                Value* pGatherHi2 = GATHERPD(vZeroDouble, pStreamBase, vOffsetsHi2, vMaskHi2);
+
+                                pGatherLo  = VCVTPD2PS(pGatherLo);
+                                pGatherLo2 = VCVTPD2PS(pGatherLo2);
+                                pGatherHi  = VCVTPD2PS(pGatherHi);
+                                pGatherHi2 = VCVTPD2PS(pGatherHi2);
+
+                                Value *pGather  = VSHUFFLE(pGatherLo,  pGatherHi,  C({ 0, 1, 2, 3, 4, 5, 6, 7 }));
+                                Value *pGather2 = VSHUFFLE(pGatherLo2, pGatherHi2, C({ 0, 1, 2, 3, 4, 5, 6, 7 }));
+
+                                // pack adjacent pairs of SIMD8s into SIMD16s
+                                pVtxSrc2[currentVertexElement++] = JOIN_16(pGather, pGather2);
+                            }
+                            else
+                            {
+                                pVtxSrc2[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
+                            }
+
+                            if (currentVertexElement > 3)
+                            {
+                                // store SIMD16s
+                                Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                                StoreVertexElements16(pVtxOut2, outputElt++, 4, pVtxSrc2);
+                                // reset to the next vVertexElement to output
+                                currentVertexElement = 0;
+                            }
+                        }
+
+                        // offset base to the next component  in the vertex to gather
+                        pStreamBase = GEP(pStreamBase, C((char)8));
+#else
+                        if (isComponentEnabled(compMask, i))
+                        {
+                            // if we need to gather the component
+                            if (compCtrl[i] == StoreSrc)
+                            {
+                                Value *vMaskLo = VSHUFFLE(vGatherMask, VUNDEF(mInt1Ty, 8), C({0, 1, 2, 3}));
+                                Value *vMaskHi = VSHUFFLE(vGatherMask, VUNDEF(mInt1Ty, 8), C({4, 5, 6, 7}));
+
+                                Value *vOffsetsLo = VEXTRACTI128(vOffsets, C(0));
+                                Value *vOffsetsHi = VEXTRACTI128(vOffsets, C(1));
+
+                                Value *vZeroDouble = VECTOR_SPLAT(4, ConstantFP::get(IRB()->getDoubleTy(), 0.0f));
+
+                                Value* pGatherLo = GATHERPD(vZeroDouble, pStreamBase, vOffsetsLo, vMaskLo);
+                                Value* pGatherHi = GATHERPD(vZeroDouble, pStreamBase, vOffsetsHi, vMaskHi);
+
+                                pGatherLo = VCVTPD2PS(pGatherLo);
+                                pGatherHi = VCVTPD2PS(pGatherHi);
+
+                                Value *pGather = VSHUFFLE(pGatherLo, pGatherHi, C({0, 1, 2, 3, 4, 5, 6, 7}));
+
+                                vVertexElements[currentVertexElement++] = pGather;
+                            }
+                            else
+                            {
+#if USE_SIMD16_SHADERS
+                                vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
+                                vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
+                            }
+
+                            if (currentVertexElement > 3)
+                            {
+                                StoreVertexElements(pVtxOut, outputElt++, 4, vVertexElements);
+                                // reset to the next vVertexElement to output
+                                currentVertexElement = 0;
+                            }
+                        }
+
+                        // offset base to the next component  in the vertex to gather
+                        pStreamBase = GEP(pStreamBase, C((char)8));
+#endif
+                    }
+                }
+                    break;
+                default:
+                    SWR_INVALID("Tried to fetch invalid FP format");
+                    break;
+            }
+        }
+        else
         {
             Instruction::CastOps extendCastType = Instruction::CastOps::CastOpsEnd;
             ConversionType conversionType = CONVERT_NONE;
@@ -935,12 +1527,19 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     conversionType = CONVERT_SSCALED;
                     extendCastType = Instruction::CastOps::SIToFP;
                     break;
+                case SWR_TYPE_SFIXED:
+                    conversionType = CONVERT_SFIXED;
+                    extendCastType = Instruction::CastOps::SExt;
+                    break;
                 default:
                     break;
             }
 
             // value substituted when component of gather is masked
             Value* gatherSrc = VIMMED1(0);
+#if USE_SIMD16_GATHERS
+            Value *gatherSrc16 = VIMMED1_16(0);
+#endif
 
             // Gather components from memory to store in a simdvertex structure
             switch (bpc)
@@ -948,9 +1547,24 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                 case 8:
                 {
                     // if we have at least one component to fetch
-                    if(compMask)
+                    if (compMask)
                     {
-                        Value* vGatherResult = GATHERDD(gatherSrc, pStreamBase, vOffsets, vGatherMask, C((char)1));
+#if USE_SIMD16_GATHERS
+                        Value *gatherResult = GATHERDD_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
+
+                        // e.g. result of an 8x32bit integer gather for 8bit components
+                        // 256i - 0    1    2    3    4    5    6    7
+                        //        xyzw xyzw xyzw xyzw xyzw xyzw xyzw xyzw 
+
+                        Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                        Shuffle8bpcArgs args = std::forward_as_tuple(gatherResult, pVtxOut2, extendCastType, conversionType,
+                            currentVertexElement, outputElt, compMask, compCtrl, pVtxSrc2, info.swizzle);
+
+                        // Shuffle gathered components into place in simdvertex struct
+                        Shuffle8bpcGatherd16(args);  // outputs to vVertexElements ref
+#else
+                        Value *vGatherResult = GATHERDD(gatherSrc, pStreamBase, vOffsets, vGatherMask);
                         // e.g. result of an 8x32bit integer gather for 8bit components
                         // 256i - 0    1    2    3    4    5    6    7
                         //        xyzw xyzw xyzw xyzw xyzw xyzw xyzw xyzw 
@@ -959,21 +1573,71 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                             currentVertexElement, outputElt, compMask, compCtrl, vVertexElements, info.swizzle);
 
                         // Shuffle gathered components into place in simdvertex struct
+#if USE_SIMD16_SHADERS
+                        Shuffle8bpcGatherd(args, useVertexID2); // outputs to vVertexElements ref
+#else
                         Shuffle8bpcGatherd(args); // outputs to vVertexElements ref
+#endif
+#endif
                     }
                 }
                 break;
                 case 16:
                 {
-                    Value* vGatherResult[2];
-                    Value *vMask;
+#if USE_SIMD16_GATHERS
+                    Value *gatherResult[2];
 
                     // if we have at least one component out of x or y to fetch
-                    if(isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1)){
-                        // save mask as it is zero'd out after each gather
-                        vMask = vGatherMask;
+                    if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+                    {
+                        gatherResult[0] = GATHERDD_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
+
+                        // e.g. result of first 8x32bit integer gather for 16bit components
+                        // 256i - 0    1    2    3    4    5    6    7
+                        //        xyxy xyxy xyxy xyxy xyxy xyxy xyxy xyxy
+                        //
+                    }
+                    else
+                    {
+                        gatherResult[0] = VUNDEF_I_16();
+                    }
 
-                        vGatherResult[0] = GATHERDD(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                    // if we have at least one component out of z or w to fetch
+                    if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+                    {
+                        // offset base to the next components(zw) in the vertex to gather
+                        pStreamBase = GEP(pStreamBase, C((char)4));
+
+                        gatherResult[1] = GATHERDD_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
+
+                        // e.g. result of second 8x32bit integer gather for 16bit components
+                        // 256i - 0    1    2    3    4    5    6    7
+                        //        zwzw zwzw zwzw zwzw zwzw zwzw zwzw zwzw 
+                        //
+                    }
+                    else
+                    {
+                        gatherResult[1] = VUNDEF_I_16();
+                    }
+
+                    // if we have at least one component to shuffle into place
+                    if (compMask)
+                    {
+                        Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                        Shuffle16bpcArgs args = std::forward_as_tuple(gatherResult, pVtxOut2, extendCastType, conversionType,
+                            currentVertexElement, outputElt, compMask, compCtrl, pVtxSrc2);
+
+                        // Shuffle gathered components into place in simdvertex struct
+                        Shuffle16bpcGather16(args);  // outputs to vVertexElements ref
+                    }
+#else
+                    Value *vGatherResult[2];
+
+                    // if we have at least one component out of x or y to fetch
+                    if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+                    {
+                        vGatherResult[0] = GATHERDD(gatherSrc, pStreamBase, vOffsets, vGatherMask);
                         // e.g. result of first 8x32bit integer gather for 16bit components
                         // 256i - 0    1    2    3    4    5    6    7
                         //        xyxy xyxy xyxy xyxy xyxy xyxy xyxy xyxy
@@ -981,12 +1645,12 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     }
 
                     // if we have at least one component out of z or w to fetch
-                    if(isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3)){
+                    if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+                    {
                         // offset base to the next components(zw) in the vertex to gather
                         pStreamBase = GEP(pStreamBase, C((char)4));
-                        vMask = vGatherMask;
 
-                        vGatherResult[1] = GATHERDD(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                        vGatherResult[1] = GATHERDD(gatherSrc, pStreamBase, vOffsets, vGatherMask);
                         // e.g. result of second 8x32bit integer gather for 16bit components
                         // 256i - 0    1    2    3    4    5    6    7
                         //        zwzw zwzw zwzw zwzw zwzw zwzw zwzw zwzw 
@@ -994,19 +1658,23 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                     }
 
                     // if we have at least one component to shuffle into place
-                    if(compMask){
+                    if (compMask)
+                    {
                         Shuffle16bpcArgs args = std::forward_as_tuple(vGatherResult, pVtxOut, extendCastType, conversionType,
                             currentVertexElement, outputElt, compMask, compCtrl, vVertexElements);
 
                         // Shuffle gathered components into place in simdvertex struct
+#if USE_SIMD16_SHADERS
+                        Shuffle16bpcGather(args, useVertexID2);  // outputs to vVertexElements ref
+#else
                         Shuffle16bpcGather(args);  // outputs to vVertexElements ref
+#endif
                     }
+#endif
                 }
                 break;
                 case 32:
                 {
-                    SWR_ASSERT(conversionType == CONVERT_NONE);
-
                     // Gathered components into place in simdvertex struct
                     for (uint32_t i = 0; i < 4; i++)
                     {
@@ -1015,23 +1683,74 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
                             // if we need to gather the component
                             if (compCtrl[i] == StoreSrc)
                             {
-                                // save mask as it is zero'd out after each gather
-                                Value *vMask = vGatherMask;
+#if USE_SIMD16_GATHERS
+                                Value *pGather = GATHERDD_16(gatherSrc16, pStreamBase, vOffsets16, vGatherMask16);
+
+                                if (conversionType == CONVERT_USCALED)
+                                {
+                                    pGather = UI_TO_FP(pGather, mSimd16FP32Ty);
+                                }
+                                else if (conversionType == CONVERT_SSCALED)
+                                {
+                                    pGather = SI_TO_FP(pGather, mSimd16FP32Ty);
+                                }
+                                else if (conversionType == CONVERT_SFIXED)
+                                {
+                                    pGather = FMUL(SI_TO_FP(pGather, mSimd16FP32Ty), VBROADCAST_16(C(1 / 65536.0f)));
+                                }
+
+                                pVtxSrc2[currentVertexElement++] = pGather;
 
-                                vVertexElements[currentVertexElement++] = GATHERDD(gatherSrc, pStreamBase, vOffsets, vMask, C((char)1));
+                                // e.g. result of a single 8x32bit integer gather for 32bit components
+                                // 256i - 0    1    2    3    4    5    6    7
+                                //        xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx 
+#else
+                                Value* pGather = GATHERDD(gatherSrc, pStreamBase, vOffsets, vGatherMask);
+
+                                if (conversionType == CONVERT_USCALED)
+                                {
+                                    pGather = UI_TO_FP(pGather, mSimdFP32Ty);
+                                }
+                                else if (conversionType == CONVERT_SSCALED)
+                                {
+                                    pGather = SI_TO_FP(pGather, mSimdFP32Ty);
+                                }
+                                else if (conversionType == CONVERT_SFIXED)
+                                {
+                                    pGather = FMUL(SI_TO_FP(pGather, mSimdFP32Ty), VBROADCAST(C(1/65536.0f)));
+                                }
+
+                                vVertexElements[currentVertexElement++] = pGather;
 
                                 // e.g. result of a single 8x32bit integer gather for 32bit components
                                 // 256i - 0    1    2    3    4    5    6    7
                                 //        xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx 
+#endif
                             }
                             else
                             {
+#if USE_SIMD16_GATHERS
+                                pVtxSrc2[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
+#else
+#if USE_SIMD16_SHADERS
+                                vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
                                 vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
+#endif
                             }
 
                             if (currentVertexElement > 3)
                             {
+#if USE_SIMD16_GATHERS
+                                // store SIMD16s
+                                Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+                                StoreVertexElements16(pVtxOut2, outputElt++, 4, pVtxSrc2);
+#else
                                 StoreVertexElements(pVtxOut, outputElt++, 4, vVertexElements);
+#endif
+
                                 // reset to the next vVertexElement to output
                                 currentVertexElement = 0;
                             }
@@ -1048,8 +1767,16 @@ void FetchJit::JitGatherVertices(const FETCH_COMPILE_STATE &fetchState, Value* f
     }
 
     // if we have a partially filled vVertexElement struct, output it
-    if(currentVertexElement > 0){
+    if (currentVertexElement > 0)
+    {
+#if USE_SIMD16_GATHERS
+        // store SIMD16s
+        Value *pVtxOut2 = BITCAST(pVtxOut, PointerType::get(VectorType::get(mFP32Ty, mVWidth16), 0));
+
+        StoreVertexElements16(pVtxOut2, outputElt++, currentVertexElement, pVtxSrc2);
+#else
         StoreVertexElements(pVtxOut, outputElt++, currentVertexElement, vVertexElements);
+#endif
     }
 }
 
@@ -1174,7 +1901,8 @@ Value* FetchJit::GetSimdValid32bitIndices(Value* pIndices, Value* pLastIndex)
 ///   @param compCtrl - component control val
 ///   @param vVertexElements[4] - vertex components to output
 ///   @param swizzle[4] - component swizzle location
-void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
+#if USE_SIMD16_GATHERS
+void FetchJit::Shuffle8bpcGatherd16(Shuffle8bpcArgs &args)
 {
     // Unpack tuple args
     Value*& vGatherResult = std::get<0>(args);
@@ -1182,55 +1910,70 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
     const Instruction::CastOps extendType = std::get<2>(args);
     const ConversionType conversionType = std::get<3>(args);
     uint32_t &currentVertexElement = std::get<4>(args);
-    uint32_t &outputElt =  std::get<5>(args);
+    uint32_t &outputElt = std::get<5>(args);
     const ComponentEnable compMask = std::get<6>(args);
-    const ComponentControl (&compCtrl)[4] = std::get<7>(args);
+    const ComponentControl(&compCtrl)[4] = std::get<7>(args);
     Value* (&vVertexElements)[4] = std::get<8>(args);
-    const uint32_t (&swizzle)[4] = std::get<9>(args);
+    const uint32_t(&swizzle)[4] = std::get<9>(args);
 
     // cast types
-    TypevGatherTy = mSimdInt32Ty;
-    Type* v32x8Ty =  VectorType::get(mInt8Ty, mVWidth * 4 ); // vwidth is units of 32 bits
+    Type *vGatherTy = mSimdInt32Ty;
+    Type *v32x8Ty = VectorType::get(mInt8Ty, mVWidth * 4); // vwidth is units of 32 bits
 
     // have to do extra work for sign extending
-    if ((extendType == Instruction::CastOps::SExt) || (extendType == Instruction::CastOps::SIToFP)){
-        Type* v16x8Ty = VectorType::get(mInt8Ty, mVWidth * 2); // 8x16bit ints in a 128bit lane
-        Type* v128Ty = VectorType::get(IntegerType::getIntNTy(JM()->mContext, 128), mVWidth / 4); // vwidth is units of 32 bits
+    if ((extendType == Instruction::CastOps::SExt) || (extendType == Instruction::CastOps::SIToFP))
+    {
+        Type *v16x8Ty = VectorType::get(mInt8Ty, mVWidth * 2); // 8x16bit ints in a 128bit lane
+        Type *v128Ty = VectorType::get(IntegerType::getIntNTy(JM()->mContext, 128), mVWidth / 4); // vwidth is units of 32 bits
 
         // shuffle mask, including any swizzling
         const char x = (char)swizzle[0]; const char y = (char)swizzle[1];
         const char z = (char)swizzle[2]; const char w = (char)swizzle[3];
-        Value* vConstMask = C<char>({char(x), char(x+4), char(x+8), char(x+12),
-                    char(y), char(y+4), char(y+8), char(y+12),
-                    char(z), char(z+4), char(z+8), char(z+12),
-                    char(w), char(w+4), char(w+8), char(w+12),
-                    char(x), char(x+4), char(x+8), char(x+12),
-                    char(y), char(y+4), char(y+8), char(y+12),
-                    char(z), char(z+4), char(z+8), char(z+12),
-                    char(w), char(w+4), char(w+8), char(w+12)});
-
-        Value* vShufResult = BITCAST(PSHUFB(BITCAST(vGatherResult, v32x8Ty), vConstMask), vGatherTy);
+        Value *vConstMask = C<char>({ char(x), char(x + 4), char(x + 8), char(x + 12),
+            char(y), char(y + 4), char(y + 8), char(y + 12),
+            char(z), char(z + 4), char(z + 8), char(z + 12),
+            char(w), char(w + 4), char(w + 8), char(w + 12),
+            char(x), char(x + 4), char(x + 8), char(x + 12),
+            char(y), char(y + 4), char(y + 8), char(y + 12),
+            char(z), char(z + 4), char(z + 8), char(z + 12),
+            char(w), char(w + 4), char(w + 8), char(w + 12) });
+
+        // SIMD16 PSHUFB isnt part of AVX-512F, so split into SIMD8 for the sake of KNL, for now..
+
+        Value *vGatherResult_lo = EXTRACT_16(vGatherResult, 0);
+        Value *vGatherResult_hi = EXTRACT_16(vGatherResult, 1);
+
+        Value *vShufResult_lo = BITCAST(PSHUFB(BITCAST(vGatherResult_lo, v32x8Ty), vConstMask), vGatherTy);
+        Value *vShufResult_hi = BITCAST(PSHUFB(BITCAST(vGatherResult_hi, v32x8Ty), vConstMask), vGatherTy);
+
         // after pshufb: group components together in each 128bit lane
         // 256i - 0    1    2    3    4    5    6    7
         //        xxxx yyyy zzzz wwww xxxx yyyy zzzz wwww
 
-        Value* vi128XY = nullptr;
-        if(isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1)){
-            vi128XY = BITCAST(PERMD(vShufResult, C<int32_t>({0, 4, 0, 0, 1, 5, 0, 0})), v128Ty);
+        Value *vi128XY_lo = nullptr;
+        Value *vi128XY_hi = nullptr;
+        if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+        {
+            vi128XY_lo = BITCAST(PERMD(vShufResult_lo, C<int32_t>({ 0, 4, 0, 0, 1, 5, 0, 0 })), v128Ty);
+            vi128XY_hi = BITCAST(PERMD(vShufResult_hi, C<int32_t>({ 0, 4, 0, 0, 1, 5, 0, 0 })), v128Ty);
+
             // after PERMD: move and pack xy and zw components in low 64 bits of each 128bit lane
             // 256i - 0    1    2    3    4    5    6    7
             //        xxxx xxxx dcdc dcdc yyyy yyyy dcdc dcdc (dc - don't care)
         }
 
         // do the same for zw components
-        Value* vi128ZW = nullptr;
-        if(isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3)){
-            vi128ZW = BITCAST(PERMD(vShufResult, C<int32_t>({2, 6, 0, 0, 3, 7, 0, 0})), v128Ty);
+        Value *vi128ZW_lo = nullptr;
+        Value *vi128ZW_hi = nullptr;
+        if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+        {
+            vi128ZW_lo = BITCAST(PERMD(vShufResult_lo, C<int32_t>({ 2, 6, 0, 0, 3, 7, 0, 0 })), v128Ty);
+            vi128ZW_hi = BITCAST(PERMD(vShufResult_hi, C<int32_t>({ 2, 6, 0, 0, 3, 7, 0, 0 })), v128Ty);
         }
 
         // init denormalize variables if needed
         Instruction::CastOps fpCast;
-        ValueconversionFactor;
+        Value *conversionFactor;
 
         switch (conversionType)
         {
@@ -1243,7 +1986,7 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
             conversionFactor = VIMMED1((float)(1.0));
             break;
         case CONVERT_USCALED:
-            SWR_ASSERT(0, "Type should not be sign extended!");
+            SWR_INVALID("Type should not be sign extended!");
             conversionFactor = nullptr;
             break;
         default:
@@ -1262,26 +2005,32 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
                     // if x or z, extract 128bits from lane 0, else for y or w, extract from lane 1
                     uint32_t lane = ((i == 0) || (i == 2)) ? 0 : 1;
                     // if x or y, use vi128XY permute result, else use vi128ZW
-                    Value* selectedPermute = (i < 2) ? vi128XY : vi128ZW;
+                    Value *selectedPermute_lo = (i < 2) ? vi128XY_lo : vi128ZW_lo;
+                    Value *selectedPermute_hi = (i < 2) ? vi128XY_hi : vi128ZW_hi;
 
                     // sign extend
-                    vVertexElements[currentVertexElement] = PMOVSXBD(BITCAST(VEXTRACT(selectedPermute, C(lane)), v16x8Ty));
+                    Value *temp_lo = PMOVSXBD(BITCAST(VEXTRACT(selectedPermute_lo, C(lane)), v16x8Ty));
+                    Value *temp_hi = PMOVSXBD(BITCAST(VEXTRACT(selectedPermute_hi, C(lane)), v16x8Ty));
 
                     // denormalize if needed
                     if (conversionType != CONVERT_NONE)
                     {
-                        vVertexElements[currentVertexElement] = FMUL(CAST(fpCast, vVertexElements[currentVertexElement], mSimdFP32Ty), conversionFactor);
+                        temp_lo = FMUL(CAST(fpCast, temp_lo, mSimdFP32Ty), conversionFactor);
+                        temp_hi = FMUL(CAST(fpCast, temp_hi, mSimdFP32Ty), conversionFactor);
                     }
-                    currentVertexElement++;
+
+                    vVertexElements[currentVertexElement] = JOIN_16(temp_lo, temp_hi);
+
+                    currentVertexElement += 1;
                 }
                 else
                 {
-                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
                 }
 
                 if (currentVertexElement > 3)
                 {
-                    StoreVertexElements(pVtxOut, outputElt++, 4, vVertexElements);
+                    StoreVertexElements16(pVtxOut, outputElt++, 4, vVertexElements);
                     // reset to the next vVertexElement to output
                     currentVertexElement = 0;
                 }
@@ -1293,7 +2042,7 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
     {
         // init denormalize variables if needed
         Instruction::CastOps fpCast;
-        ValueconversionFactor;
+        Value *conversionFactor;
 
         switch (conversionType)
         {
@@ -1306,7 +2055,7 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
             conversionFactor = VIMMED1((float)(1.0));
             break;
         case CONVERT_SSCALED:
-            SWR_ASSERT(0, "Type should not be zero extended!");
+            SWR_INVALID("Type should not be zero extended!");
             conversionFactor = nullptr;
             break;
         default:
@@ -1323,35 +2072,40 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
                 if (compCtrl[i] == ComponentControl::StoreSrc)
                 {
                     // pshufb masks for each component
-                    ValuevConstMask;
+                    Value *vConstMask;
                     switch (swizzle[i])
                     {
                     case 0:
                         // x shuffle mask
                         vConstMask = C<char>({ 0, -1, -1, -1, 4, -1, -1, -1, 8, -1, -1, -1, 12, -1, -1, -1,
-                                               0, -1, -1, -1, 4, -1, -1, -1, 8, -1, -1, -1, 12, -1, -1, -1 });
+                            0, -1, -1, -1, 4, -1, -1, -1, 8, -1, -1, -1, 12, -1, -1, -1 });
                         break;
                     case 1:
                         // y shuffle mask
                         vConstMask = C<char>({ 1, -1, -1, -1, 5, -1, -1, -1, 9, -1, -1, -1, 13, -1, -1, -1,
-                                               1, -1, -1, -1, 5, -1, -1, -1, 9, -1, -1, -1, 13, -1, -1, -1 });
+                            1, -1, -1, -1, 5, -1, -1, -1, 9, -1, -1, -1, 13, -1, -1, -1 });
                         break;
                     case 2:
                         // z shuffle mask
                         vConstMask = C<char>({ 2, -1, -1, -1, 6, -1, -1, -1, 10, -1, -1, -1, 14, -1, -1, -1,
-                                               2, -1, -1, -1, 6, -1, -1, -1, 10, -1, -1, -1, 14, -1, -1, -1 });
+                            2, -1, -1, -1, 6, -1, -1, -1, 10, -1, -1, -1, 14, -1, -1, -1 });
                         break;
                     case 3:
                         // w shuffle mask
                         vConstMask = C<char>({ 3, -1, -1, -1, 7, -1, -1, -1, 11, -1, -1, -1, 15, -1, -1, -1,
-                                               3, -1, -1, -1, 7, -1, -1, -1, 11, -1, -1, -1, 15, -1, -1, -1 });
+                            3, -1, -1, -1, 7, -1, -1, -1, 11, -1, -1, -1, 15, -1, -1, -1 });
                         break;
                     default:
                         vConstMask = nullptr;
                         break;
                     }
 
-                    vVertexElements[currentVertexElement] = BITCAST(PSHUFB(BITCAST(vGatherResult, v32x8Ty), vConstMask), vGatherTy);
+                    Value *vGatherResult_lo = EXTRACT_16(vGatherResult, 0);
+                    Value *vGatherResult_hi = EXTRACT_16(vGatherResult, 1);
+
+                    Value *temp_lo = BITCAST(PSHUFB(BITCAST(vGatherResult_lo, v32x8Ty), vConstMask), vGatherTy);
+                    Value *temp_hi = BITCAST(PSHUFB(BITCAST(vGatherResult_hi, v32x8Ty), vConstMask), vGatherTy);
+
                     // after pshufb for x channel
                     // 256i - 0    1    2    3    4    5    6    7
                     //        x000 x000 x000 x000 x000 x000 x000 x000 
@@ -1359,18 +2113,22 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
                     // denormalize if needed
                     if (conversionType != CONVERT_NONE)
                     {
-                        vVertexElements[currentVertexElement] = FMUL(CAST(fpCast, vVertexElements[currentVertexElement], mSimdFP32Ty), conversionFactor);
+                        temp_lo = FMUL(CAST(fpCast, temp_lo, mSimdFP32Ty), conversionFactor);
+                        temp_hi = FMUL(CAST(fpCast, temp_hi, mSimdFP32Ty), conversionFactor);
                     }
-                    currentVertexElement++;
+
+                    vVertexElements[currentVertexElement] = JOIN_16(temp_lo, temp_hi);
+
+                    currentVertexElement += 1;
                 }
                 else
                 {
-                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
                 }
 
                 if (currentVertexElement > 3)
                 {
-                    StoreVertexElements(pVtxOut, outputElt++, 4, vVertexElements);
+                    StoreVertexElements16(pVtxOut, outputElt++, 4, vVertexElements);
                     // reset to the next vVertexElement to output
                     currentVertexElement = 0;
                 }
@@ -1379,10 +2137,114 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
     }
     else
     {
-        SWR_ASSERT(0, "Unsupported conversion type");
+        SWR_INVALID("Unsupported conversion type");
     }
 }
 
+#else
+#if USE_SIMD16_SHADERS
+void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args, bool useVertexID2)
+#else
+void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
+#endif
+{
+    // Unpack tuple args
+    Value*& vGatherResult = std::get<0>(args);
+    Value* pVtxOut = std::get<1>(args);
+    const Instruction::CastOps extendType = std::get<2>(args);
+    const ConversionType conversionType = std::get<3>(args);
+    uint32_t &currentVertexElement = std::get<4>(args);
+    uint32_t &outputElt = std::get<5>(args);
+    const ComponentEnable compMask = std::get<6>(args);
+    const ComponentControl(&compCtrl)[4] = std::get<7>(args);
+    Value* (&vVertexElements)[4] = std::get<8>(args);
+    const uint32_t(&swizzle)[4] = std::get<9>(args);
+
+    // cast types
+    Type* v32x8Ty = VectorType::get(mInt8Ty, mVWidth * 4); // vwidth is units of 32 bits
+
+    for (uint32_t i = 0; i < 4; i++)
+    {
+        if (!isComponentEnabled(compMask, i))
+            continue;
+
+        if (compCtrl[i] == ComponentControl::StoreSrc)
+        {
+            std::vector<uint32_t> vShuffleMasks[4] = {
+                { 0, 4,  8, 12, 16, 20, 24, 28 }, // x
+                { 1, 5,  9, 13, 17, 21, 25, 29 }, // y
+                { 2, 6, 10, 14, 18, 22, 26, 30 }, // z
+                { 3, 7, 11, 15, 19, 23, 27, 31 }, // w
+            };
+
+            Value *val = VSHUFFLE(BITCAST(vGatherResult, v32x8Ty),
+                UndefValue::get(v32x8Ty),
+                vShuffleMasks[swizzle[i]]);
+
+            if ((extendType == Instruction::CastOps::SExt) ||
+                (extendType == Instruction::CastOps::SIToFP)) {
+                switch (conversionType)
+                {
+                case CONVERT_NORMALIZED:
+                    val = FMUL(SI_TO_FP(val, mSimdFP32Ty), VIMMED1((float)(1.0 / 127.0)));
+                    break;
+                case CONVERT_SSCALED:
+                    val = SI_TO_FP(val, mSimdFP32Ty);
+                    break;
+                case CONVERT_USCALED:
+                    SWR_INVALID("Type should not be sign extended!");
+                    break;
+                default:
+                    SWR_ASSERT(conversionType == CONVERT_NONE);
+                    val = S_EXT(val, mSimdInt32Ty);
+                    break;
+                }
+            }
+            else if ((extendType == Instruction::CastOps::ZExt) ||
+                (extendType == Instruction::CastOps::UIToFP)) {
+                switch (conversionType)
+                {
+                case CONVERT_NORMALIZED:
+                    val = FMUL(UI_TO_FP(val, mSimdFP32Ty), VIMMED1((float)(1.0 / 255.0)));
+                    break;
+                case CONVERT_SSCALED:
+                    SWR_INVALID("Type should not be zero extended!");
+                    break;
+                case CONVERT_USCALED:
+                    val = UI_TO_FP(val, mSimdFP32Ty);
+                    break;
+                default:
+                    SWR_ASSERT(conversionType == CONVERT_NONE);
+                    val = Z_EXT(val, mSimdInt32Ty);
+                    break;
+                }
+            }
+            else
+            {
+                SWR_INVALID("Unsupported conversion type");
+            }
+
+            vVertexElements[currentVertexElement++] = val;
+        }
+        else
+        {
+#if USE_SIMD16_SHADERS
+            vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
+            vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
+        }
+
+        if (currentVertexElement > 3)
+        {
+            StoreVertexElements(pVtxOut, outputElt++, 4, vVertexElements);
+            // reset to the next vVertexElement to output
+            currentVertexElement = 0;
+        }
+    }
+}
+
+#endif
 //////////////////////////////////////////////////////////////////////////
 /// @brief Takes a SIMD of gathered 16bpc verts, zero or sign extends, 
 /// denormalizes if needed, converts to F32 if needed, and positions in 
@@ -1397,7 +2259,257 @@ void FetchJit::Shuffle8bpcGatherd(Shuffle8bpcArgs &args)
 ///   @param compMask - component packing mask
 ///   @param compCtrl - component control val
 ///   @param vVertexElements[4] - vertex components to output
+#if USE_SIMD16_GATHERS
+void FetchJit::Shuffle16bpcGather16(Shuffle16bpcArgs &args)
+{
+    // Unpack tuple args
+    Value* (&vGatherResult)[2] = std::get<0>(args);
+    Value* pVtxOut = std::get<1>(args);
+    const Instruction::CastOps extendType = std::get<2>(args);
+    const ConversionType conversionType = std::get<3>(args);
+    uint32_t &currentVertexElement = std::get<4>(args);
+    uint32_t &outputElt = std::get<5>(args);
+    const ComponentEnable compMask = std::get<6>(args);
+    const ComponentControl(&compCtrl)[4] = std::get<7>(args);
+    Value* (&vVertexElements)[4] = std::get<8>(args);
+
+    // cast types
+    Type *vGatherTy = VectorType::get(IntegerType::getInt32Ty(JM()->mContext), mVWidth);
+    Type *v32x8Ty = VectorType::get(mInt8Ty, mVWidth * 4); // vwidth is units of 32 bits
+
+    // have to do extra work for sign extending
+    if ((extendType == Instruction::CastOps::SExt) || (extendType == Instruction::CastOps::SIToFP) || (extendType == Instruction::CastOps::FPExt))
+    {
+        // is this PP float?
+        bool bFP = (extendType == Instruction::CastOps::FPExt) ? true : false;
+
+        Type *v8x16Ty = VectorType::get(mInt16Ty, 8); // 8x16bit in a 128bit lane
+        Type *v128bitTy = VectorType::get(IntegerType::getIntNTy(JM()->mContext, 128), mVWidth / 4); // vwidth is units of 32 bits
+
+        // shuffle mask
+        Value *vConstMask = C<char>({ 0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15,
+                                      0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15 });
+        Value *vi128XY_lo = nullptr;
+        Value *vi128XY_hi = nullptr;
+        if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1))
+        {
+            // SIMD16 PSHUFB isnt part of AVX-512F, so split into SIMD8 for the sake of KNL, for now..
+
+            Value *vGatherResult_lo = EXTRACT_16(vGatherResult[0], 0);
+            Value *vGatherResult_hi = EXTRACT_16(vGatherResult[0], 1);
+
+            Value *vShufResult_lo = BITCAST(PSHUFB(BITCAST(vGatherResult_lo, v32x8Ty), vConstMask), vGatherTy);
+            Value *vShufResult_hi = BITCAST(PSHUFB(BITCAST(vGatherResult_hi, v32x8Ty), vConstMask), vGatherTy);
+
+            // after pshufb: group components together in each 128bit lane
+            // 256i - 0    1    2    3    4    5    6    7
+            //        xxxx xxxx yyyy yyyy xxxx xxxx yyyy yyyy
+
+            vi128XY_lo = BITCAST(PERMD(vShufResult_lo, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
+            vi128XY_hi = BITCAST(PERMD(vShufResult_hi, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
+
+            // after PERMD: move and pack xy components into each 128bit lane
+            // 256i - 0    1    2    3    4    5    6    7
+            //        xxxx xxxx xxxx xxxx yyyy yyyy yyyy yyyy
+        }
+
+        // do the same for zw components
+        Value *vi128ZW_lo = nullptr;
+        Value *vi128ZW_hi = nullptr;
+        if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3))
+        {
+            Value *vGatherResult_lo = EXTRACT_16(vGatherResult[1], 0);
+            Value *vGatherResult_hi = EXTRACT_16(vGatherResult[1], 1);
+
+            Value *vShufResult_lo = BITCAST(PSHUFB(BITCAST(vGatherResult_lo, v32x8Ty), vConstMask), vGatherTy);
+            Value *vShufResult_hi = BITCAST(PSHUFB(BITCAST(vGatherResult_hi, v32x8Ty), vConstMask), vGatherTy);
+
+            vi128ZW_lo = BITCAST(PERMD(vShufResult_lo, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
+            vi128ZW_hi = BITCAST(PERMD(vShufResult_hi, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
+        }
+
+        // init denormalize variables if needed
+        Instruction::CastOps IntToFpCast;
+        Value *conversionFactor;
+
+        switch (conversionType)
+        {
+        case CONVERT_NORMALIZED:
+            IntToFpCast = Instruction::CastOps::SIToFP;
+            conversionFactor = VIMMED1((float)(1.0 / 32767.0));
+            break;
+        case CONVERT_SSCALED:
+            IntToFpCast = Instruction::CastOps::SIToFP;
+            conversionFactor = VIMMED1((float)(1.0));
+            break;
+        case CONVERT_USCALED:
+            SWR_INVALID("Type should not be sign extended!");
+            conversionFactor = nullptr;
+            break;
+        default:
+            SWR_ASSERT(conversionType == CONVERT_NONE);
+            conversionFactor = nullptr;
+            break;
+        }
+
+        // sign extend all enabled components. If we have a fill vVertexElements, output to current simdvertex
+        for (uint32_t i = 0; i < 4; i++)
+        {
+            if (isComponentEnabled(compMask, i))
+            {
+                if (compCtrl[i] == ComponentControl::StoreSrc)
+                {
+                    // if x or z, extract 128bits from lane 0, else for y or w, extract from lane 1
+                    uint32_t lane = ((i == 0) || (i == 2)) ? 0 : 1;
+                    // if x or y, use vi128XY permute result, else use vi128ZW
+                    Value *selectedPermute_lo = (i < 2) ? vi128XY_lo : vi128ZW_lo;
+                    Value *selectedPermute_hi = (i < 2) ? vi128XY_hi : vi128ZW_hi;
+
+                    if (bFP)
+                    {
+                        // extract 128 bit lanes to sign extend each component
+                        Value *temp_lo = CVTPH2PS(BITCAST(VEXTRACT(selectedPermute_lo, C(lane)), v8x16Ty));
+                        Value *temp_hi = CVTPH2PS(BITCAST(VEXTRACT(selectedPermute_hi, C(lane)), v8x16Ty));
+
+                        vVertexElements[currentVertexElement] = JOIN_16(temp_lo, temp_hi);
+                    }
+                    else
+                    {
+                        // extract 128 bit lanes to sign extend each component
+                        Value *temp_lo = PMOVSXWD(BITCAST(VEXTRACT(selectedPermute_lo, C(lane)), v8x16Ty));
+                        Value *temp_hi = PMOVSXWD(BITCAST(VEXTRACT(selectedPermute_hi, C(lane)), v8x16Ty));
+
+                        // denormalize if needed
+                        if (conversionType != CONVERT_NONE)
+                        {
+                            temp_lo = FMUL(CAST(IntToFpCast, temp_lo, mSimdFP32Ty), conversionFactor);
+                            temp_hi = FMUL(CAST(IntToFpCast, temp_hi, mSimdFP32Ty), conversionFactor);
+                        }
+
+                        vVertexElements[currentVertexElement] = JOIN_16(temp_lo, temp_hi);
+                    }
+
+                    currentVertexElement += 1;
+                }
+                else
+                {
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
+                }
+
+                if (currentVertexElement > 3)
+                {
+                    StoreVertexElements16(pVtxOut, outputElt++, 4, vVertexElements);
+                    // reset to the next vVertexElement to output
+                    currentVertexElement = 0;
+                }
+            }
+        }
+    }
+    // else zero extend
+    else if ((extendType == Instruction::CastOps::ZExt) || (extendType == Instruction::CastOps::UIToFP))
+    {
+        // pshufb masks for each component
+        Value *vConstMask[2];
+
+        if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 2))
+        {
+            // x/z shuffle mask
+            vConstMask[0] = C<char>({ 0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1,
+                0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1, });
+        }
+
+        if (isComponentEnabled(compMask, 1) || isComponentEnabled(compMask, 3))
+        {
+            // y/w shuffle mask
+            vConstMask[1] = C<char>({ 2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1,
+                2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1 });
+        }
+
+        // init denormalize variables if needed
+        Instruction::CastOps fpCast;
+        Value* conversionFactor;
+
+        switch (conversionType)
+        {
+        case CONVERT_NORMALIZED:
+            fpCast = Instruction::CastOps::UIToFP;
+            conversionFactor = VIMMED1((float)(1.0 / 65535.0));
+            break;
+        case CONVERT_USCALED:
+            fpCast = Instruction::CastOps::UIToFP;
+            conversionFactor = VIMMED1((float)(1.0f));
+            break;
+        case CONVERT_SSCALED:
+            SWR_INVALID("Type should not be zero extended!");
+            conversionFactor = nullptr;
+            break;
+        default:
+            SWR_ASSERT(conversionType == CONVERT_NONE);
+            conversionFactor = nullptr;
+            break;
+        }
+
+        // shuffle enabled components into lower word of each 32bit lane, 0 extending to 32 bits
+        for (uint32_t i = 0; i < 4; i++)
+        {
+            if (isComponentEnabled(compMask, i))
+            {
+                if (compCtrl[i] == ComponentControl::StoreSrc)
+                {
+                    // select correct constMask for x/z or y/w pshufb
+                    uint32_t selectedMask = ((i == 0) || (i == 2)) ? 0 : 1;
+                    // if x or y, use vi128XY permute result, else use vi128ZW
+                    uint32_t selectedGather = (i < 2) ? 0 : 1;
+
+                    // SIMD16 PSHUFB isnt part of AVX-512F, so split into SIMD8 for the sake of KNL, for now..
+
+                    Value *vGatherResult_lo = EXTRACT_16(vGatherResult[selectedGather], 0);
+                    Value *vGatherResult_hi = EXTRACT_16(vGatherResult[selectedGather], 1);
+
+                    Value *temp_lo = BITCAST(PSHUFB(BITCAST(vGatherResult_lo, v32x8Ty), vConstMask[selectedMask]), vGatherTy);
+                    Value *temp_hi = BITCAST(PSHUFB(BITCAST(vGatherResult_hi, v32x8Ty), vConstMask[selectedMask]), vGatherTy);
+
+                    // after pshufb mask for x channel; z uses the same shuffle from the second gather
+                    // 256i - 0    1    2    3    4    5    6    7
+                    //        xx00 xx00 xx00 xx00 xx00 xx00 xx00 xx00 
+
+                    // denormalize if needed
+                    if (conversionType != CONVERT_NONE)
+                    {
+                        temp_lo = FMUL(CAST(fpCast, temp_lo, mSimdFP32Ty), conversionFactor);
+                        temp_hi = FMUL(CAST(fpCast, temp_hi, mSimdFP32Ty), conversionFactor);
+                    }
+
+                    vVertexElements[currentVertexElement] = JOIN_16(temp_lo, temp_hi);
+
+                    currentVertexElement += 1;
+                }
+                else
+                {
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector16(compCtrl[i]);
+                }
+
+                if (currentVertexElement > 3)
+                {
+                    StoreVertexElements16(pVtxOut, outputElt++, 4, vVertexElements);
+                    // reset to the next vVertexElement to output
+                    currentVertexElement = 0;
+                }
+            }
+        }
+    }
+    else
+    {
+        SWR_INVALID("Unsupported conversion type");
+    }
+}
+
+#else
+#if USE_SIMD16_SHADERS
+void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args, bool useVertexID2)
+#else
 void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
+#endif
 {
     // Unpack tuple args
     Value* (&vGatherResult)[2] = std::get<0>(args);
@@ -1414,8 +2526,8 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
     Type* vGatherTy = VectorType::get(IntegerType::getInt32Ty(JM()->mContext), mVWidth);
     Type* v32x8Ty = VectorType::get(mInt8Ty, mVWidth * 4); // vwidth is units of 32 bits
 
-    // have to do extra work for sign extending
-    if ((extendType == Instruction::CastOps::SExt) || (extendType == Instruction::CastOps::SIToFP)||
+                                                           // have to do extra work for sign extending
+    if ((extendType == Instruction::CastOps::SExt) || (extendType == Instruction::CastOps::SIToFP) ||
         (extendType == Instruction::CastOps::FPExt))
     {
         // is this PP float?
@@ -1424,17 +2536,17 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
         Type* v8x16Ty = VectorType::get(mInt16Ty, 8); // 8x16bit in a 128bit lane
         Type* v128bitTy = VectorType::get(IntegerType::getIntNTy(JM()->mContext, 128), mVWidth / 4); // vwidth is units of 32 bits
 
-        // shuffle mask
-        Value* vConstMask = C<char>({0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15,
-                                     0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15});
+                                                                                                     // shuffle mask
+        Value* vConstMask = C<char>({ 0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15,
+            0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15 });
         Value* vi128XY = nullptr;
-        if(isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1)){
+        if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 1)) {
             Value* vShufResult = BITCAST(PSHUFB(BITCAST(vGatherResult[0], v32x8Ty), vConstMask), vGatherTy);
             // after pshufb: group components together in each 128bit lane
             // 256i - 0    1    2    3    4    5    6    7
             //        xxxx xxxx yyyy yyyy xxxx xxxx yyyy yyyy
 
-            vi128XY = BITCAST(PERMD(vShufResult, C<int32_t>({0, 1, 4, 5, 2, 3, 6, 7})), v128bitTy);
+            vi128XY = BITCAST(PERMD(vShufResult, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
             // after PERMD: move and pack xy components into each 128bit lane
             // 256i - 0    1    2    3    4    5    6    7
             //        xxxx xxxx xxxx xxxx yyyy yyyy yyyy yyyy
@@ -1442,9 +2554,9 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
 
         // do the same for zw components
         Value* vi128ZW = nullptr;
-        if(isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3)){
+        if (isComponentEnabled(compMask, 2) || isComponentEnabled(compMask, 3)) {
             Value* vShufResult = BITCAST(PSHUFB(BITCAST(vGatherResult[1], v32x8Ty), vConstMask), vGatherTy);
-            vi128ZW = BITCAST(PERMD(vShufResult, C<int32_t>({0, 1, 4, 5, 2, 3, 6, 7})), v128bitTy);
+            vi128ZW = BITCAST(PERMD(vShufResult, C<int32_t>({ 0, 1, 4, 5, 2, 3, 6, 7 })), v128bitTy);
         }
 
         // init denormalize variables if needed
@@ -1462,7 +2574,7 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
             conversionFactor = VIMMED1((float)(1.0));
             break;
         case CONVERT_USCALED:
-            SWR_ASSERT(0, "Type should not be sign extended!");
+            SWR_INVALID("Type should not be sign extended!");
             conversionFactor = nullptr;
             break;
         default:
@@ -1500,7 +2612,11 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
                 }
                 else
                 {
+#if USE_SIMD16_SHADERS
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
                     vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
                 }
 
                 if (currentVertexElement > 3)
@@ -1517,16 +2633,16 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
     {
         // pshufb masks for each component
         Value* vConstMask[2];
-        if(isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 2)){
+        if (isComponentEnabled(compMask, 0) || isComponentEnabled(compMask, 2)) {
             // x/z shuffle mask
-            vConstMask[0] = C<char>({0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1,
-                                     0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1, });
+            vConstMask[0] = C<char>({ 0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1,
+                0, 1, -1, -1, 4, 5, -1, -1, 8, 9, -1, -1, 12, 13, -1, -1, });
         }
-        
-        if(isComponentEnabled(compMask, 1) || isComponentEnabled(compMask, 3)){
+
+        if (isComponentEnabled(compMask, 1) || isComponentEnabled(compMask, 3)) {
             // y/w shuffle mask
-            vConstMask[1] = C<char>({2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1,
-                                     2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1});
+            vConstMask[1] = C<char>({ 2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1,
+                2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1 });
         }
 
         // init denormalize variables if needed
@@ -1544,7 +2660,7 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
             conversionFactor = VIMMED1((float)(1.0f));
             break;
         case CONVERT_SSCALED:
-            SWR_ASSERT(0, "Type should not be zero extended!");
+            SWR_INVALID("Type should not be zero extended!");
             conversionFactor = nullptr;
             break;
         default:
@@ -1579,7 +2695,11 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
                 }
                 else
                 {
+#if USE_SIMD16_SHADERS
+                    vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i], useVertexID2);
+#else
                     vVertexElements[currentVertexElement++] = GenerateCompCtrlVector(compCtrl[i]);
+#endif
                 }
 
                 if (currentVertexElement > 3)
@@ -1593,59 +2713,167 @@ void FetchJit::Shuffle16bpcGather(Shuffle16bpcArgs &args)
     }
     else
     {
-        SWR_ASSERT(0, "Unsupported conversion type");
+        SWR_INVALID("Unsupported conversion type");
     }
 }
 
+#endif
 //////////////////////////////////////////////////////////////////////////
 /// @brief Output a simdvertex worth of elements to the current outputElt
 /// @param pVtxOut - base address of VIN output struct
 /// @param outputElt - simdvertex offset in VIN to write to
 /// @param numEltsToStore - number of simdvertex rows to write out
 /// @param vVertexElements - LLVM Value*[] simdvertex to write out
+#if USE_SIMD16_GATHERS
+void FetchJit::StoreVertexElements16(Value* pVtxOut, const uint32_t outputElt, const uint32_t numEltsToStore, Value* (&vVertexElements)[4])
+{
+    SWR_ASSERT(numEltsToStore <= 4, "Invalid element count.");
+
+    for (uint32_t c = 0; c < numEltsToStore; ++c)
+    {
+        // STORE expects FP32 x vWidth type, just bitcast if needed
+        if (!vVertexElements[c]->getType()->getScalarType()->isFloatTy())
+        {
+#if FETCH_DUMP_VERTEX
+            PRINT("vVertexElements[%d]: 0x%x\n", { C(c), vVertexElements[c] });
+#endif
+            vVertexElements[c] = BITCAST(vVertexElements[c], mSimd16FP32Ty);
+        }
+#if FETCH_DUMP_VERTEX
+        else
+        {
+            PRINT("vVertexElements[%d]: %f\n", { C(c), vVertexElements[c] });
+        }
+#endif
+        // outputElt * 4 = offsetting by the size of a simdvertex
+        // + c offsets to a 32bit x vWidth row within the current vertex
+        Value* dest = GEP(pVtxOut, C(outputElt * 4 + c), "destGEP");
+        STORE(vVertexElements[c], dest);
+    }
+}
+
+#else
 void FetchJit::StoreVertexElements(Value* pVtxOut, const uint32_t outputElt, const uint32_t numEltsToStore, Value* (&vVertexElements)[4])
 {
     SWR_ASSERT(numEltsToStore <= 4, "Invalid element count.");
 
-    for(uint32_t c = 0; c < numEltsToStore; ++c)
+    for (uint32_t c = 0; c < numEltsToStore; ++c)
     {
         // STORE expects FP32 x vWidth type, just bitcast if needed
-        if(!vVertexElements[c]->getType()->getScalarType()->isFloatTy()){
+        if (!vVertexElements[c]->getType()->getScalarType()->isFloatTy())
+        {
 #if FETCH_DUMP_VERTEX
-            PRINT("vVertexElements[%d]: 0x%x\n", {C(c), vVertexElements[c]});
+            PRINT("vVertexElements[%d]: 0x%x\n", { C(c), vVertexElements[c] });
 #endif
             vVertexElements[c] = BITCAST(vVertexElements[c], mSimdFP32Ty);
         }
 #if FETCH_DUMP_VERTEX
         else
         {
-            PRINT("vVertexElements[%d]: %f\n", {C(c), vVertexElements[c]});
+            PRINT("vVertexElements[%d]: %f\n", { C(c), vVertexElements[c] });
         }
 #endif
         // outputElt * 4 = offsetting by the size of a simdvertex
         // + c offsets to a 32bit x vWidth row within the current vertex
+#if USE_SIMD16_SHADERS
+        Value* dest = GEP(pVtxOut, C(outputElt * 8 + c * 2), "destGEP");
+#else
         Value* dest = GEP(pVtxOut, C(outputElt * 4 + c), "destGEP");
+#endif
         STORE(vVertexElements[c], dest);
     }
 }
 
+#endif
 //////////////////////////////////////////////////////////////////////////
 /// @brief Generates a constant vector of values based on the 
 /// ComponentControl value
 /// @param ctrl - ComponentControl value
-Value* FetchJit::GenerateCompCtrlVector(const ComponentControl ctrl)
+#if USE_SIMD16_GATHERS
+Value *FetchJit::GenerateCompCtrlVector16(const ComponentControl ctrl)
 {
-    switch(ctrl)
+    switch (ctrl)
     {
-        case NoStore:   return VUNDEF_I();
-        case Store0:    return VIMMED1(0);
-        case Store1Fp:  return VIMMED1(1.0f);
-        case Store1Int: return VIMMED1(1);
+        case NoStore:   
+            return VUNDEF_I_16();
+        case Store0:    
+            return VIMMED1_16(0);
+        case Store1Fp:  
+            return VIMMED1_16(1.0f);
+        case Store1Int: 
+            return VIMMED1_16(1);
+        case StoreVertexId:
+        {
+            Value *pId_lo = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID  })), mSimdFP32Ty);
+            Value *pId_hi = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID2 })), mSimdFP32Ty);
+
+            Value *pId = JOIN_16(pId_lo, pId_hi);
+
+            return pId;
+        }
+        case StoreInstanceId:
+        {
+            Value *pId = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_CurInstance })), mFP32Ty);
+            return VBROADCAST_16(pId);
+        }
+
+
         case StoreSrc:
-        default:        SWR_ASSERT(0, "Invalid component control"); return VUNDEF_I();
+        default:
+            SWR_INVALID("Invalid component control");
+            return VUNDEF_I_16();
+    }
+}
+
+#else
+#if USE_SIMD16_SHADERS
+Value *FetchJit::GenerateCompCtrlVector(const ComponentControl ctrl, bool useVertexID2)
+#else
+Value *FetchJit::GenerateCompCtrlVector(const ComponentControl ctrl)
+#endif
+{
+    switch (ctrl)
+    {
+    case NoStore:
+        return VUNDEF_I();
+    case Store0:
+        return VIMMED1(0);
+    case Store1Fp:
+        return VIMMED1(1.0f);
+    case Store1Int:
+        return VIMMED1(1);
+    case StoreVertexId:
+        {
+#if USE_SIMD16_SHADERS
+            Value *pId;
+            if (useVertexID2)
+            {
+                pId = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID2 })), mSimdFP32Ty);
+            }
+            else
+            {
+                pId = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID })), mSimdFP32Ty);
+            }
+#else
+            Value *pId = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_VertexID })), mSimdFP32Ty);
+#endif
+            return pId;
+        }
+    case StoreInstanceId:
+        {
+            Value *pId = BITCAST(LOAD(GEP(mpFetchInfo, { 0, SWR_FETCH_CONTEXT_CurInstance })), mFP32Ty);
+            return VBROADCAST(pId);
+        }
+
+
+    case StoreSrc:
+    default:
+        SWR_INVALID("Invalid component control");
+        return VUNDEF_I();
     }
 }
 
+#endif
 //////////////////////////////////////////////////////////////////////////
 /// @brief Returns the enable mask for the specified component.
 /// @param enableMask - enable bits
@@ -1667,6 +2895,10 @@ bool isComponentEnabled(ComponentEnable enableMask, uint8_t component)
     }
 }
 
+// Don't want two threads compiling the same fetch shader simultaneously
+// Has problems in the JIT cache implementation
+// This is only a problem for fetch right now.
+static std::mutex gFetchCodegenMutex;
 
 //////////////////////////////////////////////////////////////////////////
 /// @brief JITs from fetch shader IR
@@ -1679,6 +2911,7 @@ PFN_FETCH_FUNC JitFetchFunc(HANDLE hJitMgr, const HANDLE hFunc)
     JitManager* pJitMgr = reinterpret_cast<JitManager*>(hJitMgr);
     PFN_FETCH_FUNC pfnFetch;
 
+    gFetchCodegenMutex.lock();
     pfnFetch = (PFN_FETCH_FUNC)(pJitMgr->mpExec->getFunctionAddress(func->getName().str()));
     // MCJIT finalizes modules the first time you JIT code from them. After finalized, you cannot add new IR to the module
     pJitMgr->mIsModuleFinalized = true;
@@ -1692,6 +2925,11 @@ PFN_FETCH_FUNC JitFetchFunc(HANDLE hJitMgr, const HANDLE hFunc)
     fclose(fd);
 #endif
 
+    pJitMgr->DumpAsm(const_cast<llvm::Function*>(func), "final");
+    gFetchCodegenMutex.unlock();
+
+
+
     return pfnFetch;
 }