arch-gcn3: Explicitly sign-extend simm16

In some instructions, simm16 needs to be sign extended. Previous code
simply casted the simm16 to a 32-bit or 64-bit datatype, however this
didn't actually sign-extend the value.

This patch explicitly calls sext<16> on simm16 whenever it's supposed
to be sign-extended.

Change-Id: I32f02e51fbab220d1a73dc7e68c7410937db21c7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/37495
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

diff --git a/src/arch/gcn3/insts/instructions.cc b/src/arch/gcn3/insts/instructions.cc
index 93fc142ebd282a581e09130a021a62fcee15d3ba..e8951a9a5d733d2fd81a8176e6ba1099f206d714 100644 (file)
--- a/src/arch/gcn3/insts/instructions.cc
+++ b/src/arch/gcn3/insts/instructions.cc
@@ -1369,7 +1369,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_MOVK_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ScalarOperandI32 sdst(gpuDynInst, instData.SDST);
 
         sdst = simm16;
@@ -1393,7 +1393,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMOVK_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ScalarOperandI32 sdst(gpuDynInst, instData.SDST);
         ConstScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1419,7 +1419,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_EQ_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1444,7 +1444,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_LG_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1469,7 +1469,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_GT_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1494,7 +1494,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_GE_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1519,7 +1519,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_LT_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1544,7 +1544,7 @@ namespace Gcn3ISA
     void
     Inst_SOPK__S_CMPK_LE_I32::execute(GPUDynInstPtr gpuDynInst)
     {
-        ScalarRegI32 simm16 = (ScalarRegI32)instData.SIMM16;
+        ScalarRegI32 simm16 = (ScalarRegI32)sext<16>(instData.SIMM16);
         ConstScalarOperandI32 src(gpuDynInst, instData.SDST);
         ScalarOperandU32 scc(gpuDynInst, REG_SCC);
 
@@ -1727,7 +1727,7 @@ namespace Gcn3ISA
 
         src.read();
 
-        sdst = src.rawData() + (ScalarRegI32)simm16;
+        sdst = src.rawData() + (ScalarRegI32)sext<16>(simm16);
         scc = (bits(src.rawData(), 31) == bits(simm16, 15)
             && bits(src.rawData(), 31) != bits(sdst.rawData(), 31)) ? 1 : 0;
 
@@ -1754,7 +1754,7 @@ namespace Gcn3ISA
 
         sdst.read();
 
-        sdst = sdst.rawData() * (ScalarRegI32)simm16;
+        sdst = sdst.rawData() * (ScalarRegI32)sext<16>(simm16);
 
         sdst.write();
     }
@@ -3902,7 +3902,7 @@ namespace Gcn3ISA
         Addr pc = wf->pc();
         ScalarRegI16 simm16 = instData.SIMM16;
 
-        pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+        pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
 
         wf->pc(pc);
     }
@@ -3948,7 +3948,7 @@ namespace Gcn3ISA
         scc.read();
 
         if (!scc.rawData()) {
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
         }
 
         wf->pc(pc);
@@ -3977,7 +3977,7 @@ namespace Gcn3ISA
         scc.read();
 
         if (scc.rawData()) {
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
         }
 
         wf->pc(pc);
@@ -4007,7 +4007,7 @@ namespace Gcn3ISA
         vcc.read();
 
         if (!vcc.rawData()) {
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
         }
 
         wf->pc(pc);
@@ -4037,7 +4037,7 @@ namespace Gcn3ISA
         if (vcc.rawData()) {
             Addr pc = wf->pc();
             ScalarRegI16 simm16 = instData.SIMM16;
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
             wf->pc(pc);
         }
     }
@@ -4062,7 +4062,7 @@ namespace Gcn3ISA
         if (wf->execMask().none()) {
             Addr pc = wf->pc();
             ScalarRegI16 simm16 = instData.SIMM16;
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
             wf->pc(pc);
         }
     }
@@ -4087,7 +4087,7 @@ namespace Gcn3ISA
         if (wf->execMask().any()) {
             Addr pc = wf->pc();
             ScalarRegI16 simm16 = instData.SIMM16;
-            pc = pc + ((ScalarRegI64)simm16 * 4LL) + 4LL;
+            pc = pc + ((ScalarRegI64)sext<16>(simm16 * 4LL)) + 4LL;
             wf->pc(pc);
         }
     }