/*
* Copyright (C) 2009 Nicolai Haehnle.
+ * Copyright 2010 Tom Stellard <tstellar@gmail.com>
*
* All Rights Reserved.
*
#include "radeon_dataflow.h"
#include "radeon_compiler.h"
+#include "radeon_compiler_util.h"
#include "radeon_swizzle.h"
+struct peephole_state {
+ struct rc_instruction * Inst;
+ /** Stores a bitmask of the components that are still "alive" (i.e.
+ * they have not been written to since Inst was executed.)
+ */
+ unsigned int WriteMask;
+};
+
+typedef void (*rc_presub_replace_fn)(struct peephole_state *,
+ struct rc_instruction *,
+ unsigned int);
static struct rc_src_register chain_srcregs(struct rc_src_register outer, struct rc_src_register inner)
{
return combine;
}
-struct peephole_state {
+struct copy_propagate_state {
struct radeon_compiler * C;
struct rc_instruction * Mov;
unsigned int Conflict:1;
int BranchDepth;
};
-/**
- * This is a callback function that is meant to be passed to
- * rc_for_all_reads_mask. This function will be called once for each source
- * register in inst.
- * @param inst The instruction that the source register belongs to.
- * @param file The register file of the source register.
- * @param index The index of the source register.
- * @param mask The components of the source register that are being read from.
- */
-static void peephole_scan_read(void * data, struct rc_instruction * inst,
- rc_register_file file, unsigned int index, unsigned int mask)
+static void copy_propagate_scan_read(void * data, struct rc_instruction * inst,
+ struct rc_src_register * src)
{
- struct peephole_state * s = data;
+ rc_register_file file = src->File;
+ struct rc_reader_data * reader_data = data;
+ const struct rc_opcode_info * info = rc_get_opcode_info(inst->U.I.Opcode);
+
+ /* It is possible to do copy propigation in this situation,
+ * just not right now, see peephole_add_presub_inv() */
+ if (reader_data->Writer->U.I.PreSub.Opcode != RC_PRESUB_NONE &&
+ (info->NumSrcRegs > 2 || info->HasTexture)) {
+ reader_data->Abort = 1;
+ return;
+ }
- if (file != RC_FILE_TEMPORARY || index != s->Mov->U.I.DstReg.Index)
+ /* XXX This could probably be handled better. */
+ if (file == RC_FILE_ADDRESS) {
+ reader_data->Abort = 1;
return;
+ }
/* These instructions cannot read from the constants file.
* see radeonTransformTEX()
*/
- if(s->Mov->U.I.SrcReg[0].File != RC_FILE_TEMPORARY &&
- s->Mov->U.I.SrcReg[0].File != RC_FILE_INPUT &&
+ if(reader_data->Writer->U.I.SrcReg[0].File != RC_FILE_TEMPORARY &&
+ reader_data->Writer->U.I.SrcReg[0].File != RC_FILE_INPUT &&
(inst->U.I.Opcode == RC_OPCODE_TEX ||
inst->U.I.Opcode == RC_OPCODE_TXB ||
inst->U.I.Opcode == RC_OPCODE_TXP ||
inst->U.I.Opcode == RC_OPCODE_KIL)){
- s->Conflict = 1;
+ reader_data->Abort = 1;
return;
}
- if ((mask & s->MovMask) == mask) {
- if (s->SourceClobbered) {
- s->Conflict = 1;
- }
- } else if ((mask & s->DefinedMask) == mask) {
- /* read from something entirely written by other instruction: this is okay */
- } else {
- /* read from component combination that is not well-defined without
- * the MOV: cannot remove it */
- s->Conflict = 1;
- }
}
-static void peephole_scan_write(void * data, struct rc_instruction * inst,
+static void copy_propagate_scan_write(void * data, struct rc_instruction * inst,
rc_register_file file, unsigned int index, unsigned int mask)
{
- struct peephole_state * s = data;
-
- if (s->BranchDepth < 0)
- return;
+ struct rc_reader_data * reader_data = data;
+ struct copy_propagate_state * s = reader_data->CbData;
- if (file == s->Mov->U.I.DstReg.File && index == s->Mov->U.I.DstReg.Index) {
- s->MovMask &= ~mask;
- if (s->BranchDepth == 0)
- s->DefinedMask |= mask;
- else
- s->DefinedMask &= ~mask;
- }
- if (file == s->Mov->U.I.SrcReg[0].File && index == s->Mov->U.I.SrcReg[0].Index) {
+ if (file == reader_data->Writer->U.I.SrcReg[0].File && index == reader_data->Writer->U.I.SrcReg[0].Index) {
if (mask & s->SourcedMask)
- s->SourceClobbered = 1;
+ reader_data->AbortOnRead = 1;
} else if (s->Mov->U.I.SrcReg[0].RelAddr && file == RC_FILE_ADDRESS) {
- s->SourceClobbered = 1;
+ reader_data->AbortOnRead = 1;
}
}
-static void peephole(struct radeon_compiler * c, struct rc_instruction * inst_mov)
+static void copy_propagate(struct radeon_compiler * c, struct rc_instruction * inst_mov)
{
- struct peephole_state s;
-
- if (inst_mov->U.I.DstReg.File != RC_FILE_TEMPORARY || inst_mov->U.I.WriteALUResult)
+ struct copy_propagate_state s;
+ struct rc_reader_data reader_data;
+ unsigned int i;
+
+ if (inst_mov->U.I.DstReg.File != RC_FILE_TEMPORARY ||
+ inst_mov->U.I.DstReg.RelAddr ||
+ inst_mov->U.I.WriteALUResult ||
+ inst_mov->U.I.SaturateMode)
return;
memset(&s, 0, sizeof(s));
s.MovMask = inst_mov->U.I.DstReg.WriteMask;
s.DefinedMask = RC_MASK_XYZW & ~s.MovMask;
+ reader_data.CbData = &s;
+
for(unsigned int chan = 0; chan < 4; ++chan) {
unsigned int swz = GET_SWZ(inst_mov->U.I.SrcReg[0].Swizzle, chan);
s.SourcedMask |= (1 << swz) & RC_MASK_XYZW;
}
- /* 1st pass: Check whether all subsequent readers can be changed */
- for(struct rc_instruction * inst = inst_mov->Next;
- inst != &c->Program.Instructions;
- inst = inst->Next) {
- /* XXX In the future we might be able to make the optimizer
- * smart enough to handle loops. */
- if(inst->U.I.Opcode == RC_OPCODE_BGNLOOP
- || inst->U.I.Opcode == RC_OPCODE_ENDLOOP){
- return;
- }
- rc_for_all_reads_mask(inst, peephole_scan_read, &s);
- rc_for_all_writes_mask(inst, peephole_scan_write, &s);
- if (s.Conflict)
- return;
+ /* Get a list of all the readers of this MOV instruction. */
+ rc_get_readers_normal(c, inst_mov, &reader_data,
+ copy_propagate_scan_read, copy_propagate_scan_write);
- if (s.BranchDepth >= 0) {
- if (inst->U.I.Opcode == RC_OPCODE_IF) {
- s.BranchDepth++;
- } else if (inst->U.I.Opcode == RC_OPCODE_ENDIF
- || inst->U.I.Opcode == RC_OPCODE_ELSE) {
- s.BranchDepth--;
- if (s.BranchDepth < 0) {
- s.DefinedMask &= ~s.MovMask;
- s.MovMask = 0;
- }
- }
- }
- }
-
- if (s.Conflict)
+ if (reader_data.Abort || reader_data.ReaderCount == 0)
return;
- /* 2nd pass: We can satisfy all readers, so switch them over all at once */
- s.MovMask = inst_mov->U.I.DstReg.WriteMask;
- s.BranchDepth = 0;
-
- for(struct rc_instruction * inst = inst_mov->Next;
- inst != &c->Program.Instructions;
- inst = inst->Next) {
- const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
-
- for(unsigned int src = 0; src < opcode->NumSrcRegs; ++src) {
- if (inst->U.I.SrcReg[src].File == RC_FILE_TEMPORARY &&
- inst->U.I.SrcReg[src].Index == s.Mov->U.I.DstReg.Index) {
- unsigned int refmask = 0;
+ /* Propagate the MOV instruction. */
+ for (i = 0; i < reader_data.ReaderCount; i++) {
+ struct rc_instruction * inst = reader_data.Readers[i].Inst;
+ *reader_data.Readers[i].Src = chain_srcregs(*reader_data.Readers[i].Src, s.Mov->U.I.SrcReg[0]);
- for(unsigned int chan = 0; chan < 4; ++chan) {
- unsigned int swz = GET_SWZ(inst->U.I.SrcReg[src].Swizzle, chan);
- refmask |= (1 << swz) & RC_MASK_XYZW;
- }
-
- if ((refmask & s.MovMask) == refmask)
- inst->U.I.SrcReg[src] = chain_srcregs(inst->U.I.SrcReg[src], s.Mov->U.I.SrcReg[0]);
- }
- }
-
- if (opcode->HasDstReg) {
- if (inst->U.I.DstReg.File == RC_FILE_TEMPORARY &&
- inst->U.I.DstReg.Index == s.Mov->U.I.DstReg.Index) {
- s.MovMask &= ~inst->U.I.DstReg.WriteMask;
- }
- }
-
- if (s.BranchDepth >= 0) {
- if (inst->U.I.Opcode == RC_OPCODE_IF) {
- s.BranchDepth++;
- } else if (inst->U.I.Opcode == RC_OPCODE_ENDIF
- || inst->U.I.Opcode == RC_OPCODE_ELSE) {
- s.BranchDepth--;
- if (s.BranchDepth < 0)
- break; /* no more readers after this point */
- }
- }
+ if (s.Mov->U.I.SrcReg[0].File == RC_FILE_PRESUB)
+ inst->U.I.PreSub = s.Mov->U.I.PreSub;
}
/* Finally, remove the original MOV instruction */
return 1;
}
-
static void constant_folding_mad(struct rc_instruction * inst)
{
rc_swizzle swz;
}
}
-
/**
* Replace 0.0, 1.0 and 0.5 immediate constants by their
* respective swizzles. Simplify instructions like ADD dst, src, 0;
static void constant_folding(struct radeon_compiler * c, struct rc_instruction * inst)
{
const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
+ unsigned int i;
/* Replace 0.0, 1.0 and 0.5 immediates by their explicit swizzles */
for(unsigned int src = 0; src < opcode->NumSrcRegs; ++src) {
+ struct rc_constant * constant;
+ struct rc_src_register newsrc;
+ int have_real_reference;
+
if (inst->U.I.SrcReg[src].File != RC_FILE_CONSTANT ||
inst->U.I.SrcReg[src].RelAddr ||
inst->U.I.SrcReg[src].Index >= c->Program.Constants.Count)
continue;
- struct rc_constant * constant =
+ constant =
&c->Program.Constants.Constants[inst->U.I.SrcReg[src].Index];
if (constant->Type != RC_CONSTANT_IMMEDIATE)
continue;
- struct rc_src_register newsrc = inst->U.I.SrcReg[src];
- int have_real_reference = 0;
+ newsrc = inst->U.I.SrcReg[src];
+ have_real_reference = 0;
for(unsigned int chan = 0; chan < 4; ++chan) {
unsigned int swz = GET_SWZ(newsrc.Swizzle, chan);
+ unsigned int newswz;
+ float imm;
+ float baseimm;
+
if (swz >= 4)
continue;
- unsigned int newswz;
- float imm = constant->u.Immediate[swz];
- float baseimm = imm;
+ imm = constant->u.Immediate[swz];
+ baseimm = imm;
if (imm < 0.0)
baseimm = -baseimm;
constant_folding_mul(inst);
else if (inst->U.I.Opcode == RC_OPCODE_ADD)
constant_folding_add(inst);
+
+ /* In case this instruction has been converted, make sure all of the
+ * registers that are no longer used are empty. */
+ opcode = rc_get_opcode_info(inst->U.I.Opcode);
+ for(i = opcode->NumSrcRegs; i < 3; i++) {
+ memset(&inst->U.I.SrcReg[i], 0, sizeof(struct rc_src_register));
+ }
+}
+
+/**
+ * If src and dst use the same register, this function returns a writemask that
+ * indicates wich components are read by src. Otherwise zero is returned.
+ */
+static unsigned int src_reads_dst_mask(struct rc_src_register src,
+ struct rc_dst_register dst)
+{
+ if (dst.File != src.File || dst.Index != src.Index) {
+ return 0;
+ }
+ return rc_swizzle_to_writemask(src.Swizzle);
+}
+
+/* Return 1 if the source registers has a constant swizzle (e.g. 0, 0.5, 1.0)
+ * in any of its channels. Return 0 otherwise. */
+static int src_has_const_swz(struct rc_src_register src) {
+ int chan;
+ for(chan = 0; chan < 4; chan++) {
+ unsigned int swz = GET_SWZ(src.Swizzle, chan);
+ if (swz == RC_SWIZZLE_ZERO || swz == RC_SWIZZLE_HALF
+ || swz == RC_SWIZZLE_ONE) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void peephole_scan_write(void * data, struct rc_instruction * inst,
+ rc_register_file file, unsigned int index, unsigned int mask)
+{
+ struct peephole_state * s = data;
+ if(s->Inst->U.I.DstReg.File == file
+ && s->Inst->U.I.DstReg.Index == index) {
+ unsigned int common_mask = s->WriteMask & mask;
+ s->WriteMask &= ~common_mask;
+ }
+}
+
+static int presub_helper(
+ struct radeon_compiler * c,
+ struct peephole_state * s,
+ rc_presubtract_op presub_opcode,
+ rc_presub_replace_fn presub_replace)
+{
+ struct rc_instruction * inst;
+ unsigned int can_remove = 0;
+ unsigned int cant_sub = 0;
+
+ for(inst = s->Inst->Next; inst != &c->Program.Instructions;
+ inst = inst->Next) {
+ unsigned int i;
+ unsigned char can_use_presub = 1;
+ const struct rc_opcode_info * info =
+ rc_get_opcode_info(inst->U.I.Opcode);
+ /* XXX: There are some situations where instructions
+ * with more than 2 src registers can use the
+ * presubtract select, but to keep things simple we
+ * will disable presubtract on these instructions for
+ * now. */
+ if (info->NumSrcRegs > 2 || info->HasTexture) {
+ can_use_presub = 0;
+ }
+
+ /* We can't use more than one presubtract value in an
+ * instruction, unless the two prsubtract operations
+ * are the same and read from the same registers. */
+ if (inst->U.I.PreSub.Opcode != RC_PRESUB_NONE) {
+ if (inst->U.I.PreSub.Opcode != presub_opcode
+ || inst->U.I.PreSub.SrcReg[0].File !=
+ s->Inst->U.I.SrcReg[1].File
+ || inst->U.I.PreSub.SrcReg[0].Index !=
+ s->Inst->U.I.SrcReg[1].Index) {
+ can_use_presub = 0;
+ }
+ }
+
+ /* Even if the instruction can't use a presubtract operation
+ * we still need to check if the instruction reads from
+ * s->Inst->U.I.DstReg, because if it does we must not
+ * remove s->Inst. */
+ for(i = 0; i < info->NumSrcRegs; i++) {
+ unsigned int mask = src_reads_dst_mask(
+ inst->U.I.SrcReg[i], s->Inst->U.I.DstReg);
+ /* XXX We could be more aggressive here using
+ * presubtract. It is okay if SrcReg[i] only reads
+ * from some of the mask components. */
+ if(s->Inst->U.I.DstReg.WriteMask != mask) {
+ if (s->Inst->U.I.DstReg.WriteMask & mask) {
+ can_remove = 0;
+ break;
+ } else {
+ continue;
+ }
+ }
+ if (cant_sub || !can_use_presub) {
+ can_remove = 0;
+ break;
+ }
+ presub_replace(s, inst, i);
+ can_remove = 1;
+ }
+ if(!can_remove)
+ break;
+ rc_for_all_writes_mask(inst, peephole_scan_write, s);
+ /* If all components of inst_add's destination register have
+ * been written to by subsequent instructions, the original
+ * value of the destination register is no longer valid and
+ * we can't keep doing substitutions. */
+ if (!s->WriteMask){
+ break;
+ }
+ /* Make this instruction doesn't write to the presubtract source. */
+ if (inst->U.I.DstReg.WriteMask &
+ src_reads_dst_mask(s->Inst->U.I.SrcReg[1],
+ inst->U.I.DstReg)
+ || src_reads_dst_mask(s->Inst->U.I.SrcReg[0],
+ inst->U.I.DstReg)
+ || info->IsFlowControl) {
+ cant_sub = 1;
+ }
+ }
+ return can_remove;
+}
+
+/* This function assumes that s->Inst->U.I.SrcReg[0] and
+ * s->Inst->U.I.SrcReg[1] aren't both negative. */
+static void presub_replace_add(struct peephole_state *s,
+ struct rc_instruction * inst,
+ unsigned int src_index)
+{
+ rc_presubtract_op presub_opcode;
+ if (s->Inst->U.I.SrcReg[1].Negate || s->Inst->U.I.SrcReg[0].Negate)
+ presub_opcode = RC_PRESUB_SUB;
+ else
+ presub_opcode = RC_PRESUB_ADD;
+
+ if (s->Inst->U.I.SrcReg[1].Negate) {
+ inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[1];
+ inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[0];
+ } else {
+ inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[0];
+ inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[1];
+ }
+ inst->U.I.PreSub.SrcReg[0].Negate = 0;
+ inst->U.I.PreSub.SrcReg[1].Negate = 0;
+ inst->U.I.PreSub.Opcode = presub_opcode;
+ inst->U.I.SrcReg[src_index] = chain_srcregs(inst->U.I.SrcReg[src_index],
+ inst->U.I.PreSub.SrcReg[0]);
+ inst->U.I.SrcReg[src_index].File = RC_FILE_PRESUB;
+ inst->U.I.SrcReg[src_index].Index = presub_opcode;
+}
+
+static int is_presub_candidate(struct rc_instruction * inst)
+{
+ const struct rc_opcode_info * info = rc_get_opcode_info(inst->U.I.Opcode);
+ unsigned int i;
+
+ if (inst->U.I.PreSub.Opcode != RC_PRESUB_NONE || inst->U.I.SaturateMode)
+ return 0;
+
+ for(i = 0; i < info->NumSrcRegs; i++) {
+ if (src_reads_dst_mask(inst->U.I.SrcReg[i], inst->U.I.DstReg))
+ return 0;
+ }
+ return 1;
+}
+
+static int peephole_add_presub_add(
+ struct radeon_compiler * c,
+ struct rc_instruction * inst_add)
+{
+ struct rc_src_register * src0 = NULL;
+ struct rc_src_register * src1 = NULL;
+ unsigned int i;
+ struct peephole_state s;
+
+ if (!is_presub_candidate(inst_add))
+ return 0;
+
+ if (inst_add->U.I.SrcReg[0].Swizzle != inst_add->U.I.SrcReg[1].Swizzle)
+ return 0;
+
+ /* src0 and src1 can't have absolute values only one can be negative and they must be all negative or all positive. */
+ for (i = 0; i < 2; i++) {
+ if (inst_add->U.I.SrcReg[i].Abs)
+ return 0;
+ if ((inst_add->U.I.SrcReg[i].Negate
+ & inst_add->U.I.DstReg.WriteMask) ==
+ inst_add->U.I.DstReg.WriteMask) {
+ src0 = &inst_add->U.I.SrcReg[i];
+ } else if (!src1) {
+ src1 = &inst_add->U.I.SrcReg[i];
+ } else {
+ src0 = &inst_add->U.I.SrcReg[i];
+ }
+ }
+
+ if (!src1)
+ return 0;
+
+ s.Inst = inst_add;
+ s.WriteMask = inst_add->U.I.DstReg.WriteMask;
+ if (presub_helper(c, &s, RC_PRESUB_ADD, presub_replace_add)) {
+ rc_remove_instruction(inst_add);
+ return 1;
+ }
+ return 0;
+}
+
+static void presub_replace_inv(struct peephole_state * s,
+ struct rc_instruction * inst,
+ unsigned int src_index)
+{
+ /* We must be careful not to modify s->Inst, since it
+ * is possible it will remain part of the program.
+ * XXX Maybe pass a struct instead of a pointer for s->Inst.*/
+ inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[1];
+ inst->U.I.PreSub.SrcReg[0].Negate = 0;
+ inst->U.I.PreSub.Opcode = RC_PRESUB_INV;
+ inst->U.I.SrcReg[src_index] = chain_srcregs(inst->U.I.SrcReg[src_index],
+ inst->U.I.PreSub.SrcReg[0]);
+
+ inst->U.I.SrcReg[src_index].File = RC_FILE_PRESUB;
+ inst->U.I.SrcReg[src_index].Index = RC_PRESUB_INV;
+}
+
+/**
+ * PRESUB_INV: ADD TEMP[0], none.1, -TEMP[1]
+ * Use the presubtract 1 - src0 for all readers of TEMP[0]. The first source
+ * of the add instruction must have the constatnt 1 swizzle. This function
+ * does not check const registers to see if their value is 1.0, so it should
+ * be called after the constant_folding optimization.
+ * @return
+ * 0 if the ADD instruction is still part of the program.
+ * 1 if the ADD instruction is no longer part of the program.
+ */
+static int peephole_add_presub_inv(
+ struct radeon_compiler * c,
+ struct rc_instruction * inst_add)
+{
+ unsigned int i, swz, mask;
+ struct peephole_state s;
+
+ if (!is_presub_candidate(inst_add))
+ return 0;
+
+ mask = inst_add->U.I.DstReg.WriteMask;
+
+ /* Check if src0 is 1. */
+ /* XXX It would be nice to use is_src_uniform_constant here, but that
+ * function only works if the register's file is RC_FILE_NONE */
+ for(i = 0; i < 4; i++ ) {
+ swz = GET_SWZ(inst_add->U.I.SrcReg[0].Swizzle, i);
+ if(((1 << i) & inst_add->U.I.DstReg.WriteMask)
+ && swz != RC_SWIZZLE_ONE) {
+ return 0;
+ }
+ }
+
+ /* Check src1. */
+ if ((inst_add->U.I.SrcReg[1].Negate & inst_add->U.I.DstReg.WriteMask) !=
+ inst_add->U.I.DstReg.WriteMask
+ || inst_add->U.I.SrcReg[1].Abs
+ || (inst_add->U.I.SrcReg[1].File != RC_FILE_TEMPORARY
+ && inst_add->U.I.SrcReg[1].File != RC_FILE_CONSTANT)
+ || src_has_const_swz(inst_add->U.I.SrcReg[1])) {
+
+ return 0;
+ }
+
+ /* Setup the peephole_state information. */
+ s.Inst = inst_add;
+ s.WriteMask = inst_add->U.I.DstReg.WriteMask;
+
+ if (presub_helper(c, &s, RC_PRESUB_INV, presub_replace_inv)) {
+ rc_remove_instruction(inst_add);
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * @return
+ * 0 if inst is still part of the program.
+ * 1 if inst is no longer part of the program.
+ */
+static int peephole(struct radeon_compiler * c, struct rc_instruction * inst)
+{
+ switch(inst->U.I.Opcode){
+ case RC_OPCODE_ADD:
+ if (c->has_presub) {
+ if(peephole_add_presub_inv(c, inst))
+ return 1;
+ if(peephole_add_presub_add(c, inst))
+ return 1;
+ }
+ break;
+ default:
+ break;
+ }
+ return 0;
}
void rc_optimize(struct radeon_compiler * c, void *user)
constant_folding(c, cur);
+ if(peephole(c, cur))
+ continue;
+
if (cur->U.I.Opcode == RC_OPCODE_MOV) {
- peephole(c, cur);
+ copy_propagate(c, cur);
/* cur may no longer be part of the program */
}
}
projects / mesa.git / blobdiff