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r300/compiler: copy-propagate saturate mode when possible 

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
This commit is contained in:
Marek Olšák 2013-02-03 16:54:59 +01:00
parent ae8696c7ee
commit 1d3561d877
1 changed files with 19 additions and 2 deletions
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21
src/gallium/drivers/r300/compiler/radeon_optimize.c
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@ -143,8 +143,7 @@ static void copy_propagate(struct radeon_compiler * c, struct rc_instruction * i
unsigned int i;
if (inst_mov->U.I.DstReg.File != RC_FILE_TEMPORARY ||
inst_mov->U.I.WriteALUResult ||
inst_mov->U.I.SaturateMode)
inst_mov->U.I.WriteALUResult)
return;
/* Get a list of all the readers of this MOV instruction. */
@ -156,6 +155,22 @@ static void copy_propagate(struct radeon_compiler * c, struct rc_instruction * i
if (reader_data.Abort || reader_data.ReaderCount == 0)
return;
/* We can propagate SaturateMode if all the readers are MOV instructions
* without a presubtract operation, source negation and absolute.
* In that case, we just move SaturateMode to all readers. */
if (inst_mov->U.I.SaturateMode) {
for (i = 0; i < reader_data.ReaderCount; i++) {
struct rc_instruction * inst = reader_data.Readers[i].Inst;
if (inst->U.I.Opcode != RC_OPCODE_MOV ||
inst->U.I.SrcReg[0].File == RC_FILE_PRESUB ||
inst->U.I.SrcReg[0].Abs ||
inst->U.I.SrcReg[0].Negate) {
return;
}
}
}
/* Propagate the MOV instruction. */
for (i = 0; i < reader_data.ReaderCount; i++) {
struct rc_instruction * inst = reader_data.Readers[i].Inst;
@ -163,6 +178,8 @@ static void copy_propagate(struct radeon_compiler * c, struct rc_instruction * i
if (inst_mov->U.I.SrcReg[0].File == RC_FILE_PRESUB)
inst->U.I.PreSub = inst_mov->U.I.PreSub;
if (!inst->U.I.SaturateMode)
inst->U.I.SaturateMode = inst_mov->U.I.SaturateMode;
}
/* Finally, remove the original MOV instruction */