diff options
| author | Tom Stellard <tstellar@gmail.com> | 2010-09-06 10:57:20 -0700 |
|---|---|---|
| committer | Tom Stellard <tstellar@gmail.com> | 2010-09-10 18:18:09 -0700 |
| commit | 564653b9f196b9bf91fe772fd1ca1e131ff33774 (patch) | |
| tree | bd15383ef73b4c30c53d688e21307612175238c3 /src/mesa/drivers/dri | |
| parent | a64b4a05af362fff52c9e52eb51cd92fe164afcc (diff) | |
r300/compiler: Add peephole optimization for the 'sub' presubtract operation
Diffstat (limited to 'src/mesa/drivers/dri')
| -rw-r--r-- | src/mesa/drivers/dri/r300/compiler/radeon_optimize.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c index 3ff07d6039..2bed2dd9c5 100644 --- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c +++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c @@ -597,19 +597,32 @@ static int presub_helper( 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) { - inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[0]; - inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[1]; + 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 = RC_PRESUB_ADD; + 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 = RC_PRESUB_ADD; + inst->U.I.SrcReg[src_index].Index = presub_opcode; } static int peephole_add_presub_add( @@ -648,10 +661,6 @@ static int peephole_add_presub_add( if (!src1) return 0; - /* XXX Only do add for now. */ - if (src0->Negate) - 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)) { |