diff options
| -rw-r--r-- | src/mesa/drivers/dri/r300/compiler/radeon_optimize.c | 60 |
1 files changed, 27 insertions, 33 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c index 0c6b1bd720a..c15a9b1c451 100644 --- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c +++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c @@ -533,51 +533,45 @@ static int presub_helper( 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++) { if(s->Inst->U.I.DstReg.WriteMask != src_reads_dst_mask(inst->U.I.SrcReg[i], s->Inst->U.I.DstReg)) { continue; } - if (cant_sub) { - can_remove = 0; - break; - } - /* 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. Note: This if statement should not be pulled - * outside of the loop, because it only applies to - * instructions that could potentially use the - * presubtract source. */ - if (info->NumSrcRegs > 2) { + if (cant_sub || !can_use_presub) { can_remove = 0; break; } - - if (info->HasTexture) { - can_remove = 0; - break; - } - - /* 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_remove = 0; - break; - } - } presub_replace(s, inst, i); can_remove = 1; } |