From 4bb697d938d17bbdd5124db0102d97fb9ead2229 Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Fri, 1 Nov 2019 15:17:22 -0700 Subject: [PATCH] freedreno/ir3: only tex instructions have wrmask At the ir3 level, we would assume that we could use wrmask to mask off other components of an instruction returning a vecN when they are not used. Which would let RA use components not written for other live values. But this is only true for tex instructions. Signed-off-by: Rob Clark Reviewed-by: Kristian H. Kristensen Reviewed-by: Eric Anholt --- src/freedreno/ir3/ir3_depth.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/src/freedreno/ir3/ir3_depth.c b/src/freedreno/ir3/ir3_depth.c index bdd0069..4bbd1e5 100644 --- a/src/freedreno/ir3/ir3_depth.c +++ b/src/freedreno/ir3/ir3_depth.c @@ -177,13 +177,10 @@ remove_unused_by_block(struct ir3_block *block) if (instr->flags & IR3_INSTR_UNUSED) { if (instr->opc == OPC_META_SPLIT) { struct ir3_instruction *src = ssa(instr->regs[1]); - /* leave inputs alone.. we can't optimize out components of - * an input, since the hw is still going to be writing all - * of the components, and we could end up in a situation - * where multiple inputs overlap. + /* tex (cat5) instructions have a writemask, so we can + * mask off unused components. Other instructions do not. */ - if ((src->opc != OPC_META_INPUT) && - (src->regs[0]->wrmask > 1)) { + if (is_tex(src) && (src->regs[0]->wrmask > 1)) { src->regs[0]->wrmask &= ~(1 << instr->split.off); /* prune no-longer needed right-neighbors. We could -- 2.7.4