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nir: Rework nir_scalar_chase_movs a bit

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The cases in the if are the same as the cases we're using for the early
break.  Just check the things and break if it's not a handleable case.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24704>
This commit is contained in:
Faith Ekstrand 2023-08-15 10:21:10 -05:00 • committed by Marge Bot
parent cf796aa885
commit 87004fa701
1 changed files with 3 additions and 5 deletions
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8
src/compiler/nir/nir.c
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@ -2719,16 +2719,14 @@ nir_scalar_chase_movs(nir_scalar s)
{
while (nir_scalar_is_alu(s)) {
nir_alu_instr *alu = nir_instr_as_alu(s.def->parent_instr);
if (!nir_alu_instr_is_copy(alu))
break;
if (alu->op == nir_op_mov) {
s.def = alu->src[0].src.ssa;
s.comp = alu->src[0].swizzle[s.comp];
} else {
assert(nir_op_is_vec(alu->op));
} else if (nir_op_is_vec(alu->op)) {
s.def = alu->src[s.comp].src.ssa;
s.comp = alu->src[s.comp].swizzle[0];
} else {
break;
}
}