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brw: Skip unnecessary UNDEFs for comparisons

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For example, SIMD16 W/UW fills an entire REG_SIZE so UNDEF isn't needed.

No change in fossil-db.

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31833>
This commit is contained in:
Kenneth Graunke 2024-10-23 01:34:40 -07:00 • committed by Marge Bot
parent 771e65b0db
commit 2e108afb8c
1 changed files with 2 additions and 2 deletions
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4
src/intel/compiler/brw_from_nir.cpp
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@ -1346,7 +1346,7 @@ brw_from_nir_emit_alu(nir_to_brw_state &ntb, nir_alu_instr *instr,
const uint32_t bit_size = nir_src_bit_size(instr->src[0].src);
if (bit_size != 32) {
dest = bld.vgrf(op[0].type);
bld.UNDEF(dest);
bld.emit_undef_for_partial_reg(dest);
}
bld.CMP(dest, op[0], op[1], brw_cmod_for_nir_comparison(instr->op));
@ -1382,7 +1382,7 @@ brw_from_nir_emit_alu(nir_to_brw_state &ntb, nir_alu_instr *instr,
const uint32_t bit_size = brw_type_size_bits(op[0].type);
if (bit_size != 32) {
dest = bld.vgrf(op[0].type);
bld.UNDEF(dest);
bld.emit_undef_for_partial_reg(dest);
}
bld.CMP(dest, op[0], op[1],