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intel/nir: Make ffma peephole optimization preserve fp_fast_math flags

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float_controls2 may have marked these as needing to preserve NaN or
other values.  If so, our newly contracted ffma needs to as well.

Fixes dEQP-VK.spirv_assembly.instruction.compute.float_controls2.*.input_args.mat_det_testedWithout_NotNan*
when nir_opt_algebraic is run after this pass.

Cc: mesa-stable
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36750>
(cherry picked from commit 1b0808adf3)
This commit is contained in:
Kenneth Graunke 2025-09-15 13:49:46 -07:00 • committed by Eric Engestrom
parent f0d08a5ceb
commit 84739d85bf
2 changed files with 2 additions and 1 deletions
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2
.pick_status.json
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@ -124,7 +124,7 @@
"description": "intel/nir: Make ffma peephole optimization preserve fp_fast_math flags",
"nominated": true,
"nomination_type": 1,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": null,
"notes": null

1
src/intel/compiler/intel_nir_opt_peephole_ffma.c
View file

@ -224,6 +224,7 @@ intel_nir_opt_peephole_ffma_instr(nir_builder *b,
mul_src[0] = nir_fneg(b, mul_src[0]);
nir_alu_instr *ffma = nir_alu_instr_create(b->shader, nir_op_ffma);
ffma->fp_fast_math = mul->fp_fast_math | add->fp_fast_math;
for (unsigned i = 0; i < 2; i++) {
ffma->src[i].src = nir_src_for_ssa(mul_src[i]);