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aco: create mads when signed zeros should be preserved

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This check was added because I thought v_mad_f32 didn't preserve the
signess of zero, but I can't reproduce that and this isn't mentioned
anywhere in LLVM.

No fossil-db changes.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5245>
This commit is contained in:
Rhys Perry 2020-05-15 14:24:12 +01:00 • committed by Marge Bot
parent 1b6a319c15
commit 6cb42cdd8f
1 changed files with 1 additions and 1 deletions
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2
src/amd/compiler/aco_optimizer.cpp
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@ -2414,7 +2414,7 @@ void combine_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr
else if ((instr->opcode == aco_opcode::v_add_f32 ||
instr->opcode == aco_opcode::v_sub_f32 ||
instr->opcode == aco_opcode::v_subrev_f32) &&
block.fp_mode.denorm32 == 0 && !block.fp_mode.preserve_signed_zero_inf_nan32) {
block.fp_mode.denorm32 == 0) {
//TODO: we could use fma instead when denormals are enabled if the NIR isn't marked as precise
uint32_t uses_src0 = UINT32_MAX;