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ac/llvm: open code fpow on LLVM 12 using fmul.legacy

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A quick look at the asm shows that this enables source modifiers
(neg, abs) for v_mul_legacy_f32.

Totals from affected shaders:
SGPRS: 110104 -> 110400 (0.27 %)
VGPRS: 57632 -> 57636 (0.01 %)
Spilled SGPRs: 66 -> 63 (-4.55 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 3290412 -> 3283068 (-0.22 %) bytes
Max Waves: 32141 -> 32141 (0.00 %)

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9395>
This commit is contained in:
Marek Olšák
2021-02-12 01:06:18 -05:00
committed by Marge Bot
parent 18c1c1404d
commit a0cc0b3a15
1 changed files with 11 additions and 0 deletions
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11
src/amd/llvm/ac_nir_to_llvm.c
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@@ -852,6 +852,17 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
ac_to_float_type(&ctx->ac, def_type), result);
break;
}
if (LLVM_VERSION_MAJOR >= 12) {
result = emit_intrin_1f_param(&ctx->ac, "llvm.log2",
ac_to_float_type(&ctx->ac, def_type), src[0]);
result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.fmul.legacy", ctx->ac.f32,
(LLVMValueRef[]){result, ac_to_float(&ctx->ac, src[1])},
2, AC_FUNC_ATTR_READNONE);
result = emit_intrin_1f_param(&ctx->ac, "llvm.exp2",
ac_to_float_type(&ctx->ac, def_type), result);
break;
}
/* Older LLVM doesn't have fmul.legacy. */
result = emit_intrin_2f_param(&ctx->ac, "llvm.pow", ac_to_float_type(&ctx->ac, def_type),
src[0], src[1]);
break;