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ac: use fma on gfx10 

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
This commit is contained in:
Marek Olšák 2019-08-26 16:19:31 -04:00
parent d979e5bfab
commit d64593e3c4
2 changed files with 9 additions and 1 deletions
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7
src/amd/common/ac_llvm_build.c
View File

@ -2665,6 +2665,13 @@ LLVMValueRef ac_build_imad(struct ac_llvm_context *ctx, LLVMValueRef s0,
LLVMValueRef ac_build_fmad(struct ac_llvm_context *ctx, LLVMValueRef s0,
LLVMValueRef s1, LLVMValueRef s2)
{
/* FMA is better on GFX10, because it has FMA units instead of MUL-ADD units. */
if (ctx->chip_class >= GFX10) {
return ac_build_intrinsic(ctx, "llvm.fma.f32", ctx->f32,
(LLVMValueRef []) {s0, s1, s2}, 3,
AC_FUNC_ATTR_READNONE);
}
return LLVMBuildFAdd(ctx->builder,
LLVMBuildFMul(ctx->builder, s0, s1, ""), s2, "");
}

3
src/amd/common/ac_nir_to_llvm.c
View File

@ -811,7 +811,8 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
}
break;
case nir_op_ffma:
result = emit_intrin_3f_param(&ctx->ac, "llvm.fmuladd",
/* FMA is better on GFX10, because it has FMA units instead of MUL-ADD units. */
result = emit_intrin_3f_param(&ctx->ac, ctx->ac.chip_class >= GFX10 ? "llvm.fma" : "llvm.fmuladd",
ac_to_float_type(&ctx->ac, def_type), src[0], src[1], src[2]);
break;
case nir_op_ldexp: