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amd/common: use llvm.amdgcn.wqm for explicit derivatives

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To comply with an upcoming change in LLVM, see
https://reviews.llvm.org/D46051

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Nicolai Hähnle 2018-05-01 11:06:18 +02:00
parent b30949a9c2
commit c0acb596f4
1 changed files with 7 additions and 0 deletions
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7
src/amd/common/ac_llvm_build.c
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@ -1248,6 +1248,13 @@ ac_build_ddxy(struct ac_llvm_context *ctx,
tl = LLVMBuildBitCast(ctx->builder, tl, ctx->f32, "");
trbl = LLVMBuildBitCast(ctx->builder, trbl, ctx->f32, "");
result = LLVMBuildFSub(ctx->builder, trbl, tl, "");
if (HAVE_LLVM >= 0x0700) {
result = ac_build_intrinsic(ctx,
"llvm.amdgcn.wqm.f32", ctx->f32,
&result, 1, 0);
}
return result;
}