76f1949cfa
Adds the fwidth intrinsic for HLSL. The DXIL path only requires modification to the hlsl headers. The SPIRV path implements the OpFwidth builtin in Clang and instruction selection for the OpFwidth instruction in LLVM. Also adds shader stage tests to the ddx_coarse and ddy_coarse instructions used by fwidth. Closes #99120 --------- Co-authored-by: Alexander Johnston <alexander.johnston@amd.com>
13 lines
515 B
LLVM
13 lines
515 B
LLVM
; RUN: not llc -verify-machineinstrs -O0 -mtriple=spirv64-unknown-unknown %s -o /dev/null 2>&1 | FileCheck %s
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; RUN: not llc -verify-machineinstrs -O0 -mtriple=spirv32-unknown-unknown %s -o /dev/null 2>&1 | FileCheck %s
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; CHECK: LLVM ERROR: %{{.*}} = G_INTRINSIC intrinsic(@llvm.spv.fwidth), %{{.*}} is only supported in shaders.
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define noundef float @fwidth(float noundef %a) {
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entry:
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%spv.fwidth = call float @llvm.spv.fwidth.f32(float %a)
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ret float %spv.fwidth
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}
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declare float @llvm.spv.fwidth.f32(float)
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