09fe84abb4
Moving code sinking pass before structurizer creates more sinking opportunities. The extra flow edges introduced by the structurizer can have adverse effects on sinking, because the sinking pass prefers moving instructions to blocks with unique predecessors and the structurizer destroys that property in some cases. A notable example is moving high-latency image instructions across kills. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D101115
43 lines
1.8 KiB
LLVM
43 lines
1.8 KiB
LLVM
; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN %s
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; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx1010 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN %s
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; Test that image.sample instruction is sunk across the branch and not left in the first block. Since the kill may terminate the shader there might be no need for sampling the image.
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; GCN-LABEL: {{^}}sinking_img_sample:
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; GCN-NOT: image_sample
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; GCN: branch
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; GCN: image_sample
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; GCN: exp null
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define amdgpu_ps float @sinking_img_sample() {
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main_body:
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%i = call <3 x float> @llvm.amdgcn.image.sample.2d.v3f32.f32(i32 7, float undef, float undef, <8 x i32> undef, <4 x i32> undef, i1 false, i32 0, i32 0)
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br i1 undef, label %endif1, label %if1
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if1: ; preds = %main_body
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call void @llvm.amdgcn.kill(i1 false) #4
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br label %exit
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endif1: ; preds = %main_body
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%i22 = extractelement <3 x float> %i, i32 2
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%i23 = call nsz arcp contract float @llvm.fma.f32(float %i22, float 0.000000e+00, float 0.000000e+00) #1
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br label %exit
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exit: ; preds = %endif1, %if1
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%i24 = phi float [ undef, %if1 ], [ %i23, %endif1 ]
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ret float %i24
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}
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; Function Attrs: nounwind readonly willreturn
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declare <3 x float> @llvm.amdgcn.image.sample.2d.v3f32.f32(i32 immarg, float, float, <8 x i32>, <4 x i32>, i1 immarg, i32 immarg, i32 immarg) #3
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; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
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declare float @llvm.fma.f32(float, float, float) #2
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; Function Attrs: nounwind
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declare void @llvm.amdgcn.kill(i1) #4
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attributes #1 = { nounwind readnone }
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attributes #2 = { nofree nosync nounwind readnone speculatable willreturn }
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attributes #3 = { nounwind readonly willreturn }
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attributes #4 = { nounwind }
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