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f3c5ab15db
Summary: This is patch #3 of the new DivergenceAnalysis <https://lists.llvm.org/pipermail/llvm-dev/2018-May/123606.html> The GPUDivergenceAnalysis is intended to eventually supersede the existing LegacyDivergenceAnalysis. The existing LegacyDivergenceAnalysis produces incorrect results on unstructured Control-Flow Graphs: <https://bugs.llvm.org/show_bug.cgi?id=37185> This patch adds the option -use-gpu-divergence-analysis to the LegacyDivergenceAnalysis to turn it into a transparent wrapper for the GPUDivergenceAnalysis. Reviewers: nhaehnle Reviewed By: nhaehnle Subscribers: jholewinski, jvesely, jfb, llvm-commits, alex-t, sameerds, arsenm, nhaehnle Differential Revision: https://reviews.llvm.org/D53493 llvm-svn: 348048
32 lines
913 B
LLVM
32 lines
913 B
LLVM
; RUN: opt -mtriple=amdgcn-- -analyze -divergence -use-gpu-divergence-analysis %s | FileCheck %s
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; CHECK-LABEL: 'test1':
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; CHECK-NEXT: DIVERGENT: i32 %bound
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; CHECK: {{^ *}}%counter =
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; CHECK-NEXT: DIVERGENT: %break = icmp sge i32 %counter, %bound
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; CHECK-NEXT: DIVERGENT: br i1 %break, label %footer, label %body
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; CHECK: {{^ *}}%counter.next =
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; CHECK: {{^ *}}%counter.footer =
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; CHECK: DIVERGENT: br i1 %break, label %end, label %header
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; Note: %counter is not divergent!
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define amdgpu_ps void @test1(i32 %bound) {
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entry:
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br label %header
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header:
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%counter = phi i32 [ 0, %entry ], [ %counter.footer, %footer ]
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%break = icmp sge i32 %counter, %bound
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br i1 %break, label %footer, label %body
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body:
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%counter.next = add i32 %counter, 1
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br label %footer
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footer:
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%counter.footer = phi i32 [ %counter.next, %body ], [ undef, %header ]
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br i1 %break, label %end, label %header
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end:
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ret void
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}
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