forked from OSchip/llvm-project
31 lines
623 B
LLVM
31 lines
623 B
LLVM
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; RUN: opt -S < %s -gvn-hoist | FileCheck %s
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declare void @llvm.sideeffect()
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; GVN hoisting across a @llvm.sideeffect.
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; CHECK-LABEL: scalarsHoisting
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; CHECK: = fsub
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; CHECK: br i1 %cmp,
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; CHECK-NOT: fsub
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define float @scalarsHoisting(float %d, float %m, float %a, i1 %cmp) {
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entry:
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br i1 %cmp, label %if.then, label %if.else
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if.then:
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call void @llvm.sideeffect()
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%sub0 = fsub float %m, %a
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%mul = fmul float %sub0, %d
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br label %if.end
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if.else:
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%sub1 = fsub float %m, %a
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%div = fdiv float %sub1, %d
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br label %if.end
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if.end:
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%phi = phi float [ %mul, %if.then ], [ %div, %if.else ]
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ret float %phi
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}
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