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d1be160c96
Given that large parts of inst combine is restricted to instructions which have one use, getting rid of a use on the condition can help the effectiveness of the optimizer. Also, it allows the condition to potentially be deleted by instcombine rather than waiting for another pass. I noticed this completely by accident in another test case. It's not anything that actually came from a real workload. p.s. We should probably do the same thing for switch instructions. Differential Revision: http://reviews.llvm.org/D8220 llvm-svn: 231881
17 lines
279 B
LLVM
17 lines
279 B
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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define i32 @test(i32 %x) {
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; CHECK-LABEL: @test
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entry:
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; CHECK-NOT: icmp
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; CHECK: br i1 undef,
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%cmp = icmp ult i32 %x, 7
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br i1 %cmp, label %merge, label %merge
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merge:
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; CHECK-LABEL: merge:
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; CHECK: ret i32 %x
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ret i32 %x
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}
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