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7086a4139d
There are plenty more instcombines we could probably do with bitreverse, but this seems like a very obvious and trivial starting point and was brought up by Hal in his review. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252879 91177308-0d34-0410-b5e6-96231b3b80d8
12 lines
276 B
LLVM
12 lines
276 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %p) {
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; CHECK-LABEL: @test1
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; CHECK-NEXT: ret i32 %p
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%a = call i32 @llvm.bitreverse.i32(i32 %p)
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%b = call i32 @llvm.bitreverse.i32(i32 %a)
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ret i32 %b
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}
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declare i32 @llvm.bitreverse.i32(i32) readnone
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