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4333f49afe
turn icmp eq a+x, b+x into icmp eq a, b if a+x or b+x has other uses. This may have been increasing register pressure leading to the bzip2 slowdown. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63487 91177308-0d34-0410-b5e6-96231b3b80d8
23 lines
455 B
LLVM
23 lines
455 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {%B = add i8 %b, %x}
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; PR2698
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declare void @use1(i1)
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declare void @use8(i8)
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define void @test1(i8 %a, i8 %b, i8 %x) {
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%A = add i8 %a, %x
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%B = add i8 %b, %x
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%C = icmp eq i8 %A, %B
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call void @use1(i1 %C)
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ret void
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}
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define void @test2(i8 %a, i8 %b, i8 %x) {
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%A = add i8 %a, %x
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%B = add i8 %b, %x
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%C = icmp eq i8 %A, %B
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call void @use1(i1 %C)
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call void @use8(i8 %A)
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ret void
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}
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