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x == -y --> x+y == 0 x != -y --> x+y != 0 On x86, the generated code goes from negl %esi cmpl %esi, %edi je .LBB0_2 to addl %esi, %edi je .L4 This case is correctly handled for ARM with "cmn". Patch by Manman Ren. rdar://11245199 PR12545 llvm-svn: 155739
23 lines
502 B
LLVM
23 lines
502 B
LLVM
; RUN: llc < %s -march=x86-64 | FileCheck %s
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; rdar://11245199
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; PR12545
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define void @f(i32 %x, i32 %y) nounwind uwtable ssp {
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entry:
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; CHECK: f:
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; CHECK-NOT: neg
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; CHECK: add
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%sub = sub i32 0, %y
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%cmp = icmp eq i32 %x, %sub
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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tail call void @g() nounwind
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret void
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}
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declare void @g()
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