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7284df400a
When calculating whether a value can safely overflow for use by an icmp, we weren't checking that the value couldn't wrap around. To do this we need the icmp to be using a constant, as well as the incoming add or sub. bugzilla report: https://bugs.llvm.org/show_bug.cgi?id=39060 Differential Revision: https://reviews.llvm.org/D52463 llvm-svn: 343092
34 lines
749 B
LLVM
34 lines
749 B
LLVM
; RUN: llc -mtriple=armv7a-linux-androideabi %s -o - | FileCheck %s
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@a = local_unnamed_addr global i16 -1, align 2
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@b = local_unnamed_addr global i16 0, align 2
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; CHECK-LABEL: pr39060:
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; CHECK: ldrh
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; CHECK: ldrh
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; CHECK: sub
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; CHECK: uxth
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define void @pr39060() local_unnamed_addr #0 {
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entry:
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%0 = load i16, i16* @a, align 2
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%1 = load i16, i16* @b, align 2
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%sub = add i16 %1, -1
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%cmp = icmp eq i16 %0, %sub
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br i1 %cmp, label %if.else, label %if.then
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if.then:
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tail call void bitcast (void (...)* @f to void ()*)() #2
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br label %if.end
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if.else:
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tail call void bitcast (void (...)* @g to void ()*)() #2
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br label %if.end
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if.end:
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ret void
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}
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declare void @f(...) local_unnamed_addr #1
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declare void @g(...) local_unnamed_addr #1
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