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ObjectSizeOffsetEvaluator: Don't run into infinite recursion if we have a cyclic GEP.

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Those can occur in dead code. PR17402.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191644 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-09-29 19:39:13 +00:00
parent 67a2553749
commit 2f08433210
2 changed files with 24 additions and 5 deletions
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17
test/Instrumentation/BoundsChecking/simple.ll
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@@ -126,3 +126,20 @@ define i64 @f12(i64 %x, i64 %y) nounwind {
%4 = load i64* %3, align 8
ret i64 %4
}
; PR17402
; CHECK-LABEL: @f13
define void @f13() nounwind {
entry:
br label %alive
dead:
; Self-refential GEPs can occur in dead code.
%incdec.ptr = getelementptr inbounds i32* %incdec.ptr, i64 1
; CHECK: %incdec.ptr = getelementptr inbounds i32* %incdec.ptr
%l = load i32* %incdec.ptr
br label %alive
alive:
ret void
}