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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-08-17 14:16:37 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-08-17 14:16:37 +0000 |
| commit | 823573a38137191678bf1c7194048ab51d39f33c (patch) | |
| tree | 472061a6fb24c4bf3255ff53fb6d2a77bb9cbd47 /test | |
| parent | 4e81d40545b01e0ce486b4de72282e66b91f48e9 (diff) | |
| download | external_llvm-823573a38137191678bf1c7194048ab51d39f33c.zip external_llvm-823573a38137191678bf1c7194048ab51d39f33c.tar.gz external_llvm-823573a38137191678bf1c7194048ab51d39f33c.tar.bz2 | |
Guard MemoryBuiltins against self-looping GEPs, which can occur in unreachable code due to constant propagation.
Fixes PR13621.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162098 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/objsize.ll | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/objsize.ll b/test/Transforms/InstCombine/objsize.ll index dbb0ffc..d7e2921 100644 --- a/test/Transforms/InstCombine/objsize.ll +++ b/test/Transforms/InstCombine/objsize.ll @@ -238,3 +238,20 @@ xpto: return: ret i32 42 } + +; CHECK: @PR13621 +define i32 @PR13621(i1 %bool) nounwind { +entry: + %cond = or i1 %bool, true + br i1 %cond, label %return, label %xpto + +; technically reachable, but this malformed IR may appear as a result of constant propagation +xpto: + %gep = getelementptr i8* %gep, i32 1 + %o = call i32 @llvm.objectsize.i32(i8* %gep, i1 true) +; CHECK: ret i32 undef + ret i32 %o + +return: + ret i32 7 +} |