diff options
| author | Stuart Hastings <stuart@apple.com> | 2011-05-14 05:55:10 +0000 |
|---|---|---|
| committer | Stuart Hastings <stuart@apple.com> | 2011-05-14 05:55:10 +0000 |
| commit | 67f071e69795dca1151cdb8d57d222b6f041d748 (patch) | |
| tree | c0f6dec117078c1c224aba3b698d1993cb974235 /test/Transforms | |
| parent | d0118a2371f35faa6af97e67be69e1debc615c42 (diff) | |
| download | llvm-67f071e69795dca1151cdb8d57d222b6f041d748.tar.gz llvm-67f071e69795dca1151cdb8d57d222b6f041d748.tar.bz2 llvm-67f071e69795dca1151cdb8d57d222b6f041d748.tar.xz | |
Avoid combining GEPs that might overflow at runtime.
rdar://problem/9267970
Patch by Julien Lerouge!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131339 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll b/test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll new file mode 100644 index 0000000000..d65173db8c --- /dev/null +++ b/test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll @@ -0,0 +1,19 @@ +; RUN: opt < %s -instcombine | lli +; rdar://problem/9267970 +; ideally this test will run on a 32-bit host +; must not discard GEPs that might overflow at runtime (aren't inbounds) + +define i32 @main(i32 %argc) { +entry: + %tmp1 = add i32 %argc, -2 + %tmp2 = add i32 %argc, 1879048192 + %p = alloca i8 + %p1 = getelementptr i8* %p, i32 %tmp1 + %p2 = getelementptr i8* %p, i32 %tmp2 + %cmp = icmp ult i8* %p1, %p2 + br i1 %cmp, label %bbtrue, label %bbfalse +bbtrue: ; preds = %entry + ret i32 -1 +bbfalse: ; preds = %entry + ret i32 0 +} |