From 67f071e69795dca1151cdb8d57d222b6f041d748 Mon Sep 17 00:00:00 2001 From: Stuart Hastings Date: Sat, 14 May 2011 05:55:10 +0000 Subject: 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 --- test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 test/Transforms/InstCombine/2011-05-13-InBoundsGEP.ll (limited to 'test/Transforms') 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 +} -- cgit v1.2.3