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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-07-13 21:29:53 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-07-13 21:29:53 +0000 |
| commit | 2a01946de4e510e42691f8dc5e7331fcecb67432 (patch) | |
| tree | f8a9759d7f27ff272114ae8bb6d247fc973cb354 /test/CodeGen/X86 | |
| parent | 0d8dae292a088c3a742f655c1787782abfe7e34c (diff) | |
| download | external_llvm-2a01946de4e510e42691f8dc5e7331fcecb67432.zip external_llvm-2a01946de4e510e42691f8dc5e7331fcecb67432.tar.gz external_llvm-2a01946de4e510e42691f8dc5e7331fcecb67432.tar.bz2 | |
Make sure we don't combine a large displacement and a frame index in the same addressing mode on x86-64. It can overflow, leading to a crash/miscompile.
<rdar://problem/9763308>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135084 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86')
| -rw-r--r-- | test/CodeGen/X86/2011-07-13-BadFrameIndexDisplacement.ll | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2011-07-13-BadFrameIndexDisplacement.ll b/test/CodeGen/X86/2011-07-13-BadFrameIndexDisplacement.ll new file mode 100644 index 0000000..7632034 --- /dev/null +++ b/test/CodeGen/X86/2011-07-13-BadFrameIndexDisplacement.ll @@ -0,0 +1,20 @@ +; RUN: llc -march=x86-64 < %s -disable-fp-elim | FileCheck %s + +; This test is checking that we don't crash and we don't incorrectly fold +; a large displacement and a frame index into a single lea. +; <rdar://problem/9763308> + +declare void @bar([39 x i8]*) +define i32 @f(i64 %a, i64 %b) nounwind readnone { +entry: + %stack_main = alloca [39 x i8] + call void @bar([39 x i8]* %stack_main) + %tmp6 = add i64 %a, -2147483647 + %.sum = add i64 %tmp6, %b + %tmp8 = getelementptr inbounds [39 x i8]* %stack_main, i64 0, i64 %.sum + %tmp9 = load i8* %tmp8, align 1 + %tmp10 = sext i8 %tmp9 to i32 + ret i32 %tmp10 +} +; CHECK: f: +; CHECK: movsbl -2147483647 |