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| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2012-11-29 14:25:47 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2012-11-29 14:25:47 +0000 |
| commit | 84af05e1ba3a97d98b76929df858edc7b8b0d252 (patch) | |
| tree | d2dc56e904161e98cb77c44ab9f01898ffa2d36d /test/Instrumentation | |
| parent | 3a10b49781afcf0ea445d69dfc6949335269f231 (diff) | |
| download | llvm-84af05e1ba3a97d98b76929df858edc7b8b0d252.tar.gz llvm-84af05e1ba3a97d98b76929df858edc7b8b0d252.tar.bz2 llvm-84af05e1ba3a97d98b76929df858edc7b8b0d252.tar.xz | |
[msan] Propagate shadow through (x<0) and (x>=0) comparisons.
This is a special case of signed relational comparison where result
only depends on the sign of x.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168881 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Instrumentation')
| -rw-r--r-- | test/Instrumentation/MemorySanitizer/msan_basic.ll | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/test/Instrumentation/MemorySanitizer/msan_basic.ll b/test/Instrumentation/MemorySanitizer/msan_basic.ll index 2346d75f8e..8d729d6d41 100644 --- a/test/Instrumentation/MemorySanitizer/msan_basic.ll +++ b/test/Instrumentation/MemorySanitizer/msan_basic.ll @@ -235,6 +235,53 @@ entry: ; CHECK: } +; Check that we propagate shadow for x<0, x>=0, etc (i.e. sign bit tests) + +define zeroext i1 @ICmpSLT(i32 %x) nounwind uwtable readnone { + %1 = icmp slt i32 %x, 0 + ret i1 %1 +} + +; CHECK: define zeroext i1 @ICmpSLT +; CHECK: icmp slt +; CHECK: icmp slt +; CHECK-NOT: br +; CHECK: } + +define zeroext i1 @ICmpSGE(i32 %x) nounwind uwtable readnone { + %1 = icmp sge i32 %x, 0 + ret i1 %1 +} + +; CHECK: define zeroext i1 @ICmpSGE +; CHECK: icmp slt +; CHECK: icmp sge +; CHECK-NOT: br +; CHECK: } + +define zeroext i1 @ICmpSGT(i32 %x) nounwind uwtable readnone { + %1 = icmp sgt i32 0, %x + ret i1 %1 +} + +; CHECK: define zeroext i1 @ICmpSGT +; CHECK: icmp slt +; CHECK: icmp sgt +; CHECK-NOT: br +; CHECK: } + +define zeroext i1 @ICmpSLE(i32 %x) nounwind uwtable readnone { + %1 = icmp sle i32 0, %x + ret i1 %1 +} + +; CHECK: define zeroext i1 @ICmpSLE +; CHECK: icmp slt +; CHECK: icmp sle +; CHECK-NOT: br +; CHECK: } + + ; Check that loads from shadow have the same aligment as the original loads. define i32 @ShadowLoadAlignmentLarge() nounwind uwtable { |