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| author | Victor Hernandez <vhernandez@apple.com> | 2009-10-13 01:42:53 +0000 |
|---|---|---|
| committer | Victor Hernandez <vhernandez@apple.com> | 2009-10-13 01:42:53 +0000 |
| commit | 5c78736f85579aa6de38cba2742ea13ff9f79e70 (patch) | |
| tree | 02cdb4477646ea25599656ced604675bd7a989d4 /test/Transforms/GVN | |
| parent | 2b7b37a4c929add924018b717ef9fcc058f1b27f (diff) | |
| download | llvm-5c78736f85579aa6de38cba2742ea13ff9f79e70.tar.gz llvm-5c78736f85579aa6de38cba2742ea13ff9f79e70.tar.bz2 llvm-5c78736f85579aa6de38cba2742ea13ff9f79e70.tar.xz | |
Memory dependence analysis was incorrectly stopping to scan for stores to a pointer at bitcast uses of a malloc call.
It should continue scanning until the malloc call, and this patch fixes that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83931 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GVN')
| -rw-r--r-- | test/Transforms/GVN/2009-11-12-MemDepMallocBitCast.ll | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/test/Transforms/GVN/2009-11-12-MemDepMallocBitCast.ll b/test/Transforms/GVN/2009-11-12-MemDepMallocBitCast.ll new file mode 100644 index 0000000000..b433297bba --- /dev/null +++ b/test/Transforms/GVN/2009-11-12-MemDepMallocBitCast.ll @@ -0,0 +1,15 @@ +; Test to make sure malloc's bitcast does not block detection of a store +; to aliased memory; GVN should not optimize away the load in this program. +; RUN: opt < %s -gvn -S | FileCheck %s + +define i64 @test() { + %1 = tail call i8* @malloc(i64 mul (i64 4, i64 ptrtoint (i64* getelementptr (i64* null, i64 1) to i64))) ; <i8*> [#uses=2] + store i8 42, i8* %1 + %X = bitcast i8* %1 to i64* ; <i64*> [#uses=1] + %Y = load i64* %X ; <i64> [#uses=1] + ret i64 %Y +; CHECK: %Y = load i64* %X +; CHECK: ret i64 %Y +} + +declare noalias i8* @malloc(i64) |