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author | Tanya Lattner <tonic@nondot.org> | 2009-09-16 01:10:57 +0000 |
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committer | Tanya Lattner <tonic@nondot.org> | 2009-09-16 01:10:57 +0000 |
commit | c47a943d7b1fac192844d6f837d3b7d441dc0f9e (patch) | |
tree | ab78d5885aca86045e1a9d15b9970fc4ad1f080c | |
parent | 318048b28887b27e3da60346cfa94bf4ef5c4558 (diff) | |
download | llvm-c47a943d7b1fac192844d6f837d3b7d441dc0f9e.tar.gz |
Merge 81810 from mainline.
When extending a memset range past the front, set the alignment of the
memset region to the alignment of the new start address.
llvm-svn: 81976
-rw-r--r-- | llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp | 1 | ||||
-rw-r--r-- | llvm/test/Transforms/MemCpyOpt/align.ll | 18 |
2 files changed, 19 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp index f6da52931e91..5182b4b4bcd8 100644 --- a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp +++ b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp @@ -271,6 +271,7 @@ void MemsetRanges::addStore(int64_t Start, StoreInst *SI) { if (Start < I->Start) { I->Start = Start; I->StartPtr = SI->getPointerOperand(); + I->Alignment = SI->getAlignment(); } // Now we know that Start <= I->End and Start >= I->Start (so the startpoint diff --git a/llvm/test/Transforms/MemCpyOpt/align.ll b/llvm/test/Transforms/MemCpyOpt/align.ll new file mode 100644 index 000000000000..a9d03378521f --- /dev/null +++ b/llvm/test/Transforms/MemCpyOpt/align.ll @@ -0,0 +1,18 @@ +; RUN: opt < %s -S -memcpyopt | FileCheck %s + +; The resulting memset is only 4-byte aligned, despite containing +; a 16-byte alignmed store in the middle. + +; CHECK: call void @llvm.memset.i64(i8* %a01, i8 0, i64 16, i32 4) + +define void @foo(i32* %p) { + %a0 = getelementptr i32* %p, i64 0 + store i32 0, i32* %a0, align 4 + %a1 = getelementptr i32* %p, i64 1 + store i32 0, i32* %a1, align 16 + %a2 = getelementptr i32* %p, i64 2 + store i32 0, i32* %a2, align 4 + %a3 = getelementptr i32* %p, i64 3 + store i32 0, i32* %a3, align 4 + ret void +} |