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7089a6d8e2
This is a follow-on from the discussion in http://reviews.llvm.org/D12154. This change allows memset/memcpy to use SSE or AVX memory accesses for any chip that has generally fast unaligned memory ops. A motivating use case for this change is a clang invocation that doesn't explicitly set the CPU, but does target a feature that we know only exists on a CPU that supports fast unaligned memops. For example: $ clang -O1 foo.c -mavx This resolves a difference in lowering noted in PR24449: https://llvm.org/bugs/show_bug.cgi?id=24449 Before this patch, we used different store types depending on whether the example can be lowered as a memset or not. Differential Revision: http://reviews.llvm.org/D12288 llvm-svn: 245950 |
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