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This patch fixes the x86 implementation of allowsMisalignedMemoryAccess() to correctly return the 'Fast' output parameter for 32-byte accesses. To test that, an existing load merging optimization is changed to use the TLI hook. This exposes a shortcoming in the current logic and results in the regression test update. Changing other direct users of the isUnalignedMem32Slow() x86 CPU attribute would be a follow-on patch. Without the fix in allowsMisalignedMemoryAccesses(), we will infinite loop when targeting SandyBridge because LowerINSERT_SUBVECTOR() creates 32-byte loads from two 16-byte loads while PerformLOADCombine() splits them back into 16-byte loads. Differential Revision: http://reviews.llvm.org/D10662 llvm-svn: 245075 |
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