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7a37166a7a
When the MOVBE instructions are available, use them for 16-bit endian swapping as well as for 32 and 64 bit. The patterns were already present on the instructions, but weren't being matched because the operation was unconditionally marked to 'Expand.' Change that to be conditional on whether the MOVBE instructions are available. Use 'rolw' to implement the in-register version (32 and 64 bit have the dedicated 'bswap' instruction for that). Patch by Louis Gerbarg <lgg@apple.com>. rdar://15479984 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203524 91177308-0d34-0410-b5e6-96231b3b80d8 |
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