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Commit 23eb468b authored by Craig Topper's avatar Craig Topper
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Fix assembling of xchg %eax, %eax to not use the NOP encoding of 0x90. This... 

Fix assembling of xchg %eax, %eax to not use the NOP encoding of 0x90. This was done by creating a new register group that excludes AX registers. Fixes PR10345. Also added aliases for flipping the order of the operands of xchg <reg>, %eax.

llvm-svn: 141274
parent 540017e5
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