[PATCH] D145893: Fix wrong action for encode movdir64b

[Wang, Xin via Phabricator via llvm-commits]

XinWang10 created this revision.
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Movdir64b is special for its mem operand, 67 prefex can not only modify its add size,
so it's mem base and index reg should be the same type as source reg, such as
movdir64b (%rdx), rcx, and could not be movdir64b (%edx), rcx.
Now llvm-mc can encode the asm 'movdir64b (%edx), rcx' but the result is the same as 
'movdir64b (%edx), ecx', which offend users' intention, while gcc will object this 
action and give a warning.
I add 3 new mem discriptions to let llvm-mc to report the same error.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145893

Files:
  llvm/lib/Target/X86/AsmParser/X86Operand.h
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/lib/Target/X86/X86InstrMisc.td
  llvm/test/MC/X86/index-operations.s
  llvm/utils/TableGen/X86RecognizableInstr.cpp

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