[PATCH] D66561: [X86] Remove encoding information from the TAILJMP instructions that are lowered by MCInstLowering. Fix LowerPATCHABLE_TAIL_CALL to also convert them to regular JMP/JCC instructions

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: spatel, RKSimon, hans, dberris.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

There are 5 instructions here that are converted from TAILJMP opcodes to regular JMP/JCC opcodes during MCInstLowering. So normally there encoding information isn't used. The exception being when XRay wraps them in PATCHABLE_TAIL_CALL.

This patch fixes PATCHABLE_TAIL_CALL to do the same opcode conversion as the regular lowering patch. Then removes the encoding information.


https://reviews.llvm.org/D66561

Files:
  llvm/lib/Target/X86/X86InstrControl.td
  llvm/lib/Target/X86/X86MCInstLower.cpp

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