[PATCH] D139535: [SPARC] Add GNU syntax extensions of WRPR instruction

[Koakuma via Phabricator via llvm-commits]

koakuma created this revision.
koakuma added reviewers: brad, dcederman, MaskRay, ro, arsenm.
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koakuma requested review of this revision.
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Add two GNU extension forms of `wrpr`:

1. `wrpr %reg, %rd -> wrpr %reg, %g0, %rd`
2. `wrpr  imm, %rd -> wrpr  %g0, imm, %rd`

Note: since the semantics of `wrpr %rs1, %rs2/imm, %rd` is `%rd <- (%rs1 xor %rs2/imm)`, in case (1) it technically doesn't matter whether the `%g0` is placed as the first or second operand, however, I'm placing it as the second operand to match the encoding of GNU as.

This fixes the `wrpr` instruction part of bug #40792 (https://github.com/llvm/llvm-project/issues/40792).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139535

Files:
  llvm/lib/Target/Sparc/SparcInstrAliases.td
  llvm/test/MC/Sparc/sparcv9-instructions.s

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