[all-commits] [llvm/llvm-project] 74ae77: [PowerPC] Do not emit dssall on AIX

[Nemanja Ivanovic via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 74ae778176ec4dc8303e7f0c7dbab973c4c2e97c
      https://github.com/llvm/llvm-project/commit/74ae778176ec4dc8303e7f0c7dbab973c4c2e97c
  Author: Nemanja Ivanovic <nemanja.i.ibm at gmail.com>
  Date:   2021-05-17 (Mon, 17 May 2021)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCInstrAltivec.td
    M llvm/lib/Target/PowerPC/PPCInstrInfo.td
    A llvm/test/CodeGen/PowerPC/dssall.ll

  Log Message:
  -----------
  [PowerPC] Do not emit dssall on AIX

This instruction is a nop on all server cores (certainly on all
cores that AIX supports) so it is fine to emit a nop instead of it.
In fact, that is exactly what XL emits. So we emit a nop on AIX
and we leave the codegen as is on other platforms since there may
indeed be cores out there for which this actually does some prefetching.