[PATCH] D91391: [PowerPC] Fix for excessive ACC copies due to PHI nodes

[Baptiste Saleil via Phabricator via llvm-commits]

bsaleil created this revision.
bsaleil added reviewers: nemanjai, saghir, PowerPC.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.
Herald added a project: LLVM.
bsaleil requested review of this revision.

When using accumulators in loops, they are passed around in PHI nodes of unprimed accumulators, causing the generation of additional
prime/unprime instructions. This patch detects these cases and changes these PHI nodes to primed accumulator PHI nodes.
We also add IR and MIR test cases for several PHI node cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D91391

Files:
  llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
  llvm/test/CodeGen/PowerPC/mma-intrinsics.ll
  llvm/test/CodeGen/PowerPC/mma-phi-accs.ll
  llvm/test/CodeGen/PowerPC/peephole-phi-acc.mir

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