[PATCH] D87384: [PowerPC] Add ISEL patterns for Mul with Imm.

[EsmeYi via Phabricator via llvm-commits]

Esme created this revision.
Esme added reviewers: PowerPC, steven.zhang, nemanjai, jsji, qiucf.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.
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Esme requested review of this revision.

If the multiplicand is a constant with following formats:

1. mul with **(2^N + int16_imm)** -> `mulli + rldicr`
2. mul with **(2^N + 2^M)** -> `rldicr + add + rldicr`
3. mul with **(2^N + 2^M)** -> `rldicr + sub + rldicr`


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87384

Files:
  llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
  llvm/test/CodeGen/PowerPC/mulli.ll

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