[PATCH] D141113: Improve mul 2^N +/- 2 pattern

[Noah Goldstein via Phabricator via llvm-commits]

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Previous pattern was omitting ops in sequence which just increases the
latency (to 3c, same as imul!).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141113

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/mul-constant-i16.ll
  llvm/test/CodeGen/X86/mul-constant-i32.ll
  llvm/test/CodeGen/X86/mul-constant-i64.ll
  llvm/test/CodeGen/X86/mul-constant-i8.ll
  llvm/test/CodeGen/X86/mul-constant-result.ll

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