[PATCH] D46040: [X86] Form MUL_IMM for multiplies with 3/5/9 to block load folding.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.

Previously we only formed MUL_IMM when we split a constant. This blocked load folding on those cases. We should also form MUL_IMM for 3/5/9 to favor LEA over load folding.


Repository:
  rL LLVM

https://reviews.llvm.org/D46040

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

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