[PATCH] D48789: [X86] Replace (32/64 - n) shift amounts with (neg n) since the shift amount is masked in hardware

[Craig Topper via Phabricator via llvm-commits]

craig.topper updated this revision to Diff 162025.
craig.topper added a comment.

Rebase and fix the CSE handling.


https://reviews.llvm.org/D48789

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/clear-lowbits.ll
  test/CodeGen/X86/extract-lowbits.ll
  test/CodeGen/X86/schedule-x86-64-shld.ll

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