Skip to content
  1. Oct 08, 2010
  2. Aug 06, 2010
  3. Jul 22, 2010
  4. Jul 16, 2010
  5. Jul 03, 2010
  6. Feb 13, 2010
  7. Feb 12, 2010
    • Bob Wilson's avatar
      Add a new pass on machine instructions to optimize away PHI cycles that · 0827e040
      Bob Wilson authored
      reduce down to a single value.  InstCombine already does this transformation
      but DAG legalization may introduce new opportunities.  This has turned out to
      be important for ARM where 64-bit values are split up during type legalization:
      InstCombine is not able to remove the PHI cycles on the 64-bit values but
      the separate 32-bit values can be optimized.  I measured the compile time 
      impact of this (running llc on 176.gcc) and it was not significant.
      
      llvm-svn: 95951
      0827e040
Loading