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  7. Aug 25, 2006
    • Chris Lattner's avatar
      Take advantage of the recent improvements to the liveintervals set (tracking · bdf12106
      Chris Lattner authored
      instructions which define each value#) to simplify and improve the coallescer.
      In particular, this patch:
      
      1. Implements iterative coallescing.
      2. Reverts an unsafe hack from handlePhysRegDef, superceeding it with a
         better solution.
      3. Implements PR865, "coallescing" away the second copy in code like:
      
         A = B
         ...
         B = A
      
      This also includes changes to symbolically print registers in intervals
      when possible.
      
      llvm-svn: 29862
      bdf12106
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  21. Oct 26, 2005
  22. Oct 21, 2005
    • Chris Lattner's avatar
      Make the coallescer a bit smarter, allowing it to join more live ranges. · e95b5745
      Chris Lattner authored
      For example, we can now join things like [0-30:0)[31-40:1)[52-59:2)
      with [40:60:0) if the 52-59 range is defined by a copy from the 40-60 range.
      The resultant range ends up being [0-30:0)[31-60:1).
      
      This fires a lot through-out the test suite (e.g. shrinking bc from
      19492 -> 18509 machineinstrs) though most gains are smaller (e.g. about
      50 copies eliminated from crafty).
      
      llvm-svn: 23866
      e95b5745
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