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Commit 19e44b45 authored by Evan Cheng's avatar Evan Cheng
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- Make the machine cse dumb coalescer (as opposed to the more awesome simple

  coalescer) handle sub-register classes.
- Add heuristics to avoid non-profitable cse. Given the current lack of live
  range splitting, avoid cse when an expression has PHI use and the would be
  new use is in a BB where the expression wasn't already being used.

llvm-svn: 98043
parent 772952f4
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