[PATCH] D11195: [PeepholeOptimizer] Refactor optimizeUncoalescable logic. NFC

[Bruno Cardoso Lopes]

bruno created this revision.
bruno added reviewers: qcolombet, MatzeB.
bruno added a subscriber: llvm-commits.
bruno set the repository for this revision to rL LLVM.

The PeepholeOptimizer misses some rewrite opportunities since it can't look through PHI instructions.
This patch cleans the current logic a bit while preparing for another patch that can handle PHIs. Changes include:

- Create a new CopyRewriter for Uncoalescable copy-like instructions.
- Change the ValueTracker to return a ValueTrackerResult.
 
This makes optimizeUncoalescable looks more like optimizeCoalescable and use the CopyRewritter infrastructure.
    


Repository:
  rL LLVM

http://reviews.llvm.org/D11195

Files:
  lib/CodeGen/PeepholeOptimizer.cpp

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