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4 Commits

Author SHA1 Message Date
Matthias Braun 71f9564e7f LiveIntervalAnalysis: Rework constructMainRangeFromSubranges() 
We now use LiveRangeCalc::extendToUses() instead of a specially designed
algorithm in constructMainRangeFromSubranges():
- The original motivation for constructMainRangeFromSubranges() were
  differences between the main liverange and subranges because of hidden
  dead definitions. This case however cannot happen anymore with the
  DetectDeadLaneMasks pass in place.
- It simplifies the code.
- This fixes a longstanding bug where we did not properly create new SSA
  values on merging control flow (the MachineVerifier missed most of
  these cases).
- Move constructMainRangeFromSubranges() to LiveIntervalAnalysis and
  LiveRangeCalc to better match the implementation/available helper
  functions.

This re-applies r269016. The fixes from r270290 and r270259 should avoid
the machine verifier problems this time.

llvm-svn: 270291
 2016-05-20 23:14:56 +00:00
Tom Stellard 740af6f3b0 Revert "LiveIntervalAnalysis: Rework constructMainRangeFromSubranges()" 
This reverts commit r269016 and also the follow-up commit r269020.

This patch caused PR27705.

llvm-svn: 269344
 2016-05-12 20:27:40 +00:00
Matthias Braun 11e87cc945 liveness.mir requires asserts to use -debug-only 
llvm-svn: 269020
 2016-05-10 05:38:47 +00:00
Matthias Braun 8d6e57b216 LiveIntervalAnalysis: Rework constructMainRangeFromSubranges() 
We now use LiveRangeCalc::extendToUses() instead of a specially designed
algorithm in constructMainRangeFromSubranges():
- The original motivation for constructMainRangeFromSubranges() were
  differences between the main liverange and subranges because of hidden
  dead definitions. This case however cannot happen anymore with the
  DetectDeadLaneMasks pass in place.
- It simplifies the code.
- This fixes a longstanding bug where we did not properly create new SSA
  values on merging control flow (the MachineVerifier missed most of
  these cases).
- Move constructMainRangeFromSubranges() to LiveIntervalAnalysis and
  LiveRangeCalc to better match the implementation/available helper
  functions.

llvm-svn: 269016
 2016-05-10 04:51:14 +00:00