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Author SHA1 Message Date
David Majnemer c5601df9fd Reapply "[LoopIdiom] Don't remove dead operands manually" 
This reverts commit r273160, reapplying r273132.
RecursivelyDeleteTriviallyDeadInstructions cannot be called on a
parentless Instruction.

llvm-svn: 273162
 2016-06-20 16:03:25 +00:00
Cong Liu 1c28b6d733 Revert "[LoopIdiom] Don't remove dead operands manually" 
This reverts commit r273132.
Breaks multiple test under /llvm/test:Transforms (e.g.
llvm/test:Transforms/LoopIdiom/basic.ll.test) under asan.

llvm-svn: 273160
 2016-06-20 15:22:15 +00:00
David Majnemer a705843f23 [LoopIdiom] Don't remove dead operands manually 
Removing dead instructions requires remembering which operands have
already been removed.  RecursivelyDeleteTriviallyDeadInstructions has
this logic, don't partially reimplement it in LoopIdiomRecognize.

This fixes PR28196.

llvm-svn: 273132
 2016-06-20 02:33:29 +00:00