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4 Commits

Author SHA1 Message Date
Dan Gohman 154ed49784 Fix reassociate to postpone certain instruction deletions until 
after it has finished all of its reassociations, because its
habit of unlinking operands and holding them in a datastructure
while working means that it's not easy to determine when an
instruction is really dead until after all its regular work is
done. rdar://9096268.

llvm-svn: 127424
 2011-03-10 19:51:54 +00:00
Chris Lattner c6c1523f59 fix a nice subtle reassociate bug which would only occur 
in a very specific use pattern embodied in the carefully
reduced testcase.

llvm-svn: 97794
 2010-03-05 07:18:54 +00:00
Chris Lattner ab7087ad66 only factor from expressions whose uses are empty and whose 
base is the right expression type.  This fixes PR5981.

llvm-svn: 93045
 2010-01-09 06:01:36 +00:00
Chris Lattner f741d72b84 fix an infinite loop in reassociate building emacs. 
llvm-svn: 92679
 2010-01-05 04:55:35 +00:00