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5 Commits

Author SHA1 Message Date
Andrew Trick 74111ee07f Reapply r139759. Disable IV rewriting by default. See PR10916. 
llvm-svn: 139842
 2011-09-15 20:58:37 +00:00
Andrew Trick f9f68b816b [indvars] Revert r139579 until 401.bzip -arch i386 miscompilation is fixed. PR10920. 
llvm-svn: 139583
 2011-09-13 05:23:49 +00:00
Andrew Trick 061d811c51 Disable IV rewriting by default. See PR10916. 
llvm-svn: 139579
 2011-09-13 03:23:21 +00:00
Andrew Trick 4a31ba3bae -unroll-scev flag removal 
llvm-svn: 139010
 2011-09-02 17:36:14 +00:00
Andrew Trick 2b6860f0a1 Allow loop unrolling to get known trip counts from ScalarEvolution. 
SCEV unrolling can unroll loops with arbitrary induction variables. It
is a prerequisite for -disable-iv-rewrite performance. It is also
easily handles loops of arbitrary structure including multiple exits
and is generally more robust.

This is under a temporary option to avoid affecting default
behavior for the next couple of weeks. It is needed so that I can
checkin unit tests for updateUnloop.

llvm-svn: 137384
 2011-08-11 23:36:16 +00:00