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3 Commits

Author SHA1 Message Date
Dan Gohman 7cac95778f Make SCEVUnknown a CallbackVH, so that it can be notified directly 
of Value deletions and RAUWs, instead of relying on ScalarEvolution's
Scalars map being notified, as that's complicated at best, and
insufficient in general.

This means SCEVUnknown needs a non-trivial destructor, so introduce
a mechanism to allow ScalarEvolution to locate all the SCEVUnknowns.

llvm-svn: 110086
 2010-08-02 23:49:30 +00:00
Eric Christopher ef6d5933a6 Speculatively revert r109705 since it seems to be causing some build bot 
angst.

llvm-svn: 109718
 2010-07-29 01:25:38 +00:00
Dan Gohman 3d6ac44d96 Factor out some of the code for updating old SCEVUnknown values, and 
extend it to handle the case where multiple RAUWs affect a single
SCEVUnknown.

Add a ScalarEvolution unittest to test for this situation.

llvm-svn: 109705
 2010-07-29 00:17:55 +00:00