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3 Commits

Author SHA1 Message Date
Serguei Katkov ec7029c286 Re-apply [SCEV] Fix isLoopEntryGuardedByCond usage 
ScalarEvolution::isKnownPredicate invokes isLoopEntryGuardedByCond without check
that SCEV is available at entry point of the loop. It is incorrect and fixed by patch.

To bugs additionally fixed:
assert is moved after the check whether loop is not a nullptr.
Usage of isLoopEntryGuardedByCond in ScalarEvolution::isImpliedCondOperandsViaNoOverflow
is guarded by isAvailableAtLoopEntry.

Reviewers: sanjoy, mkazantsev, anna, dorit, reames
Reviewed By: mkazantsev
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D42417

llvm-svn: 324204
 2018-02-05 05:49:47 +00:00
Serguei Katkov f38041dc3e Revert [SCEV] Fix isLoopEntryGuardedByCond usage 
It causes buildbot failures. New added assert is fired.
It seems not all usages of isLoopEntryGuardedByCond are fixed.

llvm-svn: 323079
 2018-01-22 07:47:02 +00:00
Serguei Katkov 50714a1cbc [SCEV] Fix isLoopEntryGuardedByCond usage 
ScalarEvolution::isKnownPredicate invokes isLoopEntryGuardedByCond without check
that SCEV is available at entry point of the loop. It is incorrect and fixed by patch.

Reviewers: sanjoy, mkazantsev, anna, dorit
Reviewed By: mkazantsev
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D42165

llvm-svn: 323077
 2018-01-22 07:31:41 +00:00