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Author SHA1 Message Date
Sanjoy Das b864c1f76f [SCEV] Look at backedge dominating conditions (re-land r233447). 
Summary:
This change teaches ScalarEvolution::isLoopBackedgeGuardedByCond to look
at edges within the loop body that dominate the latch.  We don't do an
exhaustive search for all possible edges, but only a quick walk up the
dom tree.

This re-lands r233447.  r233447 was reverted because it caused massive
compile-time regressions.  This change has a fix for the same issue.

llvm-svn: 233829
 2015-04-01 18:24:06 +00:00
Daniel Jasper 87e848c7dc Revert "[SCEV] Look at backedge dominating conditions." 
This leads to terribly slow compile times under MSAN. More discussion
on the commit thread of r233447.

llvm-svn: 233529
 2015-03-30 09:30:02 +00:00
Sanjoy Das fe0e0fff92 [SCEV] Look at backedge dominating conditions. 
Summary:
This change teaches ScalarEvolution::isLoopBackedgeGuardedByCond to look
at edges within the loop body that dominate the latch.  We don't do an
exhaustive search for all possible edges, but only a quick walk up the
dom tree.

Reviewers: atrick, hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8627

llvm-svn: 233447
 2015-03-27 23:18:08 +00:00