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3 Commits

Author SHA1 Message Date
Sanjoy Das b0b4e86215 [SCEV] Don't infinitely recurse on unreachable code 
llvm-svn: 277848
 2016-08-05 18:34:14 +00:00
Sanjoy Das 337d4786e1 [SCEV] Don't create SCEV expressions that break LCSSA 
Prevent `createNodeFromSelectLikePHI` from creating SCEV expressions
that break LCSSA.

A better fix for the same issue is to teach SCEVExpander to not break
LCSSA by inserting PHI nodes at appropriate places.  That's planned for
the future.

Fixes PR25360.

llvm-svn: 251756
 2015-10-31 23:21:40 +00:00
Sanjoy Das 55015d210f [SCEV] Recognize simple br-phi patterns 
Summary:
Teach SCEV to match patterns like

```
  br %cond, label %left, label %right
 left:
  br label %merge
 right:
  br label %merge
 merge:
  V = phi [ %x, %left ], [ %y, %right ]
```

as "select %cond, %x, %y".  Before this SCEV would match PHI nodes
exclusively to add recurrences.

This addresses PR25005.

Reviewers: joker.eph, joker-eph, atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13378

llvm-svn: 249211
 2015-10-02 23:09:44 +00:00