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6 Commits

Author SHA1 Message Date
Chad Rosier
82f582e20e Fix typo from r267432. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267436 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-25 18:20:27 +00:00
Chad Rosier
cf9b63d0e4 [ValueTracking] Add an additional test case for r266767 where one operand is a const. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267432 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-25 17:41:48 +00:00
Chad Rosier
6d282e5efc [SimplifyCFG] Add final missing implications to isImpliedTrueByMatchingCmp. 
Summary: eq imply [u|s]ge and [u|s]le are true.

Remove redundant logic by implementing isImpliedFalseByMatchingCmp(Pred1, Pred2)
as isImpliedTrueByMatchingCmp(Pred1, getInversePredicate(Pred2)).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267177 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-22 17:57:34 +00:00
Chad Rosier
14f36d715b [SimplifyCFG] Add missing implications to isImpliedTrueByMatchingCmp. 
Summary: [u|s]gt and [u|s]lt imply [u|s]ge and [u|s]le are true, respectively.
I've simplified the existing tests and added additional tests to cover the new
cases mentioned above.  I've also added tests for all the cases where the
first compare doesn't imply anything about the second compare.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267171 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-22 17:14:12 +00:00
Chad Rosier
41b3dd1ad5 [SimplifyCFG] Simplify code review by temporarily removing this test file. 
A followup commit will replace these tests with simplified and more inclusive
tests.  The diff is unreadable if this were to be done in a single commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267170 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-22 17:14:08 +00:00
Chad Rosier
2974be9d8b [ValueTracking] Improve isImpliedCondition for conditions with matching operands. 
This patch improves SimplifyCFG to catch cases like:

  if (a < b) {
    if (a > b) <- known to be false
      unreachable;
  }

Phabricator Revision: http://reviews.llvm.org/D18905

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266767 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-19 17:19:14 +00:00