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3 Commits

Author SHA1 Message Date
Chad Rosier
e2cbd13e56 [ValueTracking] Improve isImpliedCondition when the dominating cond is false. 
llvm-svn: 267430
 2016-04-25 17:23:36 +00:00
Chad Rosier
b7dfbb40a3 [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

llvm-svn: 266767
 2016-04-19 17:19:14 +00:00
Sanjoy Das
13e63a2f21 [JumpThreading] Use dominating conditions to prove implications 
Summary:
If P branches to Q conditional on C and Q branches to R conditional on
C' and C => C' then the branch conditional on C' can be folded to an
unconditional branch.

Reviewers: reames

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13972

llvm-svn: 251557
 2015-10-28 21:27:08 +00:00