llvm-project

Commit Graph

Author	SHA1	Message	Date
David Majnemer	d28edfea03	Minimize test case further No functional change intended. llvm-svn: 221237	2014-11-04 05:17:58 +00:00
David Majnemer	7e2b9882b1	InstCombine: Remove infinite loop caused by FoldOpIntoPhi FoldOpIntoPhi could create an infinite loop if the PHI could potentially reach a BB it was considering inserting instructions into. The instructions it would insert would eventually lead to other combines firing which would, again, lead to FoldOpIntoPhi firing. The solution is to handicap FoldOpIntoPhi so that it doesn't attempt to insert instructions that the PHI might reach. This fixes PR21377. llvm-svn: 221187	2014-11-03 21:55:12 +00:00
Michael Ilseman	e2754dc887	Add back FoldOpIntoPhi optimizations with fix. Included test cases to help catch these errors and to test the presence of the optimization itself llvm-svn: 170248	2012-12-14 22:08:26 +00:00

Author

SHA1

Message

Date

David Majnemer

d28edfea03

Minimize test case further

No functional change intended.

llvm-svn: 221237

2014-11-04 05:17:58 +00:00

David Majnemer

7e2b9882b1

InstCombine: Remove infinite loop caused by FoldOpIntoPhi

FoldOpIntoPhi could create an infinite loop if the PHI could potentially
reach a BB it was considering inserting instructions into.  The
instructions it would insert would eventually lead to other combines
firing which would, again, lead to FoldOpIntoPhi firing.

The solution is to handicap FoldOpIntoPhi so that it doesn't attempt to
insert instructions that the PHI might reach.

This fixes PR21377.

llvm-svn: 221187

2014-11-03 21:55:12 +00:00

Michael Ilseman

e2754dc887

Add back FoldOpIntoPhi optimizations with fix. Included test cases to help catch these errors and to test the presence of the optimization itself

llvm-svn: 170248

2012-12-14 22:08:26 +00:00

3 Commits