llvm-project

Commit Graph

Author	SHA1	Message	Date
Craig Topper	3ad8fbd205	[Reassociate] Teach ConvertShiftToMul to preserve nsw flag if the shift amount is not bitwidth - 1. Multiply and shl have different signed overflow behavior in some cases. But it looks like we should be ok as long as the shift amount is less than bitwidth - 1. Alive2: http://volta.cs.utah.edu:8080/z/MM4WZP Differential Revision: https://reviews.llvm.org/D81189	2020-06-04 14:51:34 -07:00
Philip Reames	2264f96c2a	[Tests] Autogen a bunch of Reassociate tests for ease of update llvm-svn: 367634	2019-08-01 23:30:32 +00:00
Eric Christopher	cee313d288	Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552	2019-04-17 04:52:47 +00:00
Eric Christopher	a863435128	Temporarily Revert "Add basic loop fusion pass." As it's causing some bot failures (and per request from kbarton). This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda. llvm-svn: 358546	2019-04-17 02:12:23 +00:00
David Majnemer	f6e500a0dc	[Reassociate] Don't propogate flags when creating negations Reassociate mutated existing instructions in order to form negations which would create additional reassociate opportunities. This fixes PR23926. llvm-svn: 240593	2015-06-24 21:27:36 +00:00
Chad Rosier	094ac7735b	[Reassociate] Canonicalize negative constants out of expressions. This is a reapplication of r221171, but we only perform the transformation on expressions which include a multiplication. We do not transform rem/div operations as this doesn't appear to be safe in all cases. llvm-svn: 221721	2014-11-11 22:58:35 +00:00
Chad Rosier	b3eb452e83	[Reassociate] Better preserve NSW/NUW flags. Part of PR12985. Phabricator Revision: http://reviews.llvm.org/D6172 llvm-svn: 221555	2014-11-07 22:12:57 +00:00

7 Commits