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8 Commits

Author SHA1 Message Date
Bjorn Pettersson
0676acb6fd [test] Switch to use -passes syntax in a bunch of test cases 
Should cover most of the tests for GVN, GVNHoist, GVNSink, GlobalOpt,
GlobalSplit, InstCombine, Reassociate, SROA and TailCallElim that
had not been updated earlier.
 2022-11-29 13:29:02 +01:00
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