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Author SHA1 Message Date
Sanjay Patel 0cf0be993c [InstCombine] fix operands of shouldChangeType() for casted phi transform 
This is a bug noted in the recent D72733 and seen
in the similar transform just above the changed source code.

I added tests with illegal types and zexts to show the bug -
we could transform legal phi ops to illegal, etc. I did not add
tests with trunc because we won't see any diffs on those patterns.
That is because InstCombiner::SliceUpIllegalIntegerPHI() appears to
do those transforms independently of datalayout. It can also create
more casts than are present in existing code.

There are some existing regression tests that do not include a
datalayout that would be altered by this fix. I assumed that the
lack of a datalayout in those regression files is an oversight, so
I added the minimal layout (make i32 legal) necessary to preserve
behavior on those tests.

Differential Revision: https://reviews.llvm.org/D73907
 2020-02-04 07:45:48 -05:00
Sanjay Patel 80bea345d1 [InstCombine] fold sign-bit compares of srem 
(srem X, pow2C) sgt/slt 0 can be reduced using bit hacks by masking
off the sign bit and the module (low) bits:
https://rise4fun.com/Alive/jSO
A '2' divisor allows slightly more folding:
https://rise4fun.com/Alive/tDBM

Any chance to remove an 'srem' use is probably worthwhile, but this is limited
to the one-use improvement case because doing more may expose other missing
folds. That means it does nothing for PR21929 yet:
https://bugs.llvm.org/show_bug.cgi?id=21929

Differential Revision: https://reviews.llvm.org/D67334

llvm-svn: 371610
 2019-09-11 12:04:26 +00:00
Sanjay Patel 354a46444c [InstCombine] add tests for icmp with srem operand; NFC 
llvm-svn: 371348
 2019-09-08 19:48:47 +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
Sanjay Patel e341c919b0 fix FileCheck variables for test added with r280677 
The script (utils/update_test_checks.py) seems to have problems 
with variable names that start with the same string. 

llvm-svn: 280679
 2016-09-05 23:49:32 +00:00
Sanjay Patel eea2ef7862 [InstCombine] don't assert that division-by-constant has been folded (PR30281) 
This is effectively a revert of:
https://reviews.llvm.org/rL280115

And this should fix
https://llvm.org/bugs/show_bug.cgi?id=30281:

llvm-svn: 280677
 2016-09-05 23:38:22 +00:00