Commit Graph

12 Commits

Author SHA1 Message Date
Sanjay Patel 962a8431ea [InstSimplify] allow folds for bool vector div/rem
llvm-svn: 297411
2017-03-09 21:56:03 +00:00
Sanjay Patel 7e56366204 [ConstantFold] vector div/rem with any zero element in divisor is undef
Follow-up for:
https://reviews.llvm.org/D30665
https://reviews.llvm.org/rL297390

llvm-svn: 297409
2017-03-09 20:42:30 +00:00
Sanjay Patel bb47616aef [InstSimplify] add tests for vector constant folding div/rem-by-0; NFC
llvm-svn: 297407
2017-03-09 20:31:20 +00:00
Sanjay Patel 2b1f6f4b92 [InstSimplify] vector div/rem with any zero element in divisor is undef
This was suggested as a DAG simplification in the review for rL297026 :
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20170306/435253.html
...but let's start with IR since we have actual docs for IR (LangRef).

Differential Revision:
https://reviews.llvm.org/D30665

llvm-svn: 297390
2017-03-09 16:20:52 +00:00
Sanjay Patel 3bbee79d9e [InstSimplify] add tests for vector div/rem with UB potential; NFC
llvm-svn: 297048
2017-03-06 18:45:39 +00:00
Sanjay Patel c494239bd8 [InstSimplify] regenerate checks; NFC
llvm-svn: 297040
2017-03-06 18:13:01 +00:00
David Majnemer 8c0e62f507 [InstSimplify] Optimize away urems in the presence of range metadata
We know that urem %V, C can be optimized away to %V if %V is ult C.

llvm-svn: 291282
2017-01-06 21:23:51 +00:00
Sanjay Patel 69632447b1 [InstSimplify] regenerate checks using a script
I didn't notice any significant changes in the actual checks here;
all of these tests already used FileCheck, so a script can batch
update them in one shot.

This commit is just to show the value of automating this process: 
We have uniform formatting as opposed to a mish-mash of check
structure that changes based on individual prefs and the current
fashion. This makes it simpler to update when we find a bug or
make an enhancement.

llvm-svn: 264457
2016-03-25 20:12:25 +00:00
David Majnemer b435a4214e InstSimplify: Don't allow (x srem y) urem y -> x srem y
Let's consider the case where:
%x i16 = 32768
%y i16 = 384

%x srem %y = 65408
(%x srem %y) urem %y = 128

llvm-svn: 217939
2014-09-17 04:16:35 +00:00
David Majnemer ac717f0972 InstSimplify: ((X % Y) % Y) -> (X % Y)
Patch by Sonam Kumari!

Differential Revision: http://reviews.llvm.org/D5350

llvm-svn: 217937
2014-09-17 03:34:34 +00:00
Stephen Lin c1c7a1309c Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.
This update was done with the following bash script:

  find test/Transforms -name "*.ll" | \
  while read NAME; do
    echo "$NAME"
    if ! grep -q "^; *RUN: *llc" $NAME; then
      TEMP=`mktemp -t temp`
      cp $NAME $TEMP
      sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \
      while read FUNC; do
        sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP
      done
      mv $TEMP $NAME
    fi
  done

llvm-svn: 186268
2013-07-14 01:42:54 +00:00
Duncan Sands a3e3699c88 Move some rem transforms out of instcombine and into instsimplify.
This automagically provides a transform noticed by my super-optimizer
as occurring quite often: "rem x, (select cond, x, 1)" -> 0.

llvm-svn: 130694
2011-05-02 16:27:02 +00:00