6 Commits

Author SHA1 Message Date
Sanjay Patel
f5a8ebbd97 [SimplifyCFG] eliminate switch cases based on known range of switch condition
This was noted in PR24766:
https://llvm.org/bugs/show_bug.cgi?id=24766#c2

We may not know whether the sign bit(s) are zero or one, but we can still
optimize based on knowing that the sign bit is repeated.

Differential Revision: http://reviews.llvm.org/D20275



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270222 91177308-0d34-0410-b5e6-96231b3b80d8
2016-05-20 14:53:09 +00:00
Sanjay Patel
f081becca9 add test to show missing optimization
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269601 91177308-0d34-0410-b5e6-96231b3b80d8
2016-05-15 18:41:18 +00:00
Sanjay Patel
7f7fd2a1c8 regenerate checks
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269596 91177308-0d34-0410-b5e6-96231b3b80d8
2016-05-15 18:05:10 +00:00
Stephen Lin
39f4e8d9cc 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186268 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-14 01:42:54 +00:00
Dan Gohman
3b205175ea Fix SpeculativelyExecuteBB to either speculate all or none of the phis
present in the bottom of the CFG triangle, as the transformation isn't
ever valuable if the branch can't be eliminated.

Also, unify some heuristics between SimplifyCFG's multiple
if-converters, for consistency.

This fixes rdar://10627242.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147630 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-05 23:58:56 +00:00
Benjamin Kramer
10fcfb53fd SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131345 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-14 15:57:25 +00:00