40e8ca46ad
[InstCombine] use m_APInt to allow icmp (trunc X, Y), C folds for splat constant vectors
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This is a sibling of:
https://reviews.llvm.org/rL278859
https://reviews.llvm.org/rL278935
https://reviews.llvm.org/rL278945
https://reviews.llvm.org/rL279066
https://reviews.llvm.org/rL279077
https://reviews.llvm.org/rL279101
llvm-svn: 279133
2016-08-18 20:28:54 +00:00
63e14a07e8
[InstCombine] use m_APInt to allow icmp (or X, Y), C folds for splat constant vectors
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This is a sibling of:
https://reviews.llvm.org/rL278859
https://reviews.llvm.org/rL278935
llvm-svn: 278945
2016-08-17 16:38:57 +00:00
a7b9bb3785
[InstCombine] add tests for missing vector icmp folds
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llvm-svn: 278683
2016-08-15 17:10:35 +00:00
e466865f67
add tests for missing vector icmp folds
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llvm-svn: 278129
2016-08-09 16:05:57 +00:00
362dcf9615
auto-generate checks
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llvm-svn: 268061
2016-04-29 16:39:37 +00:00
e5f4889ba9
[InstCombine] Optimize icmp slt signum(x), 1 --> icmp slt x, 1
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Summary:
`signum(x)` is sometimes implemented as `(x >> 63) | (-x >>> 63)` (for
an `i64` `x`). This change adds a matcher for that pattern, and an
instcombine rule to optimize `signum(x) s< 1`.
Later, we can also consider optimizing:
icmp slt signum(x), 0 --> icmp slt x, 0
icmp sle signum(x), 1 --> true
etc.
Reviewers: majnemer
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D12703
llvm-svn: 247846
2015-09-16 20:41:29 +00:00
03f3e248eb
InstCombine: fold (A >> C) == (B >> C) --> (A^B) < (1 << C) for constant Cs.
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This is common in bitfield code.
llvm-svn: 194925
2013-11-16 16:00:48 +00:00
c1c7a1309c
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.
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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
d7beca87f5
Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID
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This is done to avoid odd test failures, like the one fixed in r171243.
My previous regex was not good enough to find these.
llvm-svn: 171343
2013-01-01 13:57:25 +00:00
401e6093c9
Fix some CHECK lines which were ignored by accident.
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llvm-svn: 91214
2009-12-12 09:25:50 +00:00
a0e9d700dc
Generalize this optimization to work on equality comparisons between any two
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integers that are constant except for a single bit (the same n-th bit in each).
llvm-svn: 90646
2009-12-05 05:00:00 +00:00
922d4ab574
Reapply r88830 with a bugfix: this transform only applies to icmp eq/ne. This
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fixes part of PR5438.
llvm-svn: 89639
2009-11-23 03:17:33 +00:00
95148689c9
Revert r88830 and r88831 which appear to have caused a selfhost buildbot some
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grief. I suspect this patch merely exposed a bug else.
llvm-svn: 88841
2009-11-15 07:47:32 +00:00
6a6ac7e105
Correct typo.
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llvm-svn: 88831
2009-11-15 06:16:57 +00:00
e29fa4c7a1
Teach instcombine to look for booleans in wider integers when it encounters a
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zext(icmp). It may be able to optimize that away. This fixes one of the cases
in PR5438.
llvm-svn: 88830
2009-11-15 05:55:17 +00:00
Sanjay Patel