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[IR][PatternMatch] introduce m_Unless() matcher

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Summary:
I don't think it already exists? I don't see it at least.
It is important to have it because else we'll do some checks after `match()`,
and that may result in missed folds in commutative nodes.

Reviewers: spatel, craig.topper, RKSimon, majnemer

Reviewed By: spatel

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64037

llvm-svn: 367016
This commit is contained in:
Roman Lebedev 2019-07-25 13:34:14 +00:00
parent 4e4ee627cd
commit 784d5ec89a
2 changed files with 30 additions and 0 deletions
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14
include/llvm/IR/PatternMatch.h
View File

@ -88,6 +88,20 @@ inline class_match<UndefValue> m_Undef() { return class_match<UndefValue>(); }
/// Match an arbitrary Constant and ignore it.
inline class_match<Constant> m_Constant() { return class_match<Constant>(); }
/// Inverting matcher
template <typename Ty> struct match_unless {
Ty M;
match_unless(const Ty &Matcher) : M(Matcher) {}
template <typename ITy> bool match(ITy *V) { return !M.match(V); }
};
/// Match if the inner matcher does *NOT* match.
template <typename Ty> inline match_unless<Ty> m_Unless(const Ty &M) {
return match_unless<Ty>(M);
}
/// Matching combinators
template <typename LTy, typename RTy> struct match_combine_or {
LTy L;

16
unittests/IR/PatternMatch.cpp
View File

@ -454,6 +454,22 @@ TEST_F(PatternMatchTest, SpecificIntSLE) {
.match(NegOne));
}
TEST_F(PatternMatchTest, Unless) {
Value *X = IRB.CreateAdd(IRB.getInt32(1), IRB.getInt32(0));
EXPECT_TRUE(m_Add(m_One(), m_Zero()).match(X));
EXPECT_FALSE(m_Add(m_Zero(), m_One()).match(X));
EXPECT_FALSE(m_Unless(m_Add(m_One(), m_Zero())).match(X));
EXPECT_TRUE(m_Unless(m_Add(m_Zero(), m_One())).match(X));
EXPECT_TRUE(m_c_Add(m_One(), m_Zero()).match(X));
EXPECT_TRUE(m_c_Add(m_Zero(), m_One()).match(X));
EXPECT_FALSE(m_Unless(m_c_Add(m_One(), m_Zero())).match(X));
EXPECT_FALSE(m_Unless(m_c_Add(m_Zero(), m_One())).match(X));
}
TEST_F(PatternMatchTest, CommutativeDeferredValue) {
Value *X = IRB.getInt32(1);
Value *Y = IRB.getInt32(2);