[IR][PatternMatch] Introduce m_NegatedPower2() matcher
Summary:
It is a good idea to do as much matching inside of `match()` as possible.
If some checking is done afterwards, and we don't fold because of it,
chances are we may have missed some commutative pattern.
Reviewers: spatel, craig.topper, RKSimon
Reviewed By: spatel, RKSimon
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D64038
llvm-svn: 367017
diff --git a/llvm/unittests/IR/PatternMatch.cpp b/llvm/unittests/IR/PatternMatch.cpp
index 8263acb..fe8c518 100644
--- a/llvm/unittests/IR/PatternMatch.cpp
+++ b/llvm/unittests/IR/PatternMatch.cpp
@@ -7,6 +7,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/IR/PatternMatch.h"
+#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/BasicBlock.h"
@@ -470,6 +471,26 @@
EXPECT_FALSE(m_Unless(m_c_Add(m_Zero(), m_One())).match(X));
}
+TEST_F(PatternMatchTest, Power2) {
+ Value *C128 = IRB.getInt32(128);
+ Value *CNeg128 = ConstantExpr::getNeg(cast<Constant>(C128));
+
+ EXPECT_TRUE(m_Power2().match(C128));
+ EXPECT_FALSE(m_Power2().match(CNeg128));
+
+ EXPECT_FALSE(m_NegatedPower2().match(C128));
+ EXPECT_TRUE(m_NegatedPower2().match(CNeg128));
+
+ Value *CIntMin = IRB.getInt64(APSInt::getSignedMinValue(64).getSExtValue());
+ Value *CNegIntMin = ConstantExpr::getNeg(cast<Constant>(CIntMin));
+
+ EXPECT_TRUE(m_Power2().match(CIntMin));
+ EXPECT_TRUE(m_Power2().match(CNegIntMin));
+
+ EXPECT_TRUE(m_NegatedPower2().match(CIntMin));
+ EXPECT_TRUE(m_NegatedPower2().match(CNegIntMin));
+}
+
TEST_F(PatternMatchTest, CommutativeDeferredValue) {
Value *X = IRB.getInt32(1);
Value *Y = IRB.getInt32(2);