return V;
}
+struct is_negated_power2 {
+ bool isValue(const APInt &C) { return (-C).isPowerOf2(); }
+};
+/// Match a integer or vector negated power-of-2.
+/// For vectors, this includes constants with undefined elements.
+inline cst_pred_ty<is_negated_power2> m_NegatedPower2() {
+ return cst_pred_ty<is_negated_power2>();
+}
+inline api_pred_ty<is_negated_power2> m_NegatedPower2(const APInt *&V) {
+ return V;
+}
+
struct is_power2_or_zero {
bool isValue(const APInt &C) { return !C || C.isPowerOf2(); }
};
//===----------------------------------------------------------------------===//
#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"
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);