[PatternMatch] Add m_Store pattern match helper

Differential Revision: https://reviews.llvm.org/D48279

llvm-svn: 335100

2 files changed, 63 insertions, 0 deletions

diff --git a/llvm/include/llvm/IR/PatternMatch.h b/llvm/include/llvm/IR/PatternMatch.h
index dcca931b16d..191aa958a98 100644
--- a/llvm/include/llvm/IR/PatternMatch.h
+++ b/llvm/include/llvm/IR/PatternMatch.h
@@ -1193,6 +1193,33 @@ template <typename OpTy> inline LoadClass_match<OpTy> m_Load(const OpTy &Op) {
 }
 
 //===----------------------------------------------------------------------===//
+// Matcher for StoreInst classes
+//
+
+template <typename ValueOp_t, typename PointerOp_t> struct StoreClass_match {
+  ValueOp_t ValueOp;
+  PointerOp_t PointerOp;
+
+  StoreClass_match(const ValueOp_t &ValueOpMatch,
+                   const PointerOp_t &PointerOpMatch) :
+    ValueOp(ValueOpMatch), PointerOp(PointerOpMatch)  {}
+
+  template <typename OpTy> bool match(OpTy *V) {
+    if (auto *LI = dyn_cast<StoreInst>(V))
+      return ValueOp.match(LI->getValueOperand()) &&
+             PointerOp.match(LI->getPointerOperand());
+    return false;
+  }
+};
+
+/// Matches StoreInst.
+template <typename ValueOpTy, typename PointerOpTy>
+inline StoreClass_match<ValueOpTy, PointerOpTy>
+m_Store(const ValueOpTy &ValueOp, const PointerOpTy &PointerOp) {
+  return StoreClass_match<ValueOpTy, PointerOpTy>(ValueOp, PointerOp);
+}
+
+//===----------------------------------------------------------------------===//
 // Matchers for unary operators
 //
 
diff --git a/llvm/unittests/IR/PatternMatch.cpp b/llvm/unittests/IR/PatternMatch.cpp
index 2c6da22298f..6b5686d53c6 100644
--- a/llvm/unittests/IR/PatternMatch.cpp
+++ b/llvm/unittests/IR/PatternMatch.cpp
@@ -390,6 +390,42 @@ TEST_F(PatternMatchTest, OverflowingBinOps) {
   EXPECT_FALSE(m_NUWShl(m_Value(), m_Value()).match(IRB.CreateNUWAdd(L, R)));
 }
 
+TEST_F(PatternMatchTest, LoadStoreOps) {
+  // Create this load/store sequence:
+  //
+  //  %p = alloca i32*
+  //  %0 = load i32*, i32** %p
+  //  store i32 42, i32* %0
+
+  Value *Alloca = IRB.CreateAlloca(IRB.getInt32Ty());
+  Value *LoadInst = IRB.CreateLoad(Alloca);
+  Value *FourtyTwo = IRB.getInt32(42);
+  Value *StoreInst = IRB.CreateStore(FourtyTwo, Alloca);
+  Value *MatchLoad, *MatchStoreVal, *MatchStorePointer;
+
+  EXPECT_TRUE(m_Load(m_Value(MatchLoad)).match(LoadInst));
+  EXPECT_EQ(Alloca, MatchLoad);
+
+  EXPECT_TRUE(m_Load(m_Specific(Alloca)).match(LoadInst));
+
+  EXPECT_FALSE(m_Load(m_Value(MatchLoad)).match(Alloca));
+
+  EXPECT_TRUE(m_Store(m_Value(MatchStoreVal), m_Value(MatchStorePointer))
+                .match(StoreInst));
+  EXPECT_EQ(FourtyTwo, MatchStoreVal);
+  EXPECT_EQ(Alloca, MatchStorePointer);
+
+  EXPECT_FALSE(m_Store(m_Value(MatchStoreVal), m_Value(MatchStorePointer))
+                .match(Alloca));
+
+  EXPECT_TRUE(m_Store(m_SpecificInt(42), m_Specific(Alloca))
+                .match(StoreInst));
+  EXPECT_FALSE(m_Store(m_SpecificInt(42), m_Specific(FourtyTwo))
+                .match(StoreInst));
+  EXPECT_FALSE(m_Store(m_SpecificInt(43), m_Specific(Alloca))
+                .match(StoreInst));
+}
+
 TEST_F(PatternMatchTest, VectorOps) {
   // Build up small tree of vector operations
   //