[DAG] Implement SDPatternMatch m_SpecificScalarVT and m_SpecificVectorElementVT matchers

Author: zhaohuiw42

llvm/include/llvm/CodeGen/SDPatternMatch.h

@@ -277,6 +277,34 @@ inline auto m_SpecificVT(EVT RefVT) {
 inline auto m_Glue() { return m_SpecificVT(MVT::Glue); }
 inline auto m_OtherVT() { return m_SpecificVT(MVT::Other); }
 
+/// Match a scalar ValueType.
+template <typename Pattern>
+inline auto m_SpecificScalarVT(EVT RefVT, const Pattern &P) {
+  return ValueType_match{[=](EVT VT) { return VT.getScalarType() == RefVT; },
+                         P};
+}
+inline auto m_SpecificScalarVT(EVT RefVT) {
+  return ValueType_match{[=](EVT VT) { return VT.getScalarType() == RefVT; },
+                         m_Value()};
+}
+
+/// Match a vector ValueType.
+template <typename Pattern>
+inline auto m_SpecificVectorElementVT(EVT RefVT, const Pattern &P) {
+  return ValueType_match{[=](EVT VT) {
+                           return VT.isVector() &&
+                                  VT.getVectorElementType() == RefVT;
+                         },
+                         P};
+}
+inline auto m_SpecificVectorElementVT(EVT RefVT) {
+  return ValueType_match{[=](EVT VT) {
+                           return VT.isVector() &&
+                                  VT.getVectorElementType() == RefVT;
+                         },
+                         m_Value()};
+}
+
 /// Match any integer ValueTypes.
 template <typename Pattern> inline auto m_IntegerVT(const Pattern &P) {
   return ValueType_match{[](EVT VT) { return VT.isInteger(); }, P};

llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp

@@ -110,6 +110,10 @@ TEST_F(SelectionDAGPatternMatchTest, matchValueType) {
 
   using namespace SDPatternMatch;
   EXPECT_TRUE(sd_match(Op0, m_SpecificVT(Int32VT)));
+  EXPECT_TRUE(sd_match(Op0, m_SpecificScalarVT(Int32VT)));
+  EXPECT_FALSE(sd_match(Op0, m_SpecificScalarVT(Float32VT)));
+  EXPECT_TRUE(sd_match(Op2, m_SpecificVectorElementVT(Int32VT)));
+  EXPECT_FALSE(sd_match(Op2, m_SpecificVectorElementVT(Float32VT)));
   EVT BindVT;
   EXPECT_TRUE(sd_match(Op1, m_VT(BindVT)));
   EXPECT_EQ(BindVT, Float32VT);