[llvm] eb1a80b - [DAG] Implement SDPatternMatch `m_SpecificScalarVT` and `m_SpecificVectorElementVT` matchers (#144996)

[via llvm-commits]

Author: zhaohui
Date: 2025-06-30T13:26:00+01:00
New Revision: eb1a80bfd3a07e1d771c1d322ed377254afc5f2e

URL: https://github.com/llvm/llvm-project/commit/eb1a80bfd3a07e1d771c1d322ed377254afc5f2e
DIFF: https://github.com/llvm/llvm-project/commit/eb1a80bfd3a07e1d771c1d322ed377254afc5f2e.diff

LOG: [DAG] Implement SDPatternMatch `m_SpecificScalarVT` and `m_SpecificVectorElementVT` matchers (#144996)

Resolves https://github.com/llvm/llvm-project/issues/144477

---------

Co-authored-by: Simon Pilgrim <llvm-dev at redking.me.uk>

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/SDPatternMatch.h
    llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp

Removed: 
    


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diff  --git a/llvm/include/llvm/CodeGen/SDPatternMatch.h b/llvm/include/llvm/CodeGen/SDPatternMatch.h
index 83187b4a0241c..35322c32a8283 100644
--- a/llvm/include/llvm/CodeGen/SDPatternMatch.h
+++ b/llvm/include/llvm/CodeGen/SDPatternMatch.h
@@ -294,6 +294,34 @@ 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};

diff  --git a/llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp b/llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp
index a60b87c80a02c..baee2868d2d60 100644
--- a/llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp
+++ b/llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp
@@ -110,6 +110,14 @@ TEST_F(SelectionDAGPatternMatchTest, matchValueType) {
 
   using namespace SDPatternMatch;
   EXPECT_TRUE(sd_match(Op0, m_SpecificVT(Int32VT)));
+  EXPECT_TRUE(sd_match(Op0, m_SpecificScalarVT(Int32VT)));
+  EXPECT_TRUE(sd_match(Op0, m_SpecificScalarVT(Int32VT, m_Value())));
+  EXPECT_FALSE(sd_match(Op0, m_SpecificScalarVT(Float32VT)));
+  EXPECT_FALSE(sd_match(Op0, m_SpecificScalarVT(Float32VT, m_Value())));
+  EXPECT_TRUE(sd_match(Op2, m_SpecificVectorElementVT(Int32VT)));
+  EXPECT_TRUE(sd_match(Op2, m_SpecificVectorElementVT(Int32VT, m_Value())));
+  EXPECT_FALSE(sd_match(Op2, m_SpecificVectorElementVT(Float32VT)));
+  EXPECT_FALSE(sd_match(Op2, m_SpecificVectorElementVT(Float32VT, m_Value())));
   EVT BindVT;
   EXPECT_TRUE(sd_match(Op1, m_VT(BindVT)));
   EXPECT_EQ(BindVT, Float32VT);