[llvm] [SDPatternMatch] Add matchers m_ExtractSubvector and m_InsertSubvector (PR #120212)

[Min-Yih Hsu via llvm-commits]

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@@ -182,15 +188,34 @@ TEST_F(SelectionDAGPatternMatchTest, matchTernaryOp) {
   EXPECT_TRUE(sd_match(ExtractELT, m_ExtractElt(m_Value(), m_Value())));
   EXPECT_TRUE(sd_match(ExtractELT, m_ExtractElt(m_Value(), m_ConstInt())));
   EXPECT_TRUE(sd_match(ExtractELT, m_ExtractElt(m_Value(), m_SpecificInt(1))));
+
+  EXPECT_TRUE(sd_match(InsertSubvector,
+                       m_InsertSubvector(m_Value(), m_Value(), m_Value())));
+  EXPECT_TRUE(sd_match(
+      InsertSubvector,
+      m_InsertSubvector(m_Specific(V2), m_Specific(V3), m_Specific(Idx0))));
+  EXPECT_TRUE(sd_match(
+      InsertSubvector,
+      m_InsertSubvector(m_Specific(V2), m_Specific(V3), m_SpecificInt(0))));
+  EXPECT_FALSE(sd_match(
+      InsertSubvector,
+      m_InsertSubvector(m_Specific(V2), m_Specific(V3), m_Specific(Idx3))));
+  EXPECT_FALSE(sd_match(
+      InsertSubvector,
+      m_InsertSubvector(m_Specific(V2), m_Specific(V3), m_SpecificInt(3))));
+
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mshockwave wrote:

@cheezeburglar could you remove this empty line to make clang-format happy? 

https://github.com/llvm/llvm-project/pull/120212