[llvm] [AArch64] Add @llvm.experimental.vector.match (PR #101974)

[David Sherwood via llvm-commits]

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@@ -1892,6 +1892,16 @@ def int_experimental_vector_histogram_add : DefaultAttrsIntrinsic<[],
                                LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>], // Mask
                              [ IntrArgMemOnly ]>;
 
+// Experimental match
+def int_experimental_vector_match : DefaultAttrsIntrinsic<
+                             [ LLVMScalarOrSameVectorWidth<0, llvm_i1_ty> ],
+                             [ llvm_anyvector_ty,
+                               LLVMMatchType<0>,
+                               LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>,  // Mask
+                               llvm_i32_ty ],  // Segment size
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david-arm wrote:

Again, should <segsize> be an immediate value? It's hard to know how we'd generate code for a symbolic value.

https://github.com/llvm/llvm-project/pull/101974