Fix immediates and tests for 1x2 mop4

Author: virginia-cangelosi

clang/include/clang/Basic/arm_sme.td

@@ -294,6 +294,7 @@ defm SVMOPS : ZAFPOuterProd<"mops">;
 
 multiclass MOP4<string mode, string za, string t, string i, list<ImmCheck> checks> {
   def _1x1 : Inst<"svmop4" # mode # "[_1x1]_" # za # "[_{d}_{d}]", "vidd", t, MergeNone, i # "_1x1", [IsInOutZA, IsStreaming], checks>;
+  def _1x2 : Inst<"svmop4" # mode # "[_1x2]_" # za # "[_{d}_{d}]", "vid2", t, MergeNone, i # "_1x2", [IsInOutZA, IsStreaming], checks>;
 }
 
 let SMETargetGuard = "sme2,sme-mop4" in {
@@ -345,13 +346,21 @@ multiclass SUMOP4<string mode, string za, string t, string i, list<ImmCheck> che
                               "vidu", t, MergeNone, "aarch64_sme_sumop4" # mode # i # "_wide_1x1",
                               [IsStreaming, IsInOutZA],
                               checks>;
+  def _1x2 : SInst<"svmop4" # mode # "[_1x2]_" # za # "[_{d}_{3}]",
+                              "vid2.u", t, MergeNone, "aarch64_sme_sumop4" # mode # i # "_wide_1x2",
+                              [IsStreaming, IsInOutZA],
+                              checks>;
 }
 
 multiclass USMOP4<string mode, string za, string t, string i, list<ImmCheck> checks> {
   def _1x1 : SInst<"svmop4" # mode # "[_1x1]_" # za # "[_{d}_{3}]",
                               "vidx", t, MergeNone, "aarch64_sme_usmop4" # mode # i # "_wide_1x1",
                               [IsStreaming, IsInOutZA],
                               checks>;
+  def _1x2 : SInst<"svmop4" # mode # "[_1x2]_" # za # "[_{d}_{3}]",
+                              "vid2.x", t, MergeNone, "aarch64_sme_usmop4" # mode # i # "_wide_1x1",
+                              [IsStreaming, IsInOutZA],
+                              checks>;
 }
 
 let SMETargetGuard = "sme2,sme-mop4" in {