diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -5304,6 +5304,14 @@
                            "is also a destination");
     [[fallthrough]];
   }
+  case AArch64::LDR_ZA:
+  case AArch64::STR_ZA: {
+    if (Inst.getOperand(2).isImm() && Inst.getOperand(4).isImm() &&
+        Inst.getOperand(2).getImm() != Inst.getOperand(4).getImm())
+      return Error(Loc[1],
+                   "unpredictable instruction, immediate and offset mismatch.");
+    break;
+  }
   case AArch64::LDPDi:
   case AArch64::LDPQi:
   case AArch64::LDPSi:
diff --git a/llvm/test/MC/AArch64/SME/ldr-diagnostics.s b/llvm/test/MC/AArch64/SME/ldr-diagnostics.s
--- a/llvm/test/MC/AArch64/SME/ldr-diagnostics.s
+++ b/llvm/test/MC/AArch64/SME/ldr-diagnostics.s
@@ -51,3 +51,10 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
 // CHECK-NEXT: ldr za[w12, #0], [x0, #0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+// ------------------------------------------------------------------------- //
+// Mismatch between offset and immediate
+ldr     za[w14, 6], [x10, #5, mul vl]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: unpredictable instruction, immediate and offset mismatch.
+// CHECK-NEXT: ldr     za[w14, 6], [x10, #5, mul vl]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
diff --git a/llvm/test/MC/AArch64/SME/str-diagnostics.s b/llvm/test/MC/AArch64/SME/str-diagnostics.s
--- a/llvm/test/MC/AArch64/SME/str-diagnostics.s
+++ b/llvm/test/MC/AArch64/SME/str-diagnostics.s
@@ -51,3 +51,10 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
 // CHECK-NEXT: str za[w12, #0], [x0, #0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+// ------------------------------------------------------------------------- //
+// Mismatch between offset and immediate
+str     za[w14, 6], [x10, #5, mul vl]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: unpredictable instruction, immediate and offset mismatch.
+// CHECK-NEXT: str     za[w14, 6], [x10, #5, mul vl]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}: