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diff --git a/test/MC/AArch64/SVE/whilelo-diagnostics.s b/test/MC/AArch64/SVE/whilelo-diagnostics.s
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index 000000000000..6237a1182d01
--- /dev/null
+++ b/test/MC/AArch64/SVE/whilelo-diagnostics.s
@@ -0,0 +1,20 @@
+// RUN: not llvm-mc -triple=aarch64 -show-encoding -mattr=+sve 2>&1 < %s| FileCheck %s
+
+
+// ------------------------------------------------------------------------- //
+// Invalid scalar registers
+
+whilelo p15.b, xzr, sp
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: whilelo p15.b, xzr, sp
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+whilelo p15.b, xzr, w0
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: whilelo p15.b, xzr, w0
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+whilelo p15.b, w0, x0
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: whilelo p15.b, w0, x0
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}: