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diff --git a/test/MC/AArch64/SVE/brkas-diagnostics.s b/test/MC/AArch64/SVE/brkas-diagnostics.s
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+++ b/test/MC/AArch64/SVE/brkas-diagnostics.s
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+// RUN: not llvm-mc -triple=aarch64 -show-encoding -mattr=+sve 2>&1 < %s| FileCheck %s
+
+
+// ------------------------------------------------------------------------- //
+// Only .b is supported
+
+brkas p0.s, p15/z, p15.s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid predicate register
+// CHECK-NEXT: brkas p0.s, p15/z, p15.s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+
+// ------------------------------------------------------------------------- //
+// flag-setting variant does not have merging predication
+
+brkas p0.b, p15/m, p15.b
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand
+// CHECK-NEXT: brkas p0.b, p15/m, p15.b
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}: