Index: src/cmd/asm/internal/asm/testdata/arm64error.s
--- src/cmd/asm/internal/asm/testdata/arm64error.s.orig
+++ src/cmd/asm/internal/asm/testdata/arm64error.s
@@ -420,4 +420,5 @@ TEXT errors(SB),$0
 	AESE	V1.B16, V2.B8                                    // ERROR "invalid arrangement"
 	SHA256SU1	V1.S4, V2.B16, V3.S4                     // ERROR "invalid arrangement"
 	SHA1H	V1.B16, V2.B16                                   // ERROR "invalid operands"
+	BTI	PLDL1KEEP					 // ERROR "illegal argument"
 	RET
