Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/MC/AArch64/directive-arch-negative.s

@@ -0,0 +1,57 @@
+// RUN: not llvm-mc -triple aarch64-unknown-none-eabi -filetype asm -o - %s 2>&1 | FileCheck %s
+
+	.arch axp64
+# CHECK: error: unknown arch name
+# CHECK: 	.arch axp64
+# CHECK:	      ^
+
+	.arch armv8
+	aese v0.8h, v1.8h
+
+# CHECK: error: invalid operand for instruction
+# CHECK: 	aese v0.8h, v1.8h
+# CHECK:	^
+
+// We silently ignore invalid features.
+	.arch armv8+foo
+	aese v0.8h, v1.8h
+
+# CHECK: error: invalid operand for instruction
+# CHECK:	aese v0.8h, v1.8h
+# CHECK:	^
+
+	.arch armv8+crypto
+
+	.arch armv8
+
+	aese v0.8h, v1.8h
+
+# CHECK: error: invalid operand for instruction
+# CHECK: 	aese v0.8h, v1.8h
+# CHECK:	^
+
+	.arch armv8.1-a+noras
+	esb
+
+# CHECK: error: instruction requires: ras
+# CHECK:         esb
+
+// PR32873: without extra features, '.arch' is currently ignored.
+// Add an unrelated feature to accept the directive.
+	.arch armv8+crc
+        casa  w5, w7, [x19]
+
+# CHECK: error: instruction requires: lse
+# CHECK:        casa  w5, w7, [x19]
+
+	.arch armv8+crypto
+        crc32b w0, w1, w2
+
+# CHECK: error: instruction requires: crc
+# CHECK:        crc32b w0, w1, w2
+
+	.arch armv8.1-a+nolse
+        casa  w5, w7, [x20]
+
+# CHECK: error: instruction requires: lse
+# CHECK:        casa  w5, w7, [x20]