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diff --git a/test/MC/ARM64/directive_loh.s b/test/MC/ARM64/directive_loh.s
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+++ b/test/MC/ARM64/directive_loh.s
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+# RUN: not llvm-mc -triple arm64-apple-darwin < %s 2> %t | FileCheck %s
+# RUN: FileCheck --check-prefix=CHECK-ERRORS < %t %s
+
+.globl _fct1
+_fct1:
+  L1:
+  L2:
+  L3:
+  L4:
+  ret lr;
+
+# Known LOHs with:
+# - Regular syntax.
+# - Alternative syntax.
+
+# CHECK: .loh AdrpAdrp L1, L2
+# CHECK: .loh AdrpAdrp L1, L2
+.loh AdrpAdrp L1, L2
+.loh 1 L1, L2
+
+# CHECK: .loh AdrpLdr L1, L2
+# CHECK: .loh AdrpLdr L1, L2
+.loh AdrpLdr L1, L2
+.loh 2 L1, L2
+
+# CHECK: .loh AdrpAddLdr L1, L2, L3
+# CHECK: .loh AdrpAddLdr L1, L2, L3
+.loh AdrpAddLdr L1, L2, L3
+.loh 3 L1, L2, L3
+
+# CHECK: .loh AdrpLdrGotLdr L1, L2, L3
+# CHECK: .loh AdrpLdrGotLdr L1, L2, L3
+.loh AdrpLdrGotLdr L1, L2, L3
+.loh 4 L1, L2, L3
+
+# CHECK: .loh AdrpAddStr L1, L2, L3
+# CHECK: .loh AdrpAddStr L1, L2, L3
+.loh AdrpAddStr L1, L2, L3
+.loh 5 L1, L2, L3
+
+# CHECK: .loh AdrpLdrGotStr L1, L2, L3
+# CHECK: .loh AdrpLdrGotStr L1, L2, L3
+.loh AdrpLdrGotStr L1, L2, L3
+.loh 6 L1, L2, L3
+
+# CHECK: .loh AdrpAdd L1, L2
+# CHECK: .loh AdrpAdd L1, L2
+.loh AdrpAdd L1, L2
+.loh 7 L1, L2
+
+# CHECK: .loh AdrpLdrGot L1, L2
+# CHECK: .loh AdrpLdrGot L1, L2
+.loh AdrpLdrGot L1, L2
+.loh 8 L1, L2
+
+# End Known LOHs.
+
+### Errors Check ####
+
+# Unknown textual identifier.
+# CHECK-ERRORS: error: invalid identifier in directive
+# CHECK-ERRORS-NEXT: .loh Unknown
+# CHECK-ERRORS-NEXT:      ^
+.loh Unknown
+# Unknown numeric identifier.
+# CHECK-ERRORS: error: invalid numeric identifier in directive
+# CHECK-ERRORS-NEXT: .loh 153, L1
+# CHECK-ERRORS-NEXT:      ^
+.loh 153, L1
+
+# Too much arguments.
+# CHECK-ERRORS: error: unexpected token in '.loh' directive
+# CHECK-ERRORS-NEXT: .loh AdrpAdrp L1, L2, L3
+# CHECK-ERRORS-NEXT:                     ^
+.loh AdrpAdrp L1, L2, L3
+
+# Too much arguments with alternative syntax.
+# CHECK-ERRORS: error: unexpected token in '.loh' directive
+# CHECK-ERRORS-NEXT: .loh 1 L1, L2, L3
+# CHECK-ERRORS-NEXT:              ^
+.loh 1 L1, L2, L3
+
+# Too few argumets.
+# CHECK-ERRORS: error: unexpected token in '.loh' directive
+# CHECK-ERRORS-NEXT: .loh AdrpAdrp L1
+# CHECK-ERRORS-NEXT:                 ^
+.loh AdrpAdrp L1
+
+# Too few argumets with alternative syntax.
+# CHECK-ERRORS: error: unexpected token in '.loh' directive
+# CHECK-ERRORS-NEXT: .loh 1 L1
+# CHECK-ERRORS-NEXT:          ^
+.loh 1 L1