[arm64] Use exclusive instructions in exchange

test/cctest/test-disasm-arm64.cc

Index: test/cctest/test-disasm-arm64.cc
diff --git a/test/cctest/test-disasm-arm64.cc b/test/cctest/test-disasm-arm64.cc
index d03350c5f522115aca0c44bd989bf352c58f2fce..4e2e6c33239b8862652fd9f68a29413fc7055c10 100644
--- a/test/cctest/test-disasm-arm64.cc
+++ b/test/cctest/test-disasm-arm64.cc
@@ -1260,6 +1260,21 @@ TEST_(load_store_pair) {
   CLEANUP();
 }
 
+TEST_(load_store_exclusive) {
+  SET_UP_MASM();
+
+  COMPARE(ldxr(w6, x7), "ldxr w6, [x7]");
+  COMPARE(ldxrb(w8, x9), "ldxrb w8, [x9]");
+  COMPARE(ldxrh(w10, x11), "ldxrh w10, [x11]");
+  COMPARE(stxr(w18, w19, x20), "stxr w18, w19, [x20]");
+  COMPARE(stxrb(w21, w22, x23), "stxrb w21, w22, [x23]");
+  COMPARE(stxrh(w24, w25, x26), "stxrh w24, w25, [x26]");
+  COMPARE(ldxr(wzr, csp), "ldxr wzr, [csp]");
+  COMPARE(stxr(wzr, wzr, csp), "stxr wzr, wzr, [csp]");
+
+  CLEANUP();
+}
+
 TEST_(load_store_acquire_release) {
   SET_UP_MASM();
 
@@ -1275,6 +1290,10 @@ TEST_(load_store_acquire_release) {
   COMPARE(stlxr(w18, w19, x20), "stlxr w18, w19, [x20]");
   COMPARE(stlxrb(w21, w22, x23), "stlxrb w21, w22, [x23]");
   COMPARE(stlxrh(w24, w25, x26), "stlxrh w24, w25, [x26]");
+  COMPARE(ldar(wzr, csp), "ldar wzr, [csp]");
+  COMPARE(stlr(wzr, csp), "stlr wzr, [csp]");
+  COMPARE(ldaxr(wzr, csp), "ldaxr wzr, [csp]");
+  COMPARE(stlxr(wzr, wzr, csp), "stlxr wzr, wzr, [csp]");
 
   CLEANUP();
 }