- fallback_casx(r0, r1, r2, r3, i0);
+ jit_int32_t iscasi, r1_reg;
+ if ((iscasi = (r1 == _NOREG))) {
+ r1_reg = jit_get_reg(jit_class_gpr);
+ r1 = rn(r1_reg);
+ movi(r1, i0);
+ }
+ /* Do not clobber r2 */
+ movr(r0, r3);
+ /* The CASXA instruction compares the value in register r[rs2] with
+ * the doubleword in memory pointed to by the doubleword address in
+ * r[rs1]. If the values are equal, the value in r[rd] is swapped
+ * with the doubleword pointed to by the doubleword address in r[rs1].
+ * If the values are not equal, the contents of the doubleword pointed
+ * to by r[rs1] replaces the value in r[rd], but the memory location
+ * remains unchanged.
+ */
+# if __WORDSIZE == 32
+ CASA(r1, r2, r0);
+# else
+ CASXA(r1, r2, r0);
+# endif
+ eqr(r0, r0, r2);
+ if (iscasi)
+ jit_unget_reg(r1_reg);