===================================================================
@@ -1291,9 +1291,20 @@ simplify_operand_subreg (int nop, enum m
&& ! LRA_SUBREG_P (operand))
|| CONSTANT_P (reg) || GET_CODE (reg) == PLUS || MEM_P (reg))
{
- /* The class will be defined later in curr_insn_transform. */
- enum reg_class rclass
- = (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
+ enum reg_class rclass;
+
+ if (REG_P (reg)
+ && curr_insn_set != NULL_RTX
+ && (REG_P (SET_SRC (curr_insn_set))
+ || GET_CODE (SET_SRC (curr_insn_set)) == SUBREG))
+ /* There is big probability that we will get the same class
+ for the new pseudo and we will get the same insn which
+ means infinite looping. So spill the new pseudo. */
+ rclass = NO_REGS;
+ else
+ /* The class will be defined later in curr_insn_transform. */
+ rclass
+ = (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
if (get_reload_reg (curr_static_id->operand[nop].type, reg_mode, reg,
rclass, "subreg reg", &new_reg))