@@ -11020,6 +11020,8 @@ aarch64_if_then_else_costs (rtx op0, rtx op1, rtx op2, int *cost, bool speed)
rtx inner;
rtx comparator;
enum rtx_code cmpcode;
+ const struct cpu_cost_table *extra_cost
+ = aarch64_tune_params.insn_extra_cost;
if (COMPARISON_P (op0))
{
@@ -11054,8 +11056,17 @@ aarch64_if_then_else_costs (rtx op0, rtx op1, rtx op2, int *cost, bool speed)
/* CBZ/CBNZ. */
*cost += rtx_cost (inner, VOIDmode, cmpcode, 0, speed);
- return true;
- }
+ return true;
+ }
+ if (register_operand (inner, VOIDmode)
+ && aarch64_imm24 (comparator, VOIDmode))
+ {
+ /* SUB and SUBS. */
+ *cost += COSTS_N_INSNS (2);
+ if (speed)
+ *cost += extra_cost->alu.arith * 2;
+ return true;
+ }
}
else if (cmpcode == LT || cmpcode == GE)
{