2021-09-23 Kito Cheng <kito.cheng@sifive.com>
gcc/ChangeLog:
* config/riscv/riscv.c (riscv_rtx_costs): Handle cost model
for zbs extension.
---
gcc/config/riscv/riscv.c | 47 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
@@ -1851,6 +1851,24 @@ riscv_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UN
*total = COSTS_N_INSNS (1);
return true;
}
+ /* bclri pattern for zbs. */
+ if (TARGET_ZBS
+ && not_single_bit_mask_operand (XEXP (x, 1), VOIDmode))
+ {
+ *total = COSTS_N_INSNS (1);
+ return true;
+ }
+ /* bclr pattern for zbs. */
+ if (TARGET_ZBS
+ && REG_P (XEXP (x, 1))
+ && GET_CODE (XEXP (x, 0)) == ROTATE
+ && CONST_INT_P (XEXP ((XEXP (x, 0)), 0))
+ && INTVAL (XEXP ((XEXP (x, 0)), 0)) == -2)
+ {
+ *total = COSTS_N_INSNS (1);
+ return true;
+ }
+
gcc_fallthrough ();
case IOR:
case XOR:
@@ -1861,6 +1879,18 @@ riscv_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UN
*total = riscv_binary_cost (x, 1, 2);
return true;
}
+
+ /* bset[i] and binv[i] pattern for zbs. */
+ if ((GET_CODE (x) == IOR || GET_CODE (x) == XOR)
+ && TARGET_ZBS
+ && ((GET_CODE (XEXP (x, 0)) == ASHIFT
+ && CONST_INT_P (XEXP (XEXP (x, 0), 0)))
+ || single_bit_mask_operand (XEXP (x, 1), VOIDmode)))
+ {
+ *total = COSTS_N_INSNS (1);
+ return true;
+ }
+
/* Double-word operations use two single-word operations. */
*total = riscv_binary_cost (x, 1, 2);
return false;
@@ -1876,9 +1906,26 @@ riscv_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UN
*total = COSTS_N_INSNS (SINGLE_SHIFT_COST);
return true;
}
+ /* bext pattern for zbs. */
+ if (TARGET_ZBS && outer_code == SET
+ && GET_CODE (XEXP (x, 1)) == CONST_INT
+ && INTVAL (XEXP (x, 1)) == 1)
+ {
+ *total = COSTS_N_INSNS (SINGLE_SHIFT_COST);
+ return true;
+ }
return false;
case ASHIFT:
+ /* bset pattern for zbs. */
+ if (TARGET_ZBS
+ && CONST_INT_P (XEXP (x, 0))
+ && INTVAL (XEXP (x, 0)) == 1)
+ {
+ *total = COSTS_N_INSNS (1);
+ return true;
+ }
+ gcc_fallthrough ();
case ASHIFTRT:
case LSHIFTRT:
*total = riscv_binary_cost (x, SINGLE_SHIFT_COST,