1 ;; define_peephole2 optimization patterns of Andes NDS32 cpu for GNU compiler
2 ;; Copyright (C) 2012-2024 Free Software Foundation, Inc.
3 ;; Contributed by Andes Technology Corporation.
5 ;; This file is part of GCC.
7 ;; GCC is free software; you can redistribute it and/or modify it
8 ;; under the terms of the GNU General Public License as published
9 ;; by the Free Software Foundation; either version 3, or (at your
10 ;; option) any later version.
12 ;; GCC is distributed in the hope that it will be useful, but WITHOUT
13 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 ;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 ;; License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GCC; see the file COPYING3. If not see
19 ;; <http://www.gnu.org/licenses/>.
22 ;; Use define_peephole2 to handle possible target-specific optimization.
24 ;; ------------------------------------------------------------------------
25 ;; Try to utilize 16-bit instruction by swap operand if possible.
26 ;; ------------------------------------------------------------------------
28 ;; Try to make add as add45.
30 [(set (match_operand:QIHISI 0 "register_operand" "")
31 (plus:QIHISI (match_operand:QIHISI 1 "register_operand" "")
32 (match_operand:QIHISI 2 "register_operand" "")))]
35 && REGNO (operands[0]) == REGNO (operands[2])
36 && REGNO (operands[0]) != REGNO (operands[1])
37 && TEST_HARD_REG_BIT (reg_class_contents[MIDDLE_REGS], REGNO (operands[0]))"
38 [(set (match_dup 0) (plus:QIHISI (match_dup 2) (match_dup 1)))])
40 ;; Try to make xor/ior/and/mult as xor33/ior33/and33/mult33.
42 [(set (match_operand:SI 0 "register_operand" "")
43 (match_operator:SI 1 "nds32_have_33_inst_operator"
44 [(match_operand:SI 2 "register_operand" "")
45 (match_operand:SI 3 "register_operand" "")]))]
48 && REGNO (operands[0]) == REGNO (operands[3])
49 && REGNO (operands[0]) != REGNO (operands[2])
50 && TEST_HARD_REG_BIT (reg_class_contents[LOW_REGS], REGNO (operands[0]))
51 && TEST_HARD_REG_BIT (reg_class_contents[LOW_REGS], REGNO (operands[2]))"
52 [(set (match_dup 0) (match_op_dup 1 [(match_dup 3) (match_dup 2)]))])
55 [(set (match_operand:SI 0 "register_operand" "")
56 (match_operand:SI 1 "register_operand" ""))
57 (set (match_operand:SI 2 "register_operand" "")
58 (match_operand:SI 3 "register_operand" ""))]
61 && NDS32_IS_GPR_REGNUM (REGNO (operands[0]))
62 && NDS32_IS_GPR_REGNUM (REGNO (operands[1]))
63 && ((REGNO (operands[0]) & 0x1) == 0)
64 && ((REGNO (operands[1]) & 0x1) == 0)
65 && (REGNO (operands[0]) + 1) == REGNO (operands[2])
66 && (REGNO (operands[1]) + 1) == REGNO (operands[3])"
68 [(set_attr "type" "alu")
69 (set_attr "length" "2")])
71 ;; Merge two fcpyss to fcpysd.
73 [(set (match_operand:SF 0 "float_even_register_operand" "")
74 (match_operand:SF 1 "float_even_register_operand" ""))
75 (set (match_operand:SF 2 "float_odd_register_operand" "")
76 (match_operand:SF 3 "float_odd_register_operand" ""))]
77 "(TARGET_FPU_SINGLE || TARGET_FPU_DOUBLE)
78 && REGNO (operands[0]) == REGNO (operands[2]) - 1
79 && REGNO (operands[1]) == REGNO (operands[3]) - 1"
80 [(set (match_dup 4) (match_dup 5))]
82 operands[4] = gen_rtx_REG (DFmode, REGNO (operands[0]));
83 operands[5] = gen_rtx_REG (DFmode, REGNO (operands[1]));
87 [(set (match_operand:SF 0 "float_odd_register_operand" "")
88 (match_operand:SF 1 "float_odd_register_operand" ""))
89 (set (match_operand:SF 2 "float_even_register_operand" "")
90 (match_operand:SF 3 "float_even_register_operand" ""))]
91 "(TARGET_FPU_SINGLE || TARGET_FPU_DOUBLE)
92 && REGNO (operands[2]) == REGNO (operands[0]) - 1
93 && REGNO (operands[3]) == REGNO (operands[1]) - 1"
94 [(set (match_dup 4) (match_dup 5))]
96 operands[4] = gen_rtx_REG (DFmode, REGNO (operands[2]));
97 operands[5] = gen_rtx_REG (DFmode, REGNO (operands[3]));
100 ;; ------------------------------------------------------------------------
101 ;; GCC will prefer [u]divmodsi3 rather than [u]divsi3 even remainder is
102 ;; unused, so we use split to drop mod operation for lower register pressure.
105 [(set (match_operand:SI 0 "register_operand")
106 (div:SI (match_operand:SI 1 "register_operand")
107 (match_operand:SI 2 "register_operand")))
108 (set (match_operand:SI 3 "register_operand")
109 (mod:SI (match_dup 1) (match_dup 2)))]
110 "find_regno_note (insn, REG_UNUSED, REGNO (operands[3])) != NULL
111 && can_create_pseudo_p ()"
113 (div:SI (match_dup 1)
117 [(set (match_operand:SI 0 "register_operand")
118 (udiv:SI (match_operand:SI 1 "register_operand")
119 (match_operand:SI 2 "register_operand")))
120 (set (match_operand:SI 3 "register_operand")
121 (umod:SI (match_dup 1) (match_dup 2)))]
122 "find_regno_note (insn, REG_UNUSED, REGNO (operands[3])) != NULL
123 && can_create_pseudo_p ()"
125 (udiv:SI (match_dup 1)
129 [(set (match_operand:DI 0 "register_operand")
130 (mult:DI (sign_extend:DI (match_operand:SI 1 "register_operand"))
131 (sign_extend:DI (match_operand:SI 2 "register_operand"))))]
133 && peep2_regno_dead_p (1, WORDS_BIG_ENDIAN ? REGNO (operands[0]) + 1 : REGNO (operands[0]))"
136 rtx highpart = nds32_di_high_part_subreg (operands[0]);
137 emit_insn (gen_smulsi3_highpart (highpart, operands[1], operands[2]));
142 [(set (match_operand:DI 0 "nds32_general_register_operand" "")
143 (match_operand:DI 1 "nds32_general_register_operand" ""))]
144 "find_regno_note (insn, REG_UNUSED, REGNO (operands[0])) != NULL
145 || find_regno_note (insn, REG_UNUSED, REGNO (operands[0]) + 1) != NULL"
146 [(set (match_dup 0) (match_dup 1))]
148 rtx dead_note = find_regno_note (curr_insn, REG_UNUSED, REGNO (operands[0]));
149 HOST_WIDE_INT offset;
150 if (dead_note == NULL_RTX)
154 operands[0] = simplify_gen_subreg (
157 operands[1] = simplify_gen_subreg (