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19ce9cf1 | 1 | ;;- Constraint definitions for the pdp11 for GNU C compiler |
99dee823 | 2 | ;; Copyright (C) 2010-2021 Free Software Foundation, Inc. |
19ce9cf1 PK |
3 | ;; Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at). |
4 | ||
5 | ;; This file is part of GCC. | |
6 | ||
7 | ;; GCC is free software; you can redistribute it and/or modify | |
8 | ;; it under the terms of the GNU General Public License as published by | |
9 | ;; the Free Software Foundation; either version 3, or (at your option) | |
10 | ;; any later version. | |
11 | ||
12 | ;; GCC is distributed in the hope that it will be useful, | |
13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;; GNU General Public License for more details. | |
16 | ||
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/>. | |
20 | ||
b4324a14 PK |
21 | (define_register_constraint "a" "LOAD_FPU_REGS" |
22 | "FPU register that can be directly loaded from memory") | |
23 | ||
19ce9cf1 PK |
24 | (define_register_constraint "f" "FPU_REGS" |
25 | "Any FPU register") | |
26 | ||
b4324a14 PK |
27 | (define_register_constraint "h" "NO_LOAD_FPU_REGS" |
28 | "FPU register that cannot be directly loaded from memory") | |
19ce9cf1 PK |
29 | |
30 | (define_register_constraint "d" "MUL_REGS" | |
31 | "General register that can be used for 16-bit multiply (odd numbered)") | |
32 | ||
33 | (define_constraint "I" | |
34 | "Integer constant that fits in 16 bits unsigned" | |
35 | (and (match_code "const_int") | |
36 | (match_test "(ival & 0xffff0000) == 0"))) | |
37 | ||
38 | (define_constraint "J" | |
39 | "Integer constant whose low 16 bits are zero" | |
40 | (and (match_code "const_int") | |
41 | (match_test "(ival & 0xffff) == 0"))) | |
42 | ||
43 | (define_constraint "K" | |
44 | "Integer constant whose lower and upper 16 bit half are both non-zero" | |
45 | (and (match_code "const_int") | |
46 | (match_test "(ival & 0xffff) != 0 && (ival & 0xffff0000) != 0"))) | |
47 | ||
48 | (define_constraint "L" | |
49 | "Integer constant 1" | |
50 | (and (match_code "const_int") | |
51 | (match_test "ival == 1"))) | |
52 | ||
53 | (define_constraint "M" | |
54 | "Integer constant -1" | |
55 | (and (match_code "const_int") | |
56 | (match_test "ival == -1"))) | |
57 | ||
58 | (define_constraint "N" | |
59 | "Integer constant 0" | |
60 | (and (match_code "const_int") | |
61 | (match_test "ival == 0"))) | |
62 | ||
63 | (define_constraint "O" | |
64 | "Integer constant for which several individual shifts are better than one big one" | |
65 | (and (match_code "const_int") | |
b4324a14 | 66 | (match_test "pdp11_small_shift (ival)"))) |
19ce9cf1 PK |
67 | |
68 | (define_constraint "G" | |
69 | "Defines a real zero constant." | |
70 | (and (match_code "const_double") | |
71 | (match_test "op == CONST0_RTX (GET_MODE (op))"))) | |
72 | ||
0a7eb8df | 73 | (define_memory_constraint "Q" |
19ce9cf1 PK |
74 | "Memory reference that requires an additional word after the opcode" |
75 | (and (match_code "mem") | |
76 | (match_test "memory_address_p (GET_MODE (op), XEXP (op, 0)) | |
77 | && !simple_memory_operand (op, GET_MODE (op))"))) | |
78 | ||
0a7eb8df | 79 | (define_memory_constraint "R" |
19ce9cf1 PK |
80 | "Memory reference that is encoded within the opcode" |
81 | (and (match_code "mem") | |
82 | (match_test "memory_address_p (GET_MODE (op), XEXP (op, 0)) | |
83 | && simple_memory_operand (op, GET_MODE (op))"))) | |
84 | ||
0a7eb8df | 85 | (define_memory_constraint "D" |
b4324a14 PK |
86 | "Memory reference that is encoded within the opcode, and not push or pop" |
87 | (and (match_code "mem") | |
88 | (match_test "memory_address_p (GET_MODE (op), XEXP (op, 0)) | |
89 | && no_side_effect_operand (op, GET_MODE (op))"))) | |
90 | ||
442fcea7 PK |
91 | ;; What follows is a set of constraints used to prevent the generation |
92 | ;; of insns that have a register as source, and an auto-increment or | |
93 | ;; auto-decrement memory reference as the destination where the register | |
94 | ;; is the same as the source. On the PDP11, such instructions are not | |
95 | ;; implemented consistently across the models and often do something | |
96 | ;; different from what the RTL intends. | |
97 | (define_register_constraint "Z0" "NOTR0_REG" "Register other than 0") | |
98 | (define_register_constraint "Z1" "NOTR1_REG" "Register other than 1") | |
99 | (define_register_constraint "Z2" "NOTR2_REG" "Register other than 2") | |
100 | (define_register_constraint "Z3" "NOTR3_REG" "Register other than 3") | |
101 | (define_register_constraint "Z4" "NOTR4_REG" "Register other than 4") | |
102 | (define_register_constraint "Z5" "NOTR5_REG" "Register other than 5") | |
103 | (define_register_constraint "Z6" "NOTSP_REG" | |
104 | "Register other than stack pointer (register 6)") | |
105 | (define_memory_constraint "Za" "R0 push/pop" | |
106 | (match_test "pushpop_regeq (op, 0)")) | |
107 | (define_memory_constraint "Zb" "R1 push/pop" | |
108 | (match_test "pushpop_regeq (op, 1)")) | |
109 | (define_memory_constraint "Zc" "R2 push/pop" | |
110 | (match_test "pushpop_regeq (op, 2)")) | |
111 | (define_memory_constraint "Zd" "R3 push/pop" | |
112 | (match_test "pushpop_regeq (op, 3)")) | |
113 | (define_memory_constraint "Ze" "R4 push/pop" | |
114 | (match_test "pushpop_regeq (op, 4)")) | |
115 | (define_memory_constraint "Zf" "R5 push/pop" | |
116 | (match_test "pushpop_regeq (op, 5)")) | |
117 | (define_memory_constraint "Zg" "SP push/pop" | |
118 | (match_test "pushpop_regeq (op, 6)")) | |
119 |