1 /* libgcc routines for R8C/M16C/M32C
2 Copyright (C) 2005-2020 Free Software Foundation, Inc.
3 Contributed by Red Hat.
4
5 This file is part of GCC.
6
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.
11
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.
16
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
25
26 typedef int sint32_type __attribute__ ((mode (SI)));
27 typedef unsigned int uint32_type __attribute__ ((mode (SI)));
28 typedef int word_type __attribute__ ((mode (__word__)));
29
30 uint32_type udivmodsi4 (uint32_type, uint32_type, word_type);
31 sint32_type __divsi3 (sint32_type, sint32_type);
32 sint32_type __modsi3 (sint32_type, sint32_type);
33
34 uint32_type
udivmodsi4(uint32_type num,uint32_type den,word_type modwanted)35 udivmodsi4 (uint32_type num, uint32_type den, word_type modwanted)
36 {
37 uint32_type bit = 1;
38 uint32_type res = 0;
39
40 while (den < num && bit && !(den & (1L << 31)))
41 {
42 den <<= 1;
43 bit <<= 1;
44 }
45 while (bit)
46 {
47 if (num >= den)
48 {
49 num -= den;
50 res |= bit;
51 }
52 bit >>= 1;
53 den >>= 1;
54 }
55 if (modwanted)
56 return num;
57 return res;
58 }
59
60 sint32_type
__divsi3(sint32_type a,sint32_type b)61 __divsi3 (sint32_type a, sint32_type b)
62 {
63 word_type neg = 0;
64 sint32_type res;
65
66 if (a < 0)
67 {
68 a = -a;
69 neg = !neg;
70 }
71
72 if (b < 0)
73 {
74 b = -b;
75 neg = !neg;
76 }
77
78 res = udivmodsi4 (a, b, 0);
79
80 if (neg)
81 res = -res;
82
83 return res;
84 }
85
86 sint32_type
__modsi3(sint32_type a,sint32_type b)87 __modsi3 (sint32_type a, sint32_type b)
88 {
89 word_type neg = 0;
90 sint32_type res;
91
92 if (a < 0)
93 {
94 a = -a;
95 neg = 1;
96 }
97
98 if (b < 0)
99 b = -b;
100
101 res = udivmodsi4 (a, b, 1);
102
103 if (neg)
104 res = -res;
105
106 return res;
107 }
108
109 /* See the comment by the definition of LIBGCC2_UNITS_PER_WORD in
110 m32c.h for why we are creating extra versions of some of the
111 functions defined in libgcc2.c. */
112
113 #define LIBGCC2_UNITS_PER_WORD 2
114
115 #define L_clzsi2
116 #define L_ctzsi2
117 #define L_ffssi2
118 #define L_paritysi2
119 #define L_popcountsi2
120
121 #include "libgcc2.c"
122
123 uint32_type
__udivsi3(uint32_type a,uint32_type b)124 __udivsi3 (uint32_type a, uint32_type b)
125 {
126 return udivmodsi4 (a, b, 0);
127 }
128
129 uint32_type
__umoddi3(uint32_type a,uint32_type b)130 __umoddi3 (uint32_type a, uint32_type b)
131 {
132 return udivmodsi4 (a, b, 1);
133 }
134
135 /* Returns the number of leading redundant sign bits in X.
136 I.e. the number of bits following the most significant bit which are
137 identical to it. There are no special cases for 0 or other values. */
138
139 int
__clrsbhi2(word_type x)140 __clrsbhi2 (word_type x)
141 {
142 if (x < 0)
143 x = ~x;
144 if (x == 0)
145 return 15;
146 return __builtin_clz (x) - 1;
147 }
148