isl_sample.c: extract out empty_sample
[isl.git] / isl_seq.c
blob7571b22e7b5af5494e7c73e84b5d9e31e5cd1228
1 #include "isl_seq.h"
3 void isl_seq_clr(isl_int *p, unsigned len)
5 int i;
6 for (i = 0; i < len; ++i)
7 isl_int_set_si(p[i], 0);
10 void isl_seq_neg(isl_int *dst, isl_int *src, unsigned len)
12 int i;
13 for (i = 0; i < len; ++i)
14 isl_int_neg(dst[i], src[i]);
17 void isl_seq_cpy(isl_int *dst, isl_int *src, unsigned len)
19 int i;
20 for (i = 0; i < len; ++i)
21 isl_int_set(dst[i], src[i]);
24 void isl_seq_submul(isl_int *dst, isl_int f, isl_int *src, unsigned len)
26 int i;
27 for (i = 0; i < len; ++i)
28 isl_int_submul(dst[i], f, src[i]);
31 void isl_seq_swp_or_cpy(isl_int *dst, isl_int *src, unsigned len)
33 int i;
34 for (i = 0; i < len; ++i)
35 isl_int_swap_or_set(dst[i], src[i]);
38 void isl_seq_scale(isl_int *dst, isl_int *src, isl_int m, unsigned len)
40 int i;
41 for (i = 0; i < len; ++i)
42 isl_int_mul(dst[i], src[i], m);
45 void isl_seq_scale_down(isl_int *dst, isl_int *src, isl_int m, unsigned len)
47 int i;
48 for (i = 0; i < len; ++i)
49 isl_int_divexact(dst[i], src[i], m);
52 void isl_seq_fdiv_q(isl_int *dst, isl_int *src, isl_int m, unsigned len)
54 int i;
55 for (i = 0; i < len; ++i)
56 isl_int_fdiv_q(dst[i], src[i], m);
59 void isl_seq_fdiv_r(isl_int *dst, isl_int *src, isl_int m, unsigned len)
61 int i;
62 for (i = 0; i < len; ++i)
63 isl_int_fdiv_r(dst[i], src[i], m);
66 void isl_seq_combine(isl_int *dst, isl_int m1, isl_int *src1,
67 isl_int m2, isl_int *src2, unsigned len)
69 int i;
70 isl_int tmp;
72 isl_int_init(tmp);
73 for (i = 0; i < len; ++i) {
74 isl_int_mul(tmp, m1, src1[i]);
75 isl_int_addmul(tmp, m2, src2[i]);
76 isl_int_set(dst[i], tmp);
78 isl_int_clear(tmp);
82 * Let d = dst[pos] and s = src[pos]
83 * dst is replaced by |s| dst - sgn(s)d src
85 void isl_seq_elim(isl_int *dst, isl_int *src, unsigned pos, unsigned len,
86 isl_int *m)
88 isl_int a;
89 isl_int b;
91 if (isl_int_is_zero(dst[pos]))
92 return;
94 isl_int_init(a);
95 isl_int_init(b);
97 isl_int_gcd(a, src[pos], dst[pos]);
98 isl_int_divexact(b, dst[pos], a);
99 if (isl_int_is_pos(src[pos]))
100 isl_int_neg(b, b);
101 isl_int_divexact(a, src[pos], a);
102 isl_int_abs(a, a);
103 isl_seq_combine(dst, a, dst, b, src, len);
105 if (m)
106 isl_int_mul(*m, *m, a);
108 isl_int_clear(a);
109 isl_int_clear(b);
112 int isl_seq_eq(isl_int *p1, isl_int *p2, unsigned len)
114 int i;
115 for (i = 0; i < len; ++i)
116 if (isl_int_ne(p1[i], p2[i]))
117 return 0;
118 return 1;
121 int isl_seq_cmp(isl_int *p1, isl_int *p2, unsigned len)
123 int i;
124 int cmp;
125 for (i = 0; i < len; ++i)
126 if ((cmp = isl_int_cmp(p1[i], p2[i])) != 0)
127 return cmp;
128 return 0;
131 int isl_seq_is_neg(isl_int *p1, isl_int *p2, unsigned len)
133 int i;
135 for (i = 0; i < len; ++i) {
136 if (isl_int_abs_ne(p1[i], p2[i]))
137 return 0;
138 if (isl_int_is_zero(p1[i]))
139 continue;
140 if (isl_int_eq(p1[i], p2[i]))
141 return 0;
143 return 1;
146 int isl_seq_first_non_zero(isl_int *p, unsigned len)
148 int i;
150 for (i = 0; i < len; ++i)
151 if (!isl_int_is_zero(p[i]))
152 return i;
153 return -1;
156 int isl_seq_abs_min_non_zero(isl_int *p, unsigned len)
158 int i, min = isl_seq_first_non_zero(p, len);
159 if (min < 0)
160 return -1;
161 for (i = min + 1; i < len; ++i) {
162 if (isl_int_is_zero(p[i]))
163 continue;
164 if (isl_int_abs_lt(p[i], p[min]))
165 min = i;
167 return min;
170 void isl_seq_gcd(isl_int *p, unsigned len, isl_int *gcd)
172 int i, min = isl_seq_abs_min_non_zero(p, len);
174 if (min < 0) {
175 isl_int_set_si(*gcd, 0);
176 return;
178 isl_int_abs(*gcd, p[min]);
179 for (i = 0; isl_int_cmp_si(*gcd, 1) > 0 && i < len; ++i) {
180 if (i == min)
181 continue;
182 if (isl_int_is_zero(p[i]))
183 continue;
184 isl_int_gcd(*gcd, *gcd, p[i]);
188 void isl_seq_normalize(isl_int *p, unsigned len)
190 isl_int gcd;
192 if (len == 0)
193 return;
194 isl_int_init(gcd);
195 isl_seq_gcd(p, len, &gcd);
196 if (!isl_int_is_zero(gcd))
197 isl_seq_scale_down(p, p, gcd, len);
198 isl_int_clear(gcd);
201 void isl_seq_lcm(isl_int *p, unsigned len, isl_int *lcm)
203 int i;
205 if (len == 0) {
206 isl_int_set_si(*lcm, 1);
207 return;
209 isl_int_set(*lcm, p[0]);
210 for (i = 1; i < len; ++i)
211 isl_int_lcm(*lcm, *lcm, p[i]);
214 void isl_seq_inner_product(isl_int *p1, isl_int *p2, unsigned len,
215 isl_int *prod)
217 int i;
218 if (len == 0) {
219 isl_int_set_si(*prod, 0);
220 return;
222 isl_int_mul(*prod, p1[0], p2[0]);
223 for (i = 1; i < len; ++i)
224 isl_int_addmul(*prod, p1[i], p2[i]);
227 uint32_t isl_seq_hash(isl_int *p, unsigned len, uint32_t hash)
229 int i;
230 for (i = 0; i < len; ++i) {
231 if (isl_int_is_zero(p[i]))
232 continue;
233 hash *= 16777619;
234 hash ^= (i & 0xFF);
235 hash = isl_int_hash(p[i], hash);
237 return hash;
240 uint32_t isl_seq_get_hash(isl_int *p, unsigned len)
242 uint32_t hash = isl_hash_init();
244 return isl_seq_hash(p, len, hash);
247 uint32_t isl_seq_get_hash_bits(isl_int *p, unsigned len, unsigned bits)
249 uint32_t hash;
251 hash = isl_seq_get_hash(p, len);
252 return isl_hash_bits(hash, bits);