1 #include <isl_val_private.h>
2
3 #define xFN(TYPE,NAME) TYPE ## _ ## NAME
4 #define FN(TYPE,NAME) xFN(TYPE,NAME)
5
6 /* Compute the given non-zero power of "map" and return the result.
7 * If the exponent "exp" is negative, then the -exp th power of the inverse
8 * relation is computed.
9 */
FN(TYPE,fixed_power)10 __isl_give TYPE *FN(TYPE,fixed_power)(__isl_take TYPE *map, isl_int exp)
11 {
12 isl_ctx *ctx;
13 TYPE *res = NULL;
14 isl_int r;
15
16 if (!map)
17 return NULL;
18
19 ctx = FN(TYPE,get_ctx)(map);
20 if (isl_int_is_zero(exp))
21 isl_die(ctx, isl_error_invalid,
22 "expecting non-zero exponent", goto error);
23
24 if (isl_int_is_neg(exp)) {
25 isl_int_neg(exp, exp);
26 map = FN(TYPE,reverse)(map);
27 return FN(TYPE,fixed_power)(map, exp);
28 }
29
30 isl_int_init(r);
31 for (;;) {
32 isl_int_fdiv_r(r, exp, ctx->two);
33
34 if (!isl_int_is_zero(r)) {
35 if (!res)
36 res = FN(TYPE,copy)(map);
37 else {
38 res = FN(TYPE,apply_range)(res,
39 FN(TYPE,copy)(map));
40 res = FN(TYPE,coalesce)(res);
41 }
42 if (!res)
43 break;
44 }
45
46 isl_int_fdiv_q(exp, exp, ctx->two);
47 if (isl_int_is_zero(exp))
48 break;
49
50 map = FN(TYPE,apply_range)(map, FN(TYPE,copy)(map));
51 map = FN(TYPE,coalesce)(map);
52 }
53 isl_int_clear(r);
54
55 FN(TYPE,free)(map);
56 return res;
57 error:
58 FN(TYPE,free)(map);
59 return NULL;
60 }
61
62 /* Compute the given non-zero power of "map" and return the result.
63 * If the exponent "exp" is negative, then the -exp th power of the inverse
64 * relation is computed.
65 */
FN(TYPE,fixed_power_val)66 __isl_give TYPE *FN(TYPE,fixed_power_val)(__isl_take TYPE *map,
67 __isl_take isl_val *exp)
68 {
69 if (!map || !exp)
70 goto error;
71 if (!isl_val_is_int(exp))
72 isl_die(FN(TYPE,get_ctx)(map), isl_error_invalid,
73 "expecting integer exponent", goto error);
74 map = FN(TYPE,fixed_power)(map, exp->n);
75 isl_val_free(exp);
76 return map;
77 error:
78 FN(TYPE,free)(map);
79 isl_val_free(exp);
80 return NULL;
81 }
82