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1 #include "Python.h"
2
3 #ifdef X87_DOUBLE_ROUNDING
4 /* On x86 platforms using an x87 FPU, this function is called from the
5 Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
6 number out of an 80-bit x87 FPU register and into a 64-bit memory location,
7 thus rounding from extended precision to double precision. */
8 double _Py_force_double(double x)
9 {
10 volatile double y;
11 y = x;
12 return y;
13 }
14 #endif
15
16 #ifdef HAVE_GCC_ASM_FOR_X87
17
18 /* inline assembly for getting and setting the 387 FPU control word on
19 gcc/x86 */
20
21 unsigned short _Py_get_387controlword(void) {
22 unsigned short cw;
23 __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
24 return cw;
25 }
26
27 void _Py_set_387controlword(unsigned short cw) {
28 __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
29 }
30
31 #endif
32
33
34 #ifndef HAVE_HYPOT
35 double hypot(double x, double y)
36 {
37 double yx;
38
39 x = fabs(x);
40 y = fabs(y);
41 if (x < y) {
42 double temp = x;
43 x = y;
44 y = temp;
45 }
46 if (x == 0.)
47 return 0.;
48 else {
49 yx = y/x;
50 return x*sqrt(1.+yx*yx);
51 }
52 }
53 #endif /* HAVE_HYPOT */
54
55 #ifndef HAVE_COPYSIGN
56 double
57 copysign(double x, double y)
58 {
59 /* use atan2 to distinguish -0. from 0. */
60 if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
61 return fabs(x);
62 } else {
63 return -fabs(x);
64 }
65 }
66 #endif /* HAVE_COPYSIGN */
67
68 #ifndef HAVE_ROUND
69 double
70 round(double x)
71 {
72 double absx, y;
73 absx = fabs(x);
74 y = floor(absx);
75 if (absx - y >= 0.5)
76 y += 1.0;
77 return copysign(y, x);
78 }
79 #endif /* HAVE_ROUND */