| #include "libm.h" |
| |
| #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 |
| long double cosl(long double x) { |
| return cos(x); |
| } |
| #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 |
| long double cosl(long double x) |
| { |
| union ldshape u = {x}; |
| unsigned n; |
| long double y[2], hi, lo; |
| |
| u.i.se &= 0x7fff; |
| if (u.i.se == 0x7fff) |
| return x - x; |
| x = u.f; |
| if (x < M_PI_4) { |
| if (u.i.se < 0x3fff - LDBL_MANT_DIG) |
| /* raise inexact if x!=0 */ |
| return 1.0 + x; |
| return __cosl(x, 0); |
| } |
| n = __rem_pio2l(x, y); |
| hi = y[0]; |
| lo = y[1]; |
| switch (n & 3) { |
| case 0: |
| return __cosl(hi, lo); |
| case 1: |
| return -__sinl(hi, lo, 1); |
| case 2: |
| return -__cosl(hi, lo); |
| case 3: |
| default: |
| return __sinl(hi, lo, 1); |
| } |
| } |
| #endif |
