mirror of
https://github.com/fluencelabs/musl
synced 2025-05-29 23:51:34 +00:00
bfda379358
* use unsigned arithmetics * use unsigned to store arg reduction quotient (so n&3 is understood) * remove z=0.0 variables, use literal 0 * raise underflow and inexact exceptions properly when x is small * fix spurious underflow in tanl
65 lines
1.1 KiB
C
65 lines
1.1 KiB
C
#define _GNU_SOURCE
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#include "libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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void sincosl(long double x, long double *sin, long double *cos)
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{
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sincos(x, (double *)sin, (double *)cos);
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}
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#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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void sincosl(long double x, long double *sin, long double *cos)
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{
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union IEEEl2bits u;
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unsigned n;
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long double y[2], s, c;
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u.e = x;
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u.bits.sign = 0;
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/* x = nan or inf */
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if (u.bits.exp == 0x7fff) {
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*sin = *cos = x - x;
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return;
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}
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/* |x| < (double)pi/4 */
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if (u.e < M_PI_4) {
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/* |x| < 0x1p-64 */
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if (u.bits.exp < 0x3fff - 64) {
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/* raise underflow if subnormal */
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if (u.bits.exp == 0) FORCE_EVAL(x*0x1p-120f);
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*sin = x;
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/* raise inexact if x!=0 */
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*cos = 1.0 + x;
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return;
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}
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*sin = __sinl(x, 0, 0);
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*cos = __cosl(x, 0);
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return;
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}
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n = __rem_pio2l(x, y);
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s = __sinl(y[0], y[1], 1);
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c = __cosl(y[0], y[1]);
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switch (n & 3) {
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case 0:
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*sin = s;
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*cos = c;
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break;
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case 1:
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*sin = c;
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*cos = -s;
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break;
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case 2:
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*sin = -s;
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*cos = -c;
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break;
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case 3:
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default:
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*sin = -c;
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*cos = s;
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break;
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}
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}
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#endif
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