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Updated math code from the uClibc 0.9.33 release

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This commit is contained in:
Sam Lantinga
2017-11-04 15:53:19 -07:00
parent 34502143d9
commit 6cf065753c
18 changed files with 945 additions and 1198 deletions
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52
src/libm/s_sin.c
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@@ -1,4 +1,3 @@
/* @(#)s_sin.c 5.1 93/09/24 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
@@ -10,11 +9,6 @@
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static const char rcsid[] =
"$NetBSD: s_sin.c,v 1.7 1995/05/10 20:48:15 jtc Exp $";
#endif
/* sin(x)
* Return sine function of x.
*
@@ -49,43 +43,31 @@ static const char rcsid[] =
#include "math_libm.h"
#include "math_private.h"
libm_hidden_proto(sin)
#ifdef __STDC__
double sin(double x)
#else
double sin(x)
double x;
#endif
double sin(double x)
{
double y[2], z = 0.0;
int32_t n, ix;
double y[2],z=0.0;
int32_t n, ix;
/* High word of x. */
GET_HIGH_WORD(ix, x);
GET_HIGH_WORD(ix,x);
/* |x| ~< pi/4 */
ix &= 0x7fffffff;
if (ix <= 0x3fe921fb)
return __kernel_sin(x, z, 0);
ix &= 0x7fffffff;
if(ix <= 0x3fe921fb) return __kernel_sin(x,z,0);
/* sin(Inf or NaN) is NaN */
else if (ix >= 0x7ff00000)
return x - x;
else if (ix>=0x7ff00000) return x-x;
/* argument reduction needed */
else {
n = __ieee754_rem_pio2(x, y);
switch (n & 3) {
case 0:
return __kernel_sin(y[0], y[1], 1);
case 1:
return __kernel_cos(y[0], y[1]);
case 2:
return -__kernel_sin(y[0], y[1], 1);
default:
return -__kernel_cos(y[0], y[1]);
}
}
else {
n = __ieee754_rem_pio2(x,y);
switch(n&3) {
case 0: return __kernel_sin(y[0],y[1],1);
case 1: return __kernel_cos(y[0],y[1]);
case 2: return -__kernel_sin(y[0],y[1],1);
default:
return -__kernel_cos(y[0],y[1]);
}
}
}
libm_hidden_def(sin)