diff options
| author | Bdale Garbee <bdale@gag.com> | 2013-12-19 01:38:40 -0700 |
|---|---|---|
| committer | Bdale Garbee <bdale@gag.com> | 2013-12-19 01:38:40 -0700 |
| commit | 575bbaf976c5840fd0e308549c45a466fdec1352 (patch) | |
| tree | 11bfb498348bf7687bffc24699c4b1a998988ee4 /src/math/sf_cos.c | |
| parent | b825116df173b77e2cab217a7b76112c742f9279 (diff) | |
| parent | bc3610d8cecbfed40c62d4dcb93fc9a4d2a7c9e3 (diff) | |
Merge branch 'branch-1.3' into debian
Conflicts:
ChangeLog
altoslib/AltosRecordMM.java
altosui/Makefile.am
altosui/altos-windows.nsi.in
configure.ac
debian/changelog
debian/control
doc/Makefile
doc/altusmetrum.xsl
doc/release-notes-1.2.1.xsl
doc/release-notes-1.2.xsl
Diffstat (limited to 'src/math/sf_cos.c')
| -rw-r--r-- | src/math/sf_cos.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/math/sf_cos.c b/src/math/sf_cos.c new file mode 100644 index 00000000..4c0a9a53 --- /dev/null +++ b/src/math/sf_cos.c @@ -0,0 +1,68 @@ +/* sf_cos.c -- float version of s_cos.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const float one=1.0; +#else +static float one=1.0; +#endif + +#ifdef __STDC__ + float cosf(float x) +#else + float cosf(x) + float x; +#endif +{ + float y[2],z=0.0; + __int32_t n,ix; + + GET_FLOAT_WORD(ix,x); + + /* |x| ~< pi/4 */ + ix &= 0x7fffffff; + if(ix <= 0x3f490fd8) return __kernel_cosf(x,z); + + /* cos(Inf or NaN) is NaN */ + else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; + + /* argument reduction needed */ + else { + n = __ieee754_rem_pio2f(x,y); + switch(n&3) { + case 0: return __kernel_cosf(y[0],y[1]); + case 1: return -__kernel_sinf(y[0],y[1],1); + case 2: return -__kernel_cosf(y[0],y[1]); + default: + return __kernel_sinf(y[0],y[1],1); + } + } +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double cos(double x) +#else + double cos(x) + double x; +#endif +{ + return (double) cosf((float) x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |