4
0
mirror of git://sourceware.org/git/newlib-cygwin.git synced 2025-01-15 11:00:04 +08:00
Thomas Fitzsimmons 0953fe640f * libm/common/s_fdim.c: New file.
* libm/common/s_fma.c: Likewise.
	* libm/common/s_fmax.c: Likewise.
	* libm/common/s_fmin.c: Likewise.
	* libm/common/s_fpclassify.c: Likewise.
	* libm/common/s_lrint.c: Likewise.
	* libm/common/s_lround.c: Likewise.
	* libm/common/s_nearbyint.c: Likewise.
	* libm/common/s_remquo.c: Likewise.
	* libm/common/s_round.c: Likewise.
	* libm/common/s_scalbln.c: Likewise.
	* libm/common/s_signbit.c: Likewise.
	* libm/common/s_trunc.c: Likewise.
	* libm/common/sf_fdim.c: Likewise.
	* libm/common/sf_fma.c: Likewise.
	* libm/common/sf_fmax.c: Likewise.
	* libm/common/sf_fmin.c: Likewise.
	* libm/common/sf_lrint.c: Likewise.
	* libm/common/sf_lround.c: Likewise.
	* libm/common/sf_nearbyint.c: Likewise.
	* libm/common/sf_remquo.c: Likewise.
	* libm/common/sf_round.c: Likewise.
	* libm/common/sf_scalbln.c: Likewise.
	* libm/common/sf_trunc.c: Likewise.
	* libm/math/w_exp2.c: Likewise.
	* libm/math/w_tgamma.c: Likewise.
	* libm/math/wf_exp2.c: Likewise.
	* libm/math/wf_tgamma.c: Likewise.
	* libm/mathfp/s_exp2.c: Likewise.
	* libm/mathfp/s_tgamma.c: Likewise.
	* libm/mathfp/sf_exp2.c: Likewise.
	* libm/mathfp/sf_tgamma.c: Likewise.
	* libm/math/er_gamma.c: Fix return value.
	* libm/math/erf_gamma.c: Likewise.
	* libm/mathfp/er_gamma.c: Likewise.
	* libm/mathfp/erf_gamma.c: Likewise.
	* libc/include/math.h (!__STRICT_ANSI__): Include ISOC99-specific
	declarations and macros.
	Regenerated all Makefile.in, aclocal.m4 and configure files to
	use new libtool macros in top-level libtool.m4
2002-06-07 21:59:57 +00:00

84 lines
1.9 KiB
C

/*
* ====================================================
* 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"
#ifndef _DOUBLE_IS_32BITS
#ifdef __STDC__
double round(double x)
#else
double round(x)
double x;
#endif
{
/* Most significant word, least significant word. */
__int32_t msw, exponent_less_1023;
__uint32_t lsw;
EXTRACT_WORDS(msw, lsw, x);
/* Extract exponent field. */
exponent_less_1023 = ((msw & 0x7ff00000) >> 20) - 1023;
if (exponent_less_1023 < 20)
{
if (exponent_less_1023 < 0)
{
msw &= 0x80000000;
if (exponent_less_1023 == -1)
/* Result is +1.0 or -1.0. */
msw |= (1023 << 20);
lsw = 0;
}
else
{
__uint32_t exponent_mask = 0x000fffff >> exponent_less_1023;
if ((msw & exponent_mask) == 0 && lsw == 0)
/* x in an integral value. */
return x;
msw += 0x00080000 >> exponent_less_1023;
msw &= ~exponent_mask;
lsw = 0;
}
}
else if (exponent_less_1023 > 51)
{
if (exponent_less_1023 == 1024)
/* x is NaN or infinite. */
return x + x;
else
return x;
}
else
{
__uint32_t exponent_mask = 0xffffffff >> (exponent_less_1023 - 20);
__uint32_t tmp;
if ((lsw & exponent_mask) == 0)
/* x is an integral value. */
return x;
tmp = lsw + (1 << (51 - exponent_less_1023));
if (tmp < lsw)
msw += 1;
lsw = tmp;
lsw &= ~exponent_mask;
}
INSERT_WORDS(x, msw, lsw);
return x;
}
#endif /* _DOUBLE_IS_32BITS */