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0953fe640f
* 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
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "fdlibm.h"
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double round(double x)
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#else
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double round(x)
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double x;
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#endif
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{
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/* Most significant word, least significant word. */
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__int32_t msw, exponent_less_1023;
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__uint32_t lsw;
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EXTRACT_WORDS(msw, lsw, x);
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/* Extract exponent field. */
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exponent_less_1023 = ((msw & 0x7ff00000) >> 20) - 1023;
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if (exponent_less_1023 < 20)
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{
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if (exponent_less_1023 < 0)
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{
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msw &= 0x80000000;
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if (exponent_less_1023 == -1)
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/* Result is +1.0 or -1.0. */
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msw |= (1023 << 20);
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lsw = 0;
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}
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else
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{
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__uint32_t exponent_mask = 0x000fffff >> exponent_less_1023;
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if ((msw & exponent_mask) == 0 && lsw == 0)
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/* x in an integral value. */
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return x;
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msw += 0x00080000 >> exponent_less_1023;
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msw &= ~exponent_mask;
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lsw = 0;
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}
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}
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else if (exponent_less_1023 > 51)
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{
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if (exponent_less_1023 == 1024)
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/* x is NaN or infinite. */
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return x + x;
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else
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return x;
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}
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else
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{
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__uint32_t exponent_mask = 0xffffffff >> (exponent_less_1023 - 20);
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__uint32_t tmp;
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if ((lsw & exponent_mask) == 0)
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/* x is an integral value. */
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return x;
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tmp = lsw + (1 << (51 - exponent_less_1023));
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if (tmp < lsw)
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msw += 1;
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lsw = tmp;
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lsw &= ~exponent_mask;
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}
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INSERT_WORDS(x, msw, lsw);
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return x;
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}
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#endif /* _DOUBLE_IS_32BITS */
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