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Diffstat (limited to 'lib/libm/src/s_lrintf.c')
| -rw-r--r-- | lib/libm/src/s_lrintf.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/lib/libm/src/s_lrintf.c b/lib/libm/src/s_lrintf.c new file mode 100644 index 00000000000..d045e116517 --- /dev/null +++ b/lib/libm/src/s_lrintf.c @@ -0,0 +1,92 @@ +/* $OpenBSD: s_lrintf.c,v 1.1 2006/09/25 20:25:41 kettenis Exp $ */ +/* $NetBSD: lrintf.c,v 1.3 2004/10/13 15:18:32 drochner Exp $ */ + +/*- + * Copyright (c) 2004 + * Matthias Drochner. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/limits.h> +#include <math.h> +#include <ieeefp.h> +#include <machine/ieee.h> +#include "math_private.h" + +#ifndef LRINTNAME +#define LRINTNAME lrintf +#define RESTYPE long int +#define RESTYPE_MIN LONG_MIN +#define RESTYPE_MAX LONG_MAX +#endif + +#define RESTYPE_BITS (sizeof(RESTYPE) * 8) + +static const float +TWO23[2]={ + 8.3886080000e+06, /* 0x4b000000 */ + -8.3886080000e+06, /* 0xcb000000 */ +}; + +RESTYPE +LRINTNAME(float x) +{ + u_int32_t i0; + int e, s, shift; + RESTYPE res; + + GET_FLOAT_WORD(i0, x); + e = i0 >> SNG_FRACBITS; + s = e >> SNG_EXPBITS; + e = (e & 0xff) - SNG_EXP_BIAS; + + /* 1.0 x 2^-1 is the smallest number which can be rounded to 1 */ + if (e < -1) + return (0); + /* 1.0 x 2^31 (or 2^63) is already too large */ + if (e >= (int)RESTYPE_BITS - 1) + return (s ? RESTYPE_MIN : RESTYPE_MAX); /* ??? unspecified */ + + /* >= 2^23 is already an exact integer */ + if (e < SNG_FRACBITS) { + volatile float t = x; /* work around gcc problem */ + /* round, using current direction */ + t += TWO23[s]; + t -= TWO23[s]; + x = t; + } + + GET_FLOAT_WORD(i0, x); + e = ((i0 >> SNG_FRACBITS) & 0xff) - SNG_EXP_BIAS; + i0 &= 0x7fffff; + i0 |= (1 << SNG_FRACBITS); + + shift = e - SNG_FRACBITS; + if (shift >=0) + res = (shift < 32 ? (RESTYPE)i0 << shift : 0); + else + res = (shift > -32 ? i0 >> -shift : 0); + + return (s ? -res : res); +} |