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author | das <das@FreeBSD.org> | 2011-10-21 06:40:36 +0000 |
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committer | das <das@FreeBSD.org> | 2011-10-21 06:40:36 +0000 |
commit | 9373f7b9c4f30f6577adcbbba17be55d53f114b6 (patch) | |
tree | c48465604c7967f5162a2c5f32ab24721a37e96c /lib/libc/powerpc64/gen | |
parent | 35a6cd64927e8d5f815012b9b8ac9e5efed5aa9a (diff) | |
download | FreeBSD-src-9373f7b9c4f30f6577adcbbba17be55d53f114b6.zip FreeBSD-src-9373f7b9c4f30f6577adcbbba17be55d53f114b6.tar.gz |
Replace a proliferation of buggy MD implementations of modf() with a
working MI one. The MI one only needs to be overridden on machines
with non-IEEE754 arithmetic. (The last supported one was the VAX.)
It can also be overridden if someone comes up with a faster one that
actually passes the regression tests -- but this is harder than it sounds.
Diffstat (limited to 'lib/libc/powerpc64/gen')
-rw-r--r-- | lib/libc/powerpc64/gen/Makefile.inc | 2 | ||||
-rw-r--r-- | lib/libc/powerpc64/gen/modf.c | 107 |
2 files changed, 1 insertions, 108 deletions
diff --git a/lib/libc/powerpc64/gen/Makefile.inc b/lib/libc/powerpc64/gen/Makefile.inc index 4b381c3..3bfabda 100644 --- a/lib/libc/powerpc64/gen/Makefile.inc +++ b/lib/libc/powerpc64/gen/Makefile.inc @@ -2,7 +2,7 @@ SRCS += _ctx_start.S fabs.S flt_rounds.c fpgetmask.c fpgetround.c \ fpgetsticky.c fpsetmask.c fpsetround.c \ - infinity.c ldexp.c makecontext.c modf.c _setjmp.S \ + infinity.c ldexp.c makecontext.c _setjmp.S \ setjmp.S sigsetjmp.S signalcontext.c syncicache.c \ _set_tp.c diff --git a/lib/libc/powerpc64/gen/modf.c b/lib/libc/powerpc64/gen/modf.c deleted file mode 100644 index 612c506..0000000 --- a/lib/libc/powerpc64/gen/modf.c +++ /dev/null @@ -1,107 +0,0 @@ -/* - * Copyright (c) 1994, 1995 Carnegie-Mellon University. - * All rights reserved. - * - * Author: Chris G. Demetriou - * - * Permission to use, copy, modify and distribute this software and - * its documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND - * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to - * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 - * - * any improvements or extensions that they make and grant Carnegie the - * rights to redistribute these changes. - * - * $NetBSD: modf.c,v 1.1 1995/02/10 17:50:25 cgd Exp $ - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/types.h> -#include <machine/ieee.h> -#include <errno.h> -#include <math.h> - -/* - * double modf(double val, double *iptr) - * returns: f and i such that |f| < 1.0, (f + i) = val, and - * sign(f) == sign(i) == sign(val). - * - * Beware signedness when doing subtraction, and also operand size! - */ -double -modf(val, iptr) - double val, *iptr; -{ - union doub { - double v; - struct ieee_double s; - } u, v; - u_int64_t frac; - - /* - * If input is Inf or NaN, return it and leave i alone. - */ - u.v = val; - if (u.s.dbl_exp == DBL_EXP_INFNAN) - return (u.v); - - /* - * If input can't have a fractional part, return - * (appropriately signed) zero, and make i be the input. - */ - if ((int)u.s.dbl_exp - DBL_EXP_BIAS > DBL_FRACBITS - 1) { - *iptr = u.v; - v.v = 0.0; - v.s.dbl_sign = u.s.dbl_sign; - return (v.v); - } - - /* - * If |input| < 1.0, return it, and set i to the appropriately - * signed zero. - */ - if (u.s.dbl_exp < DBL_EXP_BIAS) { - v.v = 0.0; - v.s.dbl_sign = u.s.dbl_sign; - *iptr = v.v; - return (u.v); - } - - /* - * There can be a fractional part of the input. - * If you look at the math involved for a few seconds, it's - * plain to see that the integral part is the input, with the - * low (DBL_FRACBITS - (exponent - DBL_EXP_BIAS)) bits zeroed, - * the fractional part is the part with the rest of the - * bits zeroed. Just zeroing the high bits to get the - * fractional part would yield a fraction in need of - * normalization. Therefore, we take the easy way out, and - * just use subtraction to get the fractional part. - */ - v.v = u.v; - /* Zero the low bits of the fraction, the sleazy way. */ - frac = ((u_int64_t)v.s.dbl_frach << 32) + v.s.dbl_fracl; - frac >>= DBL_FRACBITS - (u.s.dbl_exp - DBL_EXP_BIAS); - frac <<= DBL_FRACBITS - (u.s.dbl_exp - DBL_EXP_BIAS); - v.s.dbl_fracl = frac & 0xffffffff; - v.s.dbl_frach = frac >> 32; - *iptr = v.v; - - u.v -= v.v; - u.s.dbl_sign = v.s.dbl_sign; - return (u.v); -} |