glibc/sysdeps/libm-ieee754/e_hypot.c
Ulrich Drepper 6bc31da01b update from main archive 970101
Wed Jan  1 15:15:00 1997  Ulrich Drepper  <drepper@cygnus.com>

	* libio/Makefile (routines): Add fcloseall.
	* libio/fcloseall.c: New file.
	* libio/stdio.h [__USE_GNU]: Add prototype for fcloseall.
	* libio/iofclose.c: Don't close all streams when argument is NULL.

	* stdio/Makefile (routines): Add fcloseall.
	* stdio/fcloseall.c: New file.
	* stdio/stdio.h [__USE_GNU]: Add prototype for fcloseall.
	* stdio/fclose.c: Don't close all streams when argument is NULL.

	* manual/stdio.texi: Document fcloseall.

	* sysdeps/generic/abort.c: Call __fcloseall instead of fclose with
	NULL argument.

	* socket/sys/un.h (SUN_LEN): Add cast.

	* sunrpc/auth_unix.c (authunix_create): Change parameter types
	of uid, gid, and aup_gids to uid_t and gid_t respectively.
	(authunix_create_default): Likewise.
	(authunix_refresh): Correct cast for aup_gids assignment.
	* sunrpc/rpc/auth.h (authunix_create): Correct types in declaration.
	* sunrpc/rpc/auth_unix.h (struct authunix_parms): Correct field
	types to uid_t and gid_t respectively.
	(struct short_hand_verf): Likewise.
	Reported by Andreas Schwab.

	* sysdeps/ieee754/Makefile: New file.  Make sure ieee754.h gets
	installed.
	* sysdeps/ieee754/ieee754.h: Protect against multiple inclusion and
	use in C++ programs.

	* sysdeps/libm-i387/e_pow.S: New file.  Optimized ix87 assembler
	version of pow() function.
	* sysdeps/libm-i387/e_powf.S: New file.  Float version.
	* sysdeps/libm-i387/e_powl.S: New file.  Long double version.

	* sysdeps/libm-i387/s_expm1.S: New file.  Optimized ix87 assembler
	version of expm1() function.
	* sysdeps/libm-i387/s_expm1f.S: New file.  Float version.
	* sysdeps/libm-i387/s_expm1l.S: New file.  Long double version.

	* sysdeps/libm-i387/e_exp.S: Optimize handling of +-Inf.
	Better handling of computation stack from current NetBSD sources.
	* sysdeps/libm-i387/e_expf.S: Likewise.
	* sysdeps/libm-i387/e_expl.S: Likewise.

	* sysdeps/libm-i387/e_log.S: Use fstp instead of fincstp.
	* sysdeps/libm-i387/e_logf.S: Likewise.
	* sysdeps/libm-i387/e_logl.S: Likewise.
	* sysdeps/libm-i387/e_log10.S: Likewise.
	* sysdeps/libm-i387/e_log10f.S: Likewise.
	* sysdeps/libm-i387/e_log10l.S: Likewise.
	* sysdeps/libm-i387/s_asinh.S: Likewise.
	* sysdeps/libm-i387/s_asinhf.S: Likewise.
	* sysdeps/libm-i387/s_asinhl.S: Likewise.
	* sysdeps/libm-i387/s_significandl.S: Likewise.

	* sysdeps/libm-i387/s_ceil.S: Don't create stack frame.  Modify
	stack pointer directly.  Use 32 bit instead of 16 bit operations.
	* sysdeps/libm-i387/s_ceilf.S: Likewise.
	* sysdeps/libm-i387/s_ceill.S: Likewise.
	* sysdeps/libm-i387/s_floor.S: Likewise.
	* sysdeps/libm-i387/s_floorf.S: Likewise.
	* sysdeps/libm-i387/s_floorl.S: Likewise.

	* sysdeps/libm-ieee754/e_coshf.c (huge): Don't declare volatile.
	* sysdeps/libm-ieee754/e_expf.c: Likewise.
	* sysdeps/libm-ieee754/e_powf.c: Likewise.
	From current NetBSD sources.

	* sysdeps/libm-ieee754/e_hypot.c (__ieee754_hypot): Don't initialize
	`a' and `b' in definition.
	* sysdeps/libm-ieee754/e_hypotf.c: Likewise.

	* sysdeps/libm-ieee754/e_hypotl.c: New file.  Long double
	implementation.
	* sysdeps/libm-ieee754/e_sinhl.c: New file.  Long double
	implementation.
	* sysdeps/stub/e_hypotl.c: Removed.  We have a real version now.
	* sysdeps/stub/e_sinhl.c: Removed.

	* sysdeps/posix/sigpause.c (__sigpause): Use sigdelset instead of
	sigaddset.  Reported by Andreas Schwab.
	(__default_sigpause): New function.  Call __sigpause as BSD version.
	Make this the default function by providing alias sigpause.
	* sysdeps/stub/sigpause.c (__default_sigpause): New funciton.
	Simply fail.  Provide alias sigpause.

Wed Jan  1 12:34:54 1997  Ulrich Drepper  <drepper@cygnus.com>

	* po/es.po: Update for glibc-1.98.
	* po/fr.po: Likewise.
	* po/sv.po: New file.  Swedish translation.

Wed Jan  1 12:18:07 1997   MacGyver  <macgyver@tos.net>

	* values.h: Fix typos: use SHRT_MAX but SHORT_MAX and SHRT_MIN but
	SHORT_MIN.

Tue Dec 24 23:10:21 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile: Replace `stubs.h' by `gnu/stubs.h'.
	* features.h: Include <gnu/stubs.h> instead of <stubs.h>.

Tue Dec 24 22:16:55 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile (subdirs): Move `elf' last so that librtld.so isn't
	relinked in the `make others' pass if an add-on adds something to
	libc.

Mon Dec 23 21:23:16 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/abort-instr.h: New File.

Mon Dec 23 21:16:38 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/Makefile ($(subdir)=elf): Define CFLAGS-rtld.c
	to prevent warning.

Mon Dec 23 21:14:22 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* resolv/Makefile (subdirs-dirs): Define.

Mon Dec 23 20:56:49 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/gnu/utmpbits.h (struct utmp): Fix padding.

Mon Dec 30 11:05:11 1996  Ulrich Drepper  <drepper@cygnus.com>

	Update from ADO tzcode1996o.
	* time/difftime.c: De-ANSI-declfy.  Simplify computation of hibit
	according to ADO version.
	* time/zic.c: Correct typo is message.

	Update from ADO tzdata1996n.
	* time/asia: Updated.
	* time/australasia: Likewise.
	* time/europe: Likewise.
	* time/northamerica: Likewise.
	* time/southamerica: Likewise.
1997-01-01 15:28:18 +00:00

129 lines
3.3 KiB
C

/* @(#)e_hypot.c 5.1 93/09/24 */
/*
* ====================================================
* 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.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $";
#endif
/* __ieee754_hypot(x,y)
*
* Method :
* If (assume round-to-nearest) z=x*x+y*y
* has error less than sqrt(2)/2 ulp, than
* sqrt(z) has error less than 1 ulp (exercise).
*
* So, compute sqrt(x*x+y*y) with some care as
* follows to get the error below 1 ulp:
*
* Assume x>y>0;
* (if possible, set rounding to round-to-nearest)
* 1. if x > 2y use
* x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
* where x1 = x with lower 32 bits cleared, x2 = x-x1; else
* 2. if x <= 2y use
* t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
* where t1 = 2x with lower 32 bits cleared, t2 = 2x-t1,
* y1= y with lower 32 bits chopped, y2 = y-y1.
*
* NOTE: scaling may be necessary if some argument is too
* large or too tiny
*
* Special cases:
* hypot(x,y) is INF if x or y is +INF or -INF; else
* hypot(x,y) is NAN if x or y is NAN.
*
* Accuracy:
* hypot(x,y) returns sqrt(x^2+y^2) with error less
* than 1 ulps (units in the last place)
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
double __ieee754_hypot(double x, double y)
#else
double __ieee754_hypot(x,y)
double x, y;
#endif
{
double a,b,t1,t2,y1,y2,w;
int32_t j,k,ha,hb;
GET_HIGH_WORD(ha,x);
ha &= 0x7fffffff;
GET_HIGH_WORD(hb,y);
hb &= 0x7fffffff;
if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
SET_HIGH_WORD(a,ha); /* a <- |a| */
SET_HIGH_WORD(b,hb); /* b <- |b| */
if((ha-hb)>0x3c00000) {return a+b;} /* x/y > 2**60 */
k=0;
if(ha > 0x5f300000) { /* a>2**500 */
if(ha >= 0x7ff00000) { /* Inf or NaN */
u_int32_t low;
w = a+b; /* for sNaN */
GET_LOW_WORD(low,a);
if(((ha&0xfffff)|low)==0) w = a;
GET_LOW_WORD(low,b);
if(((hb^0x7ff00000)|low)==0) w = b;
return w;
}
/* scale a and b by 2**-600 */
ha -= 0x25800000; hb -= 0x25800000; k += 600;
SET_HIGH_WORD(a,ha);
SET_HIGH_WORD(b,hb);
}
if(hb < 0x20b00000) { /* b < 2**-500 */
if(hb <= 0x000fffff) { /* subnormal b or 0 */
u_int32_t low;
GET_LOW_WORD(low,b);
if((hb|low)==0) return a;
t1=0;
SET_HIGH_WORD(t1,0x7fd00000); /* t1=2^1022 */
b *= t1;
a *= t1;
k -= 1022;
} else { /* scale a and b by 2^600 */
ha += 0x25800000; /* a *= 2^600 */
hb += 0x25800000; /* b *= 2^600 */
k -= 600;
SET_HIGH_WORD(a,ha);
SET_HIGH_WORD(b,hb);
}
}
/* medium size a and b */
w = a-b;
if (w>b) {
t1 = 0;
SET_HIGH_WORD(t1,ha);
t2 = a-t1;
w = __ieee754_sqrt(t1*t1-(b*(-b)-t2*(a+t1)));
} else {
a = a+a;
y1 = 0;
SET_HIGH_WORD(y1,hb);
y2 = b - y1;
t1 = 0;
SET_HIGH_WORD(t1,ha+0x00100000);
t2 = a - t1;
w = __ieee754_sqrt(t1*y1-(w*(-w)-(t1*y2+t2*b)));
}
if(k!=0) {
u_int32_t high;
t1 = 1.0;
GET_HIGH_WORD(high,t1);
SET_HIGH_WORD(t1,high+(k<<20));
return t1*w;
} else return w;
}