glibc/sysdeps/alpha/fpu/s_floor.c
Ulrich Drepper 6eaccb759a Update.
1999-01-29  Richard Henderson  <rth@twiddle.net>

	* scripts/config.sub: Recognize alpha{pca5[67],ev[67]}.

	* sysdeps/generic/elf/backtracesyms.c (__backtrace_symbols):
	Format pointer differences as longs.

	* sysdeps/alpha/fpu/s_floor.c, sysdeps/alpha/fpu/s_floorf.c:
	Copy commentary from bits/mathinclude.h.  Kill unused defines.

	* sysdeps/alpha/atomicity.h: New file.
1999-01-29 16:58:13 +00:00

52 lines
1.6 KiB
C

/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <math.h>
/* Use the -inf rounding mode conversion instructions to implement
floor. We note when the exponent is large enough that the value
must be integral, as this avoids unpleasant integer overflows. */
double
__floor (double x)
{
/* Check not zero since floor(-0) == -0. */
if (x != 0 && fabs (x) < 9007199254740992.0) /* 1 << DBL_MANT_DIG */
{
double __tmp1;
__asm (
#ifdef _IEEE_FP_INEXACT
"cvttq/svim %2,%1\n\t"
#else
"cvttq/svm %2,%1\n\t"
#endif
"cvtqt/m %1,%0\n\t"
: "=f"(x), "=&f"(__tmp1)
: "f"(x));
}
return x;
}
weak_alias (__floor, floor)
#ifdef NO_LONG_DOUBLE
strong_alias (__floor, __floorl)
weak_alias (__floor, floorl)
#endif