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glibc/ports/sysdeps/alpha/fpu/s_trunc.c
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/* Copyright (C) 2007-2013 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library. If not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <math.h> | |
#include <math_ldbl_opt.h> | |
/* Use the chopped rounding mode conversion instructions to implement trunc. */ | |
double | |
__trunc (double x) | |
{ | |
double two52 = copysign (0x1.0p52, x); | |
double r, tmp; | |
__asm ( | |
#ifdef _IEEE_FP_INEXACT | |
"addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0" | |
#else | |
"addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0" | |
#endif | |
: "=&f"(r), "=&f"(tmp) | |
: "f"(x), "f"(two52)); | |
/* trunc(-0) == -0, and in general we'll always have the same | |
sign as our input. */ | |
return copysign (r, x); | |
} | |
weak_alias (__trunc, trunc) | |
#ifdef NO_LONG_DOUBLE | |
strong_alias (__trunc, __truncl) | |
weak_alias (__trunc, truncl) | |
#endif | |
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
compat_symbol (libm, __trunc, truncl, GLIBC_2_1); | |
#endif |