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/* Round a double value to a long long in the current rounding mode.
Copyright (C) 1997-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <limits.h>
#include <math.h>
#include <math_ldbl_opt.h>
#include <math_private.h>
#include <stdint.h>
#include <libm-alias-double.h>
long long int
__llrint (double x)
{
#ifdef _ARCH_PWR4
/* Assume powerpc64 instructions availability. */
long long int ret;
__asm__ ("fctid %0, %1" : "=d" (ret) : "d" (x));
return ret;
#else
double rx = rint (x);
if (HAVE_PPC_FCTIDZ || rx != x)
return (long long int) rx;
else
{
/* Avoid incorrect exceptions from libgcc conversions (as of GCC
5): <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>. */
if (fabs (rx) < 0x1p31)
return (long long int) (long int) rx;
uint64_t i0;
EXTRACT_WORDS64 (i0, rx);
int exponent = ((i0 >> 52) & 0x7ff) - 0x3ff;
if (exponent < 63)
{
unsigned long long int mant
= (i0 & ((1ULL << 52) - 1)) | (1ULL << 52);
if (exponent < 52)
mant >>= 52 - exponent;
else
mant <<= exponent - 52;
return (long long int) ((i0 & (1ULL << 63)) != 0 ? -mant : mant);
}
else if (rx == (double) LLONG_MIN)
return LLONG_MIN;
else
return (long long int) (long int) rx << 32;
}
#endif
}
#ifndef __llrint
libm_alias_double (__llrint, llrint)
#endif
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