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/* Round a float 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 <math.h>
#include <math_private.h>
#include <stdint.h>
#include <libm-alias-float.h>
long long int
__llrintf (float x)
{
#ifdef _ARCH_PWR4
/* Assume powerpc64 instructions availability. */
long long int ret;
__asm__ ("fctid %0, %1" : "=d" (ret) : "d" (x));
return ret;
#else
float rx = rintf (x);
if (HAVE_PPC_FCTIDZ || rx != x)
return (long long int) rx;
else
{
float arx = fabsf (rx);
/* Avoid incorrect exceptions from libgcc conversions (as of GCC
5): <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>. */
if (arx < 0x1p31f)
return (long long int) (long int) rx;
else if (!(arx < 0x1p55f))
return (long long int) (long int) (rx * 0x1p-32f) << 32;
uint32_t i0;
GET_FLOAT_WORD (i0, rx);
int exponent = ((i0 >> 23) & 0xff) - 0x7f;
unsigned long long int mant = (i0 & 0x7fffff) | 0x800000;
mant <<= exponent - 23;
return (long long int) ((i0 & 0x80000000) != 0 ? -mant : mant);
}
#endif
}
libm_alias_float (__llrint, llrint)
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