mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-02 18:53:22 +00:00
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
|
|
* ====================================================
|
|
* x87 FP implementation contributed to Newlib by
|
|
* Dave Korn, November 2007. This file is placed in the
|
|
* public domain. Permission to use, copy, modify, and
|
|
* distribute this software is freely granted.
|
|
* ====================================================
|
|
*/
|
|
|
|
#ifdef __GNUC__
|
|
#if !defined(_SOFT_FLOAT)
|
|
|
|
#include <math.h>
|
|
|
|
/*
|
|
FUNCTION
|
|
<<llrint>>, <<llrintf>>, <<llrintl>>---round and convert to long long integer
|
|
INDEX
|
|
llrint
|
|
INDEX
|
|
llrintf
|
|
INDEX
|
|
llrintl
|
|
|
|
SYNOPSIS
|
|
#include <math.h>
|
|
long long int llrint(double x);
|
|
long long int llrintf(float x);
|
|
long long int llrintl(long double x);
|
|
|
|
DESCRIPTION
|
|
The <<llrint>>, <<llrintf>> and <<llrintl>> functions round <[x]> to the nearest integer value,
|
|
according to the current rounding direction. If the rounded value is outside the
|
|
range of the return type, the numeric result is unspecified. A range error may
|
|
occur if the magnitude of <[x]> is too large.
|
|
|
|
RETURNS
|
|
These functions return the rounded integer value of <[x]>.
|
|
<<llrint>>, <<llrintf>> and <<llrintl>> return the result as a long long integer.
|
|
|
|
PORTABILITY
|
|
<<llrint>>, <<llrintf>> and <<llrintl>> are ANSI.
|
|
The fast math versions of <<llrint>>, <<llrintf>> and <<llrintl>> are only
|
|
available on i386 platforms when hardware floating point support is available
|
|
and when compiling with GCC.
|
|
|
|
*/
|
|
|
|
/*
|
|
* Fast math version of llrint(x)
|
|
* Return x rounded to integral value according to the prevailing
|
|
* rounding mode.
|
|
* Method:
|
|
* Using inline x87 asms.
|
|
* Exception:
|
|
* Governed by x87 FPCR.
|
|
*/
|
|
|
|
long long int _f_llrint (double x)
|
|
{
|
|
long long int _result;
|
|
asm ("fistpll %0" : "=m" (_result) : "t" (x) : "st");
|
|
return _result;
|
|
}
|
|
|
|
#endif /* !_SOFT_FLOAT */
|
|
#endif /* __GNUC__ */
|