| /* |
| * ==================================================== |
| * 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. |
| * ==================================================== |
| */ |
| |
| #if defined(__GNUC__) && !defined(_SOFT_FLOAT) |
| |
| #include <math.h> |
| |
| /* |
| FUNCTION |
| <<lrint>>, <<lrintf>>, <<lrintl>>---round and convert to long integer |
| INDEX |
| lrint |
| INDEX |
| lrintf |
| INDEX |
| lrintl |
| |
| ANSI_SYNOPSIS |
| #include <math.h> |
| long int lrint(double x); |
| long int lrintf(float x); |
| long int lrintl(long double x); |
| |
| TRAD_SYNOPSIS |
| ANSI-only. |
| |
| DESCRIPTION |
| The <<lrint>>, <<lrintf>> and <<lrintl>> 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]>. |
| <<lrint>>, <<lrintf>> and <<lrintl>> return the result as a long integer. |
| |
| PORTABILITY |
| <<lrint>>, <<lrintf>>, and <<lrintl>> are ANSI. |
| <<lrint>> and <<lrintf>> are available on all platforms. |
| <<lrintl>> is only available on i386 platforms when hardware |
| floating point support is available and when compiling with GCC. |
| |
| */ |
| |
| /* |
| * Fast math version of lrint(x) |
| * Return x rounded to integral value according to the prevailing |
| * rounding mode. |
| * Method: |
| * Using inline x87 asms. |
| * Exception: |
| * Governed by x87 FPCR. |
| */ |
| |
| long int _f_lrint (double x) |
| { |
| long int _result; |
| asm ("fistpl %0" : "=m" (_result) : "t" (x) : "st"); |
| return _result; |
| } |
| |
| #endif /* !__GNUC__ || _SOFT_FLOAT */ |
| |
