Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3362 | Serge | 1 | /* |
| 2 | * ==================================================== |
||
| 3 | * x87 FP implementation contributed to Newlib by |
||
| 4 | * Dave Korn, November 2007. This file is placed in the |
||
| 5 | * public domain. Permission to use, copy, modify, and |
||
| 6 | * distribute this software is freely granted. |
||
| 7 | * ==================================================== |
||
| 8 | */ |
||
| 9 | |||
| 10 | #if defined(__GNUC__) && !defined(_SOFT_FLOAT) |
||
| 11 | |||
| 12 | #include |
||
| 13 | |||
| 14 | /* |
||
| 15 | FUNCTION |
||
| 16 | < |
||
| 17 | INDEX |
||
| 18 | rint |
||
| 19 | INDEX |
||
| 20 | rintf |
||
| 21 | INDEX |
||
| 22 | rintl |
||
| 23 | |||
| 24 | ANSI_SYNOPSIS |
||
| 25 | #include |
||
| 26 | double rint(double x); |
||
| 27 | float rintf(float x); |
||
| 28 | long double rintl(long double x); |
||
| 29 | |||
| 30 | TRAD_SYNOPSIS |
||
| 31 | ANSI-only. |
||
| 32 | |||
| 33 | DESCRIPTION |
||
| 34 | The < |
||
| 35 | in floating-point format, using the current rounding direction. They may |
||
| 36 | raise the inexact exception if the result differs in value from the argument. |
||
| 37 | |||
| 38 | RETURNS |
||
| 39 | These functions return the rounded integer value of <[x]>. |
||
| 40 | |||
| 41 | PORTABILITY |
||
| 42 | < |
||
| 43 | < |
||
| 44 | < |
||
| 45 | floating point support is available and when compiling with GCC. |
||
| 46 | |||
| 47 | */ |
||
| 48 | |||
| 49 | /* |
||
| 50 | * Fast math version of rint(x) |
||
| 51 | * Return x rounded to integral value according to the prevailing |
||
| 52 | * rounding mode. |
||
| 53 | * Method: |
||
| 54 | * Using inline x87 asms. |
||
| 55 | * Exception: |
||
| 56 | * Governed by x87 FPCR. |
||
| 57 | */ |
||
| 58 | |||
| 59 | double _f_rint (double x) |
||
| 60 | { |
||
| 61 | double _result; |
||
| 62 | asm ("frndint" : "=t" (_result) : "0" (x)); |
||
| 63 | return _result; |
||
| 64 | } |
||
| 65 | |||
| 66 | #endif /* !__GNUC__ || _SOFT_FLOAT */ |
||
| 67 |