|
Last change
on this file since 662 was
469,
checked in by alain, 6 years ago
|
|
1) Introduce the libsemaphore library.
2) Introduce a small libmath library, required by the "fft" application..
3) Introduce the multithreaded "fft" application.
4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.
|
|
File size:
753 bytes
|
| Line | |
|---|
| 1 | /* |
|---|
| 2 | * ==================================================== |
|---|
| 3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 4 | * |
|---|
| 5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
|---|
| 6 | * Permission to use, copy, modify, and distribute this |
|---|
| 7 | * software is freely granted, provided that this notice |
|---|
| 8 | * is preserved. |
|---|
| 9 | * ==================================================== |
|---|
| 10 | */ |
|---|
| 11 | |
|---|
| 12 | /* |
|---|
| 13 | * Modified for ALMOS-MKH OS at UPMC, France, August 2018. (Alain Greiner) |
|---|
| 14 | */ |
|---|
| 15 | |
|---|
| 16 | |
|---|
| 17 | /* |
|---|
| 18 | * isnan(x) returns 1 is x is nan, else 0; |
|---|
| 19 | * no branching! |
|---|
| 20 | */ |
|---|
| 21 | |
|---|
| 22 | #include "math.h" |
|---|
| 23 | #include "math_private.h" |
|---|
| 24 | |
|---|
| 25 | int isnan(double x) |
|---|
| 26 | { |
|---|
| 27 | int32_t hx,lx; |
|---|
| 28 | EXTRACT_WORDS(hx,lx,x); |
|---|
| 29 | hx &= 0x7fffffff; |
|---|
| 30 | hx |= (uint32_t)(lx|(-lx))>>31; |
|---|
| 31 | hx = 0x7ff00000 - hx; |
|---|
| 32 | return (int)(((uint32_t)hx)>>31); |
|---|
| 33 | } |
|---|
Note: See
TracBrowser
for help on using the repository browser.
