Welcome to mirror list, hosted at ThFree Co, Russian Federation.

git.blender.org/blender.git - Unnamed repository; edit this file 'description' to name the repository.
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat (limited to 'extern/carve/include/carve/cbrt.h')
-rw-r--r--extern/carve/include/carve/cbrt.h93
1 files changed, 0 insertions, 93 deletions
diff --git a/extern/carve/include/carve/cbrt.h b/extern/carve/include/carve/cbrt.h
deleted file mode 100644
index aeceab01426..00000000000
--- a/extern/carve/include/carve/cbrt.h
+++ /dev/null
@@ -1,93 +0,0 @@
-// N.B. only appropriate for IEEE doubles.
-// Cube root implementation obtained from code with the following notice:
-
-/* @(#)s_cbrt.c 1.3 95/01/18 */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunSoft, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- *
- */
-
-/* Sometimes it's necessary to define __LITTLE_ENDIAN explicitly
- but these catch some common cases. */
-
-#if defined(i386) || defined(i486) || \
- defined(intel) || defined(x86) || defined(i86pc) || \
- defined(__alpha) || defined(__osf__)
-#define __LITTLE_ENDIAN
-#endif
-
-#ifdef __LITTLE_ENDIAN
-#define __HI(x) *(1+(int*)&x)
-#define __LO(x) *(int*)&x
-#define __HIp(x) *(1+(int*)x)
-#define __LOp(x) *(int*)x
-#else
-#define __HI(x) *(int*)&x
-#define __LO(x) *(1+(int*)&x)
-#define __HIp(x) *(int*)x
-#define __LOp(x) *(1+(int*)x)
-#endif
-
-/* cbrt(x)
- * Return cube root of x
- */
-
-inline double cbrt(double x) {
-
- static const unsigned
- B1 = 715094163, /* B1 = (682-0.03306235651)*2**20 */
- B2 = 696219795; /* B2 = (664-0.03306235651)*2**20 */
- static const double
- C = 5.42857142857142815906e-01, /* 19/35 = 0x3FE15F15, 0xF15F15F1 */
- D = -7.05306122448979611050e-01, /* -864/1225 = 0xBFE691DE, 0x2532C834 */
- E = 1.41428571428571436819e+00, /* 99/70 = 0x3FF6A0EA, 0x0EA0EA0F */
- F = 1.60714285714285720630e+00, /* 45/28 = 0x3FF9B6DB, 0x6DB6DB6E */
- G = 3.57142857142857150787e-01; /* 5/14 = 0x3FD6DB6D, 0xB6DB6DB7 */
-
- int hx;
- double r,s,t=0.0,w;
- unsigned sign;
-
- hx = __HI(x); /* high word of x */
- sign=hx&0x80000000; /* sign= sign(x) */
- hx ^=sign;
- if(hx>=0x7ff00000) return(x+x); /* cbrt(NaN,INF) is itself */
- if((hx|__LO(x))==0)
- return(x); /* cbrt(0) is itself */
-
- __HI(x) = hx; /* x <- |x| */
- /* rough cbrt to 5 bits */
- if(hx<0x00100000) /* subnormal number */
- {__HI(t)=0x43500000; /* set t= 2**54 */
- t*=x; __HI(t)=__HI(t)/3+B2;
- }
- else
- __HI(t)=hx/3+B1;
-
-
- /* new cbrt to 23 bits, may be implemented in single precision */
- r=t*t/x;
- s=C+r*t;
- t*=G+F/(s+E+D/s);
-
- /* chopped to 20 bits and make it larger than cbrt(x) */
- __LO(t)=0; __HI(t)+=0x00000001;
-
- /* one step newton iteration to 53 bits with error less than 0.667 ulps */
- s=t*t; /* t*t is exact */
- r=x/s;
- w=t+t;
- r=(r-t)/(w+r); /* r-s is exact */
- t=t+t*r;
-
- /* retore the sign bit */
- __HI(t) |= sign;
- return(t);
-}