diff options
Diffstat (limited to 'gcc/testsuite/gcc.c-torture/execute/cbrt.c')
-rwxr-xr-x | gcc/testsuite/gcc.c-torture/execute/cbrt.c | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/cbrt.c b/gcc/testsuite/gcc.c-torture/execute/cbrt.c deleted file mode 100755 index 8659cc7..0000000 --- a/gcc/testsuite/gcc.c-torture/execute/cbrt.c +++ /dev/null @@ -1,92 +0,0 @@ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== -*/ - -#ifndef __vax__ -static const unsigned long - 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 */ - -double -cbrtl (double x) -{ - long hx; - double r,s,w; - double lt; - unsigned sign; - typedef unsigned unsigned32 __attribute__((mode(SI))); - union { - double t; - unsigned32 pt[2]; - } ut, ux; - int n0; - - ut.t = 1.0; - n0 = (ut.pt[0] == 0); - - ut.t = 0.0; - ux.t = x; - - hx = ux.pt[n0]; /* 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| ux.pt[1-n0])==0) - return(ux.t); /* cbrt(0) is itself */ - - ux.pt[n0] = hx; - /* rough cbrt to 5 bits */ - if(hx<0x00100000) /* subnormal number */ - {ut.pt[n0]=0x43500000; /* set t= 2**54 */ - ut.t*=x; ut.pt[n0]=ut.pt[n0]/3+B2; - } - else - ut.pt[n0]=hx/3+B1; - - /* new cbrt to 23 bits, may be implemented in single precision */ - r=ut.t*ut.t/ux.t; - s=C+r*ut.t; - ut.t*=G+F/(s+E+D/s); - - /* chopped to 20 bits and make it larger than cbrt(x) */ - ut.pt[1-n0]=0; ut.pt[n0]+=0x00000001; - - /* one step newton iteration to 53 bits with error less than 0.667 ulps */ - s=ut.t*ut.t; /* t*t is exact */ - r=ux.t/s; - w=ut.t+ut.t; - r=(r-ut.t)/(w+r); /* r-s is exact */ - ut.t=ut.t+ut.t*r; - - /* restore the sign bit */ - ut.pt[n0] |= sign; - - lt = ut.t; - lt -= (lt - (x/(lt*lt))) * 0.333333333333333333333; - return lt; -} - -main () -{ - if ((int) (cbrtl (27.0) + 0.5) != 3) - abort (); - - exit (0); -} -#else -main () { exit (0); } -#endif |