glibc
2.9

Go to the source code of this file.
Functions  
void  __mpexp (mp_no *x, mp_no *y, int p) 
double  __slowexp (double x) 
Definition at line 39 of file mpexp.c.
{ int i,j,k,m,m1,m2,n; double a,b; static const int np[33] = {0,0,0,0,3,3,4,4,5,4,4,5,5,5,6,6,6,6,6,6, 6,6,6,6,7,7,7,7,8,8,8,8,8}; static const int m1p[33]= {0,0,0,0,17,23,23,28,27,38,42,39,43,47,43,47,50,54, 57,60,64,67,71,74,68,71,74,77,70,73,76,78,81}; static const int m1np[7][18] = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, { 0, 0, 0, 0,36,48,60,72, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, { 0, 0, 0, 0,24,32,40,48,56,64,72, 0, 0, 0, 0, 0, 0, 0}, { 0, 0, 0, 0,17,23,29,35,41,47,53,59,65, 0, 0, 0, 0, 0}, { 0, 0, 0, 0, 0, 0,23,28,33,38,42,47,52,57,62,66, 0, 0}, { 0, 0, 0, 0, 0, 0, 0, 0,27, 0, 0,39,43,47,51,55,59,63}, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,43,47,50,54}}; mp_no mpone = {0,{0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0, 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0, 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0}}; mp_no mpk = {0,{0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0, 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0, 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0}}; mp_no mps,mpak,mpt1,mpt2; /* Choose m,n and compute a=2**(m) */ n = np[p]; m1 = m1p[p]; a = twomm1[p].d; for (i=0; i<EX; i++) a *= RADIXI; for ( ; i>EX; i) a *= RADIX; b = X[1]*RADIXI; m2 = 24*EX; for (; b<HALF; m2) { a *= TWO; b *= TWO; } if (b == HALF) { for (i=2; i<=p; i++) { if (X[i]!=ZERO) break; } if (i==p+1) { m2; a *= TWO; } } if ((m=m1+m2) <= 0) { m=0; a=ONE; for (i=n1; i>0; i,n) { if (m1np[i][p]+m2>0) break; } } /* Compute s=x*2**(m). Put result in mps */ __dbl_mp(a,&mpt1,p); __mul(x,&mpt1,&mps,p); /* Evaluate the polynomial. Put result in mpt2 */ mpone.e=1; mpone.d[0]=ONE; mpone.d[1]=ONE; mpk.e = 1; mpk.d[0] = ONE; mpk.d[1]=nn[n].d; __dvd(&mps,&mpk,&mpt1,p); __add(&mpone,&mpt1,&mpak,p); for (k=n1; k>1; k) { __mul(&mps,&mpak,&mpt1,p); mpk.d[1]=nn[k].d; __dvd(&mpt1,&mpk,&mpt2,p); __add(&mpone,&mpt2,&mpak,p); } __mul(&mps,&mpak,&mpt1,p); __add(&mpone,&mpt1,&mpt2,p); /* Raise polynomial value to the power of 2**m. Put result in y */ for (k=0,j=0; k<m; ) { __mul(&mpt2,&mpt2,&mpt1,p); k++; if (k==m) { j=1; break; } __mul(&mpt1,&mpt1,&mpt2,p); k++; } if (j) __cpy(&mpt1,y,p); else __cpy(&mpt2,y,p); return; }
double __slowexp  (  double  x  ) 
Definition at line 37 of file slowexp.c.
{ double w,z,res,eps=3.0e26; #if 0 double y; #endif int p; #if 0 int orig,i; #endif mp_no mpx, mpy, mpz,mpw,mpeps,mpcor; p=6; __dbl_mp(x,&mpx,p); /* Convert a double precision number x */ /* into a multiple precision number mpx with prec. p. */ __mpexp(&mpx, &mpy, p); /* MultiPrecision exponential function */ __dbl_mp(eps,&mpeps,p); __mul(&mpeps,&mpy,&mpcor,p); __add(&mpy,&mpcor,&mpw,p); __sub(&mpy,&mpcor,&mpz,p); __mp_dbl(&mpw, &w, p); __mp_dbl(&mpz, &z, p); if (w == z) return w; else { /* if calculating is not exactly */ p = 32; __dbl_mp(x,&mpx,p); __mpexp(&mpx, &mpy, p); __mp_dbl(&mpy, &res, p); return res; } }