version 1.23, 2002/09/27 08:40:48 |
version 1.27, 2002/11/01 05:43:35 |
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/* $OpenXM: OpenXM_contrib2/asir2000/engine/Hgfs.c,v 1.22 2002/09/27 04:24:04 noro Exp $ */ |
/* $OpenXM: OpenXM_contrib2/asir2000/engine/Hgfs.c,v 1.26 2002/10/25 02:43:40 noro Exp $ */ |
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#include "ca.h" |
#include "ca.h" |
#include "inline.h" |
#include "inline.h" |
Line 16 int comp_dum(DUM a,DUM b) |
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Line 16 int comp_dum(DUM a,DUM b) |
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return 0; |
return 0; |
} |
} |
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void fctrsf(P p,DCP *dcp) |
void ufctrsf(P p,DCP *dcp) |
{ |
{ |
int n,i,j,k; |
int n,i,j,k; |
DCP dc,dc0; |
DCP dc,dc0; |
Line 669 int sfberle(VL vl,P f,int count,GFS *ev,DCP *dcp) |
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Line 669 int sfberle(VL vl,P f,int count,GFS *ev,DCP *dcp) |
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ptosfum(f0,wf); cpyum(wf,wf1); |
ptosfum(f0,wf); cpyum(wf,wf1); |
diffsfum(wf1,wf2); gcdsfum(wf1,wf2,gcd); |
diffsfum(wf1,wf2); gcdsfum(wf1,wf2,gcd); |
if ( DEG(gcd) == 0 ) { |
if ( DEG(gcd) == 0 ) { |
fctrsf(f0,&dc); |
ufctrsf(f0,&dc); |
for ( dct = NEXT(dc), i = 0; dct; dct = NEXT(dct), i++ ); |
for ( dct = NEXT(dc), i = 0; dct; dct = NEXT(dct), i++ ); |
if ( i < fn ) { |
if ( i < fn ) { |
dc0 = dc; fn = i; fm = m; |
dc0 = dc; fn = i; fm = m; |
Line 821 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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Line 821 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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cpyum(COEF(hk)[i],COEF(f)[i]); |
cpyum(COEF(hk)[i],COEF(f)[i]); |
} |
} |
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/* a0*g+b0*h = 1 mod y -> a*g+b*h = 1 mod y^(dy+1) */ |
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void sfexgcd_by_hensel(BM g,BM h,int dy,BM *ap,BM *bp) |
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{ |
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int i,k; |
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int dx; |
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UM wt,wa,wb,q,w1,w2,ws; |
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UM wc,wd,we,wz,wa1,wb1; |
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BM wz0,wz1; |
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int dg,dh; |
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BM a,b,c; |
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dg = degbm(g); |
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dh = degbm(h); |
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dx = dg+dh; |
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a = BMALLOC(dh,dy); |
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b = BMALLOC(dg,dy); |
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/* c holds a*g+b*h-1 */ |
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c = BMALLOC(dg+dh,dy); |
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W_BMALLOC(dx,dy,wz0); W_BMALLOC(dx,dy,wz1); |
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wt = W_UMALLOC(dx); ws = W_UMALLOC(dx); q = W_UMALLOC(2*dx); |
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wa1 = W_UMALLOC(2*dx); wb1 = W_UMALLOC(2*dx); |
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wc = W_UMALLOC(2*dx); wd = W_UMALLOC(2*dx); |
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we = W_UMALLOC(2*dx); wz = W_UMALLOC(2*dx); |
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/* compute wa,wb s.t. wa*g0+wb*h0 = 1 mod y */ |
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w1 = W_UMALLOC(dg); cpyum(COEF(g)[0],w1); |
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w2 = W_UMALLOC(dh); cpyum(COEF(h)[0],w2); |
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wa = W_UMALLOC(2*dx); wb = W_UMALLOC(2*dx); /* XXX */ |
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eucsfum(w1,w2,wa,wb); |
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cpyum(wa,COEF(a)[0]); cpyum(wb,COEF(b)[0]); |
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/* initialize c to a*g+b*h-1 */ |
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mulsfbm(a,g,c); mulsfbm(b,h,wz0); addtosfbm(wz0,c); |
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COEF(COEF(c)[0])[0] = 0; |
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fprintf(stderr,"dy=%d\n",dy); |
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for ( k = 1; k <= dy; k++ ) { |
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fprintf(stderr,"."); |
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/* at this point, a*g+b*h = 1 mod y^k, c = a*g+b*h-1 */ |
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/* wt = -((a*g+b*h-1)/y^k) */ |
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cpyum(COEF(c)[k],wt); |
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for ( i = DEG(wt); i >= 0; i-- ) |
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COEF(wt)[i] = _chsgnsf(COEF(wt)[i]); |
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/* compute wa1,wb1 s.t. wa1*g0+wb1*h0 = wt */ |
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mulsfum(wa,wt,wa1); DEG(wa1) = divsfum(wa1,COEF(h)[0],q); |
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mulsfum(wa1,COEF(g)[0],wc); subsfum(wt,wc,wd); |
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DEG(wd) = divsfum(wd,COEF(h)[0],wb1); |
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/* c += ((wa1*g+wb1*h)*y^k mod y^(dy+1) */ |
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/* wz0 = wa1*y^k */ |
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clearbm(dx,wz0); |
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cpyum(wa1,COEF(wz0)[k]); |
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/* wz1 = wz0*g mod y^(dy+1) */ |
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clearbm(dx,wz1); |
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mulsfbm(g,wz0,wz1); |
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/* c += wz1 */ |
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addtosfbm(wz1,c); |
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/* wz0 = wb1*y^k */ |
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clearbm(dx,wz0); |
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cpyum(wb1,COEF(wz0)[k]); |
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/* wz1 = wz0*h mod y^(dy+1) */ |
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clearbm(dx,wz1); |
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mulsfbm(h,wz0,wz1); |
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/* c += wz1 */ |
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addtosfbm(wz1,c); |
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/* a += wa1*y^k, b += wb1*y^k */ |
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cpyum(wa1,COEF(a)[k]); |
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cpyum(wb1,COEF(b)[k]); |
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} |
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fprintf(stderr,"\n"); |
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DEG(a) = dy; |
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DEG(b) = dy; |
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*ap = a; |
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*bp = b; |
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} |
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/* fl->c[i] = coef_y(f,i) */ |
/* fl->c[i] = coef_y(f,i) */ |
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void ptosfbm(int dy,P f,BM fl) |
void ptosfbm(int dy,P f,BM fl) |
Line 898 void sfsqfr(P f,DCP *dcp) |
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Line 985 void sfsqfr(P f,DCP *dcp) |
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NEWDC(dc); DEG(dc) = ONE; COEF(dc) = f; NEXT(dc) = 0; *dcp = dc; |
NEWDC(dc); DEG(dc) = ONE; COEF(dc) = f; NEXT(dc) = 0; *dcp = dc; |
} else if ( !NEXT(vl) ) |
} else if ( !NEXT(vl) ) |
sfusqfr(f,dcp); |
sfusqfr(f,dcp); |
#if 0 |
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else if ( !NEXT(NEXT(vl)) ) |
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sfbsqfr(f,vl->v,NEXT(vl)->v,dcp); |
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#endif |
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else |
else |
error("sfsqfr : not implemented yet"); |
sqfrsf(f,dcp); |
} |
} |
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void sfusqfr(P f,DCP *dcp) |
void sfusqfr(P f,DCP *dcp) |
Line 934 void sfusqfr(P f,DCP *dcp) |
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Line 1017 void sfusqfr(P f,DCP *dcp) |
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*dcp = dct; |
*dcp = dct; |
} |
} |
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#if 0 |
void sfbsqfrmain(P f,V x,V y,DCP *dcp) |
void sfbsqfrmain(P f,V x,V y,DCP *dcp) |
{ |
{ |
/* XXX*/ |
/* XXX*/ |
Line 977 void sfbsqfr(P f,V x,V y,DCP *dcp) |
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Line 1061 void sfbsqfr(P f,V x,V y,DCP *dcp) |
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*dcp = dcx; |
*dcp = dcx; |
} |
} |
} |
} |
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#endif |
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void sfdtest(P,ML,V,V,DCP *); |
void sfdtest(P,ML,V,V,DCP *); |
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Line 1013 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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Line 1098 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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} |
} |
} |
} |
*dcp = dc; |
*dcp = dc; |
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} |
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/* returns shifted f, shifted factors and the eval pt */ |
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void sfbfctr_shift(P f,V x,V y,int degbound,GFS *evp,P *sfp,DCP *dcp) |
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{ |
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ML list; |
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P sf; |
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GFS ev; |
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DCP dc,dct; |
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int dx,dy; |
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/* sf(x) = f(x+ev) = list->c[0]*list->c[1]*... */ |
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sfhensel(5,f,x,degbound,&ev,&sf,&list); |
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if ( list->n == 0 ) |
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error("sfbfctr_shift : short of evaluation points"); |
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else if ( list->n == 1 ) { |
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/* f is irreducible */ |
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NEWDC(dc); DEG(dc) = ONE; COEF(dc) = f; NEXT(dc) = 0; |
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*evp = 0; |
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*sfp = f; |
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*dcp = dc; |
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} else { |
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sfdtest(sf,list,x,y,dcp); |
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*evp = ev; |
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*sfp = sf; |
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} |
} |
} |
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/* f = f(x,y) = list->c[0]*list->c[1]*... mod y^(list->bound+1) */ |
/* f = f(x,y) = list->c[0]*list->c[1]*... mod y^(list->bound+1) */ |