version 1.22, 2002/09/27 04:24:04 |
version 1.32, 2015/08/08 14:19:41 |
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/* $OpenXM: OpenXM_contrib2/asir2000/engine/Hgfs.c,v 1.21 2001/11/19 00:57:11 noro Exp $ */ |
/* $OpenXM: OpenXM_contrib2/asir2000/engine/Hgfs.c,v 1.31 2015/03/16 00:08:32 noro Exp $ */ |
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#include "ca.h" |
#include "ca.h" |
#include "inline.h" |
#include "inline.h" |
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int debug_sfbfctr; |
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void lnfsf(int n,UM p0,UM p1,struct p_pair *list,UM np0,UM np1); |
void lnfsf(int n,UM p0,UM p1,struct p_pair *list,UM np0,UM np1); |
void extractcoefbm(BM f,int dx,UM r); |
void extractcoefbm(BM f,int dx,UM r); |
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Line 16 int comp_dum(DUM a,DUM b) |
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Line 18 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 79 void gensqfrsfum(UM p,struct oDUM *dc) |
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Line 81 void gensqfrsfum(UM p,struct oDUM *dc) |
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{ |
{ |
int n,i,j,d,mod; |
int n,i,j,d,mod; |
UM t,s,g,f,f1,b; |
UM t,s,g,f,f1,b; |
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GFS u,v; |
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if ( (n = DEG(p)) == 1 ) { |
if ( (n = DEG(p)) == 1 ) { |
dc[0].f = UMALLOC(DEG(p)); cpyum(p,dc[0].f); dc[0].n = 1; |
dc[0].f = UMALLOC(DEG(p)); cpyum(p,dc[0].f); dc[0].n = 1; |
Line 117 void gensqfrsfum(UM p,struct oDUM *dc) |
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Line 120 void gensqfrsfum(UM p,struct oDUM *dc) |
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break; |
break; |
else { |
else { |
DEG(s) = DEG(t)/mod; |
DEG(s) = DEG(t)/mod; |
for ( j = 0; j <= DEG(t); j++ ) |
for ( j = 0; j <= DEG(t); j++ ) { |
COEF(s)[j] = COEF(t)[j*mod]; |
iftogfs(COEF(t)[j*mod],&u); |
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pthrootgfs(u,&v); |
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COEF(s)[j] = v?FTOIF(CONT(v)):0; |
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} |
cpyum(s,b); d *= mod; |
cpyum(s,b); d *= mod; |
} |
} |
} |
} |
Line 506 void canzassf(UM f,int d,UM *r) |
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Line 512 void canzassf(UM f,int d,UM *r) |
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/* Hensel related functions */ |
/* Hensel related functions */ |
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int sfberle(VL,P,int,GFS *,DCP *); |
int sfberle(V,V,P,int,GFS *,DCP *); |
void sfgcdgen(P,ML,ML *); |
void sfgcdgen(P,ML,ML *); |
void sfhenmain2(BM,UM,UM,int,BM *); |
void sfhenmain2(BM,UM,UM,int,BM *); |
void ptosfbm(int,P,BM); |
void ptosfbm(int,P,BM); |
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void sfhensel(int count,P f,V x,V y,int degbound,GFS *evp,P *sfp,ML *listp); |
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/* f = f(x,y) */ |
/* f = f(x,y) */ |
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void sfhensel(int count,P f,V x,int degbound,GFS *evp,P *sfp,ML *listp) |
void sfhensel(int count,P f,V x,V y,int degbound,GFS *evp,P *sfp,ML *listp) |
{ |
{ |
int i; |
int i; |
int fn; |
int fn; |
ML rlist; |
ML rlist; |
BM fl; |
BM fl; |
VL vl,nvl; |
VL vl,nvl; |
V y; |
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int dx,dy,bound; |
int dx,dy,bound; |
GFS ev; |
GFS ev; |
P f1,t,c,sf; |
P f1,t,c,sf; |
Line 534 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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Line 540 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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reordvar(vl,x,&nvl); reorderp(nvl,vl,f,&f1); |
reordvar(vl,x,&nvl); reorderp(nvl,vl,f,&f1); |
vl = nvl; f = f1; |
vl = nvl; f = f1; |
} |
} |
y = vl->next->v; |
if ( vl->next ) |
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y = vl->next->v; |
dx = getdeg(x,f); |
dx = getdeg(x,f); |
dy = getdeg(y,f); |
dy = getdeg(y,f); |
if ( dx == 1 ) { |
if ( dx == 1 ) { |
*listp = rlist = MLALLOC(1); rlist->n = 1; rlist->c[0] = 0; |
*listp = rlist = MLALLOC(1); rlist->n = 1; rlist->c[0] = 0; |
return; |
return; |
} |
} |
fn = sfberle(vl,f,count,&ev,&dc); |
fn = sfberle(x,y,f,count,&ev,&dc); |
if ( fn <= 1 ) { |
if ( fn <= 1 ) { |
/* fn == 0 => short of evaluation points */ |
/* fn == 0 => short of evaluation points */ |
*listp = rlist = MLALLOC(1); rlist->n = fn; rlist->c[0] = 0; |
*listp = rlist = MLALLOC(1); rlist->n = fn; rlist->c[0] = 0; |
Line 604 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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Line 611 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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q = W_UMALLOC(dx); |
q = W_UMALLOC(dx); |
rlist = MLALLOC(fn); rlist->n = fn; rlist->bound = bound; |
rlist = MLALLOC(fn); rlist->n = fn; rlist->bound = bound; |
fprintf(asir_out,"%d candidates\n",fn); |
if ( debug_sfbfctr ) |
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fprintf(asir_out,"%d candidates\n",fn); |
init_eg(&eg_hensel); |
init_eg(&eg_hensel); |
for ( i = 0; i < fn-1; i++ ) { |
for ( i = 0; i < fn-1; i++ ) { |
fprintf(asir_out,"deg(fm) = %d, deg(gm[%d]) = %d\n", |
if ( debug_sfbfctr ) |
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fprintf(asir_out,"deg(fm) = %d, deg(gm[%d]) = %d\n", |
DEG(fm),i,DEG(gm[i])); |
DEG(fm),i,DEG(gm[i])); |
init_eg(&eg_hensel_t); |
init_eg(&eg_hensel_t); |
get_eg(&tmp0); |
get_eg(&tmp0); |
Line 619 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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Line 628 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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cpyum(hm,fm); |
cpyum(hm,fm); |
get_eg(&tmp1); add_eg(&eg_hensel_t,&tmp0,&tmp1); |
get_eg(&tmp1); add_eg(&eg_hensel_t,&tmp0,&tmp1); |
add_eg(&eg_hensel,&tmp0,&tmp1); |
add_eg(&eg_hensel,&tmp0,&tmp1); |
print_eg("Hensel",&eg_hensel_t); |
if ( debug_sfbfctr) { |
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print_eg("Hensel",&eg_hensel_t); |
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fprintf(asir_out,"\n"); |
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} |
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} |
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if ( debug_sfbfctr) { |
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print_eg("Hensel total",&eg_hensel); |
fprintf(asir_out,"\n"); |
fprintf(asir_out,"\n"); |
} |
} |
print_eg("Hensel total",&eg_hensel); |
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fprintf(asir_out,"\n"); |
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/* finally, fl must be the lift of gm[fn-1] */ |
/* finally, fl must be the lift of gm[fn-1] */ |
rlist->c[i] = fl; |
rlist->c[i] = fl; |
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Line 640 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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Line 653 void sfhensel(int count,P f,V x,int degbound,GFS *evp, |
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/* main variable of f = x */ |
/* main variable of f = x */ |
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int sfberle(VL vl,P f,int count,GFS *ev,DCP *dcp) |
int sfberle(V x,V y,P f,int count,GFS *ev,DCP *dcp) |
{ |
{ |
UM wf,wf1,wf2,wfs,gcd; |
UM wf,wf1,wf2,wfs,gcd; |
int fn,n; |
int fn,n; |
GFS m,fm; |
GFS m,fm; |
DCP dc,dct,dc0; |
DCP dc,dct,dc0; |
VL nvl; |
VL vl; |
V x,y; |
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P lc,lc0,f0; |
P lc,lc0,f0; |
Obj obj; |
Obj obj; |
int j,q1,index,i; |
int j,q,index,i; |
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clctv(vl,f,&nvl); vl = nvl; |
NEWVL(vl); vl->v = x; |
x = vl->v; y = vl->next->v; |
NEWVL(NEXT(vl)); NEXT(vl)->v = y; |
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NEXT(NEXT(vl)) =0; |
simp_ff((Obj)f,&obj); f = (P)obj; |
simp_ff((Obj)f,&obj); f = (P)obj; |
n = QTOS(DEG(DC(f))); |
n = QTOS(DEG(DC(f))); |
wf = W_UMALLOC(n); wf1 = W_UMALLOC(n); wf2 = W_UMALLOC(n); |
wf = W_UMALLOC(n); wf1 = W_UMALLOC(n); wf2 = W_UMALLOC(n); |
wfs = W_UMALLOC(n); gcd = W_UMALLOC(n); |
wfs = W_UMALLOC(n); gcd = W_UMALLOC(n); |
q1 = field_order_sf()-1; |
q = field_order_sf(); |
lc = DC(f)->c; |
lc = DC(f)->c; |
for ( j = 0, fn = n + 1, index = 0; |
for ( j = 0, fn = n + 1, index = 0; |
index < q1 && j < count && fn > 1; index++ ) { |
index < q && j < count && fn > 1; index++ ) { |
MKGFS(index,m); |
indextogfs(index,&m); |
substp(vl,lc,y,(P)m,&lc0); |
substp(vl,lc,y,(P)m,&lc0); |
if ( lc0 ) { |
if ( lc0 ) { |
substp(vl,f,y,(P)m,&f0); |
substp(vl,f,y,(P)m,&f0); |
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 678 int sfberle(VL vl,P f,int count,GFS *ev,DCP *dcp) |
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Line 691 int sfberle(VL vl,P f,int count,GFS *ev,DCP *dcp) |
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} |
} |
} |
} |
} |
} |
if ( index == q1 ) |
if ( index == q ) |
return 0; |
return 0; |
else if ( fn == 1 ) |
else if ( fn == 1 ) |
return 1; |
return 1; |
Line 756 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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Line 769 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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wa = W_UMALLOC(2*dx); wb = W_UMALLOC(2*dx); /* XXX */ |
wa = W_UMALLOC(2*dx); wb = W_UMALLOC(2*dx); /* XXX */ |
eucsfum(w1,w2,wa,wb); |
eucsfum(w1,w2,wa,wb); |
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fprintf(stderr,"dy=%d\n",dy); |
if ( debug_sfbfctr) |
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fprintf(stderr,"dy=%d\n",dy); |
for ( k = 1; k <= dy; k++ ) { |
for ( k = 1; k <= dy; k++ ) { |
fprintf(stderr,"."); |
if ( debug_sfbfctr) |
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fprintf(stderr,"."); |
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/* at this point, f = gk*hk mod y^k */ |
/* at this point, f = gk*hk mod y^k */ |
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Line 814 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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Line 829 void sfhenmain2(BM f,UM g0,UM h0,int dy,BM *gp) |
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cpyum(wg1,COEF(gk)[k]); |
cpyum(wg1,COEF(gk)[k]); |
cpyum(wh1,COEF(hk)[k]); |
cpyum(wh1,COEF(hk)[k]); |
} |
} |
fprintf(stderr,"\n"); |
if ( debug_sfbfctr) |
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fprintf(stderr,"\n"); |
*gp = gk; |
*gp = gk; |
DEG(f) = dy; |
DEG(f) = dy; |
for ( i = 0; i <= dy; i++ ) |
for ( i = 0; i <= dy; i++ ) |
cpyum(COEF(hk)[i],COEF(f)[i]); |
cpyum(COEF(hk)[i],COEF(f)[i]); |
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#if defined(__MINGW32__) || defined(__MINGW64__) |
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fflush(stderr); |
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#endif |
} |
} |
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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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if ( debug_sfbfctr) |
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fprintf(stderr,"dy=%d\n",dy); |
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for ( k = 1; k <= dy; k++ ) { |
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if ( debug_sfbfctr) |
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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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if ( debug_sfbfctr) |
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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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#if defined(__MINGW32__) || defined(__MINGW64__) |
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fflush(stderr); |
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#endif |
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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 865 void sfbmtop(BM f,V x,V y,P *fp) |
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Line 977 void sfbmtop(BM f,V x,V y,P *fp) |
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if ( DEG(c[j]) >= i && (a = COEF(c[j])[i]) ) { |
if ( DEG(c[j]) >= i && (a = COEF(c[j])[i]) ) { |
NEWDC(dct); |
NEWDC(dct); |
STOQ(j,DEG(dct)); |
STOQ(j,DEG(dct)); |
MKGFS(IFTOF(a),b); |
iftogfs(a,&b); |
COEF(dct) = (P)b; |
COEF(dct) = (P)b; |
NEXT(dct) = dc; |
NEXT(dct) = dc; |
dc = dct; |
dc = dct; |
Line 898 void sfsqfr(P f,DCP *dcp) |
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Line 1010 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(vl,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 1042 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 1086 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 992 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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Line 1102 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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int dx,dy; |
int dx,dy; |
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/* sf(x) = f(x+ev) = list->c[0]*list->c[1]*... */ |
/* sf(x) = f(x+ev) = list->c[0]*list->c[1]*... */ |
sfhensel(5,f,x,degbound,&ev,&sf,&list); |
sfhensel(5,f,x,y,degbound,&ev,&sf,&list); |
if ( list->n == 0 ) |
if ( list->n == 0 ) |
error("sfbfctr : short of evaluation points"); |
error("sfbfctr : short of evaluation points"); |
else if ( list->n == 1 ) { |
else if ( list->n == 1 ) { |
Line 1015 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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Line 1125 void sfbfctr(P f,V x,V y,int degbound,DCP *dcp) |
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*dcp = dc; |
*dcp = dc; |
} |
} |
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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,y,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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} |
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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) */ |
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void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
Line 1087 void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
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Line 1224 void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
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} |
} |
} |
} |
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fprintf(stderr,"np = %d\n",np); |
if ( debug_sfbfctr) |
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fprintf(stderr,"np = %d\n",np); |
dtok = 0; |
dtok = 0; |
for ( g = f, k = 1, dcf = dcf0 = 0, win[0] = 1, --np, z = 0; ; z++ ) { |
for ( g = f, k = 1, dcf = dcf0 = 0, win[0] = 1, --np, z = 0; ; z++ ) { |
if ( !(z % 1000) ) fprintf(stderr,"."); |
if ( debug_sfbfctr && !(z % 1000) ) fprintf(stderr,"."); |
dt = sfdegtest(dy,bound,d1c,k,win); |
dt = sfdegtest(dy,bound,d1c,k,win); |
if ( dt ) |
if ( dt ) |
dtok++; |
dtok++; |
Line 1155 void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
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Line 1293 void sfdtest(P f,ML list,V x,V y,DCP *dcp) |
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for ( i = 0, ++k; i < k; i++ ) |
for ( i = 0, ++k; i < k; i++ ) |
win[i] = i + 1; |
win[i] = i + 1; |
} |
} |
fprintf(stderr,"total %d, omitted by degtest %d\n",z,z-dtok); |
if ( debug_sfbfctr ) |
|
fprintf(stderr,"total %d, omitted by degtest %d\n",z,z-dtok); |
NEXTDC(dcf0,dcf); COEF(dcf) = g; |
NEXTDC(dcf0,dcf); COEF(dcf) = g; |
DEG(dcf) = ONE; NEXT(dcf) = 0; *dcp = dcf0; |
DEG(dcf) = ONE; NEXT(dcf) = 0; *dcp = dcf0; |
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#if defined(__MINGW32__) || defined(__MINGW64__) |
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fflush(stderr); |
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#endif |
} |
} |
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void extractcoefbm(BM f,int dx,UM r) |
void extractcoefbm(BM f,int dx,UM r) |
Line 1322 void cont_pp_sfp(VL vl,P f,P *cp,P *fp) |
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Line 1464 void cont_pp_sfp(VL vl,P f,P *cp,P *fp) |
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y = vl->next->v; |
y = vl->next->v; |
d = getdeg(y,f); |
d = getdeg(y,f); |
if ( d == 0 ) { |
if ( d == 0 ) { |
MKGFS(0,g); |
itogfs(1,&g); |
*cp = (P)g; |
*cp = (P)g; |
*fp = f; /* XXX */ |
*fp = f; /* XXX */ |
} else { |
} else { |