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#include "tools.h"
void CpcatrmvUT(UNIT, N, alpha, A, IA, JA, descA, X, IX, JX, descX, incX, beta,
Y, IY, JY, descY, incY)
int UNIT;
int N;
float alpha;
float *A;
int IA;
int JA;
int *descA;
float *X;
int IX;
int JX;
int *descX;
int incX;
float beta;
float *Y;
int IY;
int JY;
int *descY;
int incY;
/*
*
* ======(Yr)======
*
* N
* ---------------
* | |\_ | A - N x N
* | | \_ | Y - N x 1
* | | \_ (A) | X - 1 x N
* (Xc) N | \_ |
* | | \_ | X will be replicated on every
* | | \_ | process column
* | | \ | Y will have space on every
* | | \_| process row
* ---------------
*/
{
/*
* .. External routines ..
*/
char *ptop();
void pberror_();
void Cinfog2l();
int Cnumroc2();
void Cblacs_gridinfo();
void Csgebs2d();
void Csgebr2d();
void Csgsum2d();
F_INTG_FCT sgemv_();
void Cpcsvabs1();
void Cpsscal1();
void Cpscopy1();
void Cpsaxpy1();
F_CHAR trans;
char *top;
int Ir, Jr, Ic, Jc, i, j, k, kb, nb, lld, LOCp, LOCq, one=1, I=0;
int ctxt, nprow, npcol, myrow, mycol, arow, acol, currow, curcol;
int descX1[DLEN_], descXc[DLEN_], descYr[DLEN_], IX1, JX1, incX1;
float *a, *aa, *ac, *absA, *X1, *Xc, *Yr, *xc, *yr, *yr2, zero=0.0;
trans = C2F_CHAR("T");
ctxt = descA[CTXT_];
Cblacs_gridinfo(descA[CTXT_], &nprow, &npcol, &myrow, &mycol);
/*
* Scale Y by beta: Y = beta * Y; this allows us to later add in
* alpha*A*x to get Y = alpha*A*x + Y*beta
*/
Cpsscal1(N, beta, Y, IY, JY, descY, incY);
/*
* Collapse complex X down to real X1
*/
Cpcsvabs1(N, X, IX, JX, descX, incX, &X1, &IX1, &JX1, descX1, &incX1);
/*
* Get local information about our matrix
*/
Cinfog2l(IA, JA, descA, nprow, npcol, myrow, mycol, &i, &j, &arow, &acol);
ac = &A[ 2*(i+j*descA[LLD_]) ];
nb = descA[NB_];
lld = descA[LLD_];
LOCp = Cnumroc2(N, IA, nb, myrow, descA[RSRC_], nprow);
LOCq = Cnumroc2(N, JA, nb, mycol, descA[CSRC_], npcol);
/*
* Set up Xc, Yr, and absA
*/
Ir = Jc = 0;
Ic = IA % nb;
Jr = JA % nb;
i = Ic + LOCp;
j = Jr + LOCq;
Mmalloc(Yr, float, i+j+nb*LOCp, kb, ctxt);
Xc = &Yr[j];
absA = &Xc[i];
Mdescset(descXc, N+Ic, 1, nb, nb, arow,
MCindxg2p(JX, descX[NB_], descX[CSRC_], npcol), ctxt, MAX(1,i));
Mdescset(descYr, 1, N+Jr, nb, nb,
MCindxg2p(IY, descY[MB_], descY[RSRC_], nprow), acol, ctxt, 1);
if (myrow == arow) xc = &Xc[Ic];
else xc = Xc;
if (mycol == acol) yr2 = yr = &Yr[Jr];
else yr2 = yr = Yr;
/*
* Copy X and broadcast it to all process columns
*/
Cpscopy1(N, X1, IX1, JX1, descX1, incX1, Xc, Ic, Jc, descXc, one);
free(X1);
top = ptop("B", "R", "!");
if (mycol == descXc[CSRC_]) Csgebs2d(ctxt, "r", top, LOCp, 1, xc, LOCp);
else Csgebr2d(ctxt, "r", top, LOCp, 1, xc, LOCp, myrow, descXc[CSRC_]);
kb = nb - Ic;
kb = MIN(kb, N);
currow = arow;
curcol = acol;
LOCp = 0;
do
{
if (mycol == curcol)
{
aa = absA;
a = ac;
if (myrow == currow) /* I have diagonal block */
{
for (j=0; j != kb; j++)
{
k = LOCp + j;
for (i=0; i != k; i++) aa[i] = ABS( a[2*i] ) + ABS( a[2*i+1] );
if (UNIT) aa[i] = 1.0;
else aa[i] = ABS( a[2*i] ) + ABS( a[2*i+1] );
k = LOCp + kb;
for (i++; i < k; i++) aa[i] = 0.0;
a += 2*lld;
aa += k;
}
LOCp += kb;
sgemv_(trans, &LOCp, &kb, &alpha, absA, &LOCp, xc, &one, &zero,
yr, &one);
}
else if (LOCp)
{
for (j=kb; j; j--)
{
for (i=0; i != LOCp; i++) aa[i] = ABS( a[2*i] ) + ABS( a[2*i+1] );
aa += LOCp;
a += 2*lld;
}
sgemv_(trans, &LOCp, &kb, &alpha, absA, &LOCp, xc, &one, &zero,
yr, &one);
}
else for (i=0; i != kb; i++) yr[i] = 0.0;
ac += 2*kb*lld;
yr += kb;
}
else if (myrow == currow) LOCp += kb;
I += kb;
kb = MIN(nb, N-I);
if (++currow == nprow) currow=0;
if (++curcol == npcol) curcol=0;
}
while (I != N);
/*
* Collect distributed Y
*/
if (LOCq)
{
top = ptop("C", "C", "!");
Csgsum2d(ctxt, "col", top, LOCq, 1, yr2, LOCq, descYr[RSRC_], mycol);
}
/*
* Set y = A*x + beta*y (Y has beta*y, and Yr has A*x)
*/
Cpsaxpy1(N, 1.0, Yr, Ir, Jr, descYr, one, Y, IY, JY, descY, incY);
if (Yr) free(Yr);
}
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