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#include "tools.h"
void CpsagemvA(M, N, alpha, A, IA, JA, descA, X0, IX0, JX0, descX0, incX0,
beta0, Y0, IY0, JY0, descY0, incY0)
int M;
int N;
float alpha;
float *A;
int IA;
int JA;
int *descA;
float *X0;
int IX0;
int JX0;
int *descX0;
int incX0;
float beta0;
float *Y0;
int IY0;
int JY0;
int *descY0;
int incY0;
/*
* ======(X)======
* N
* ---------------
* || | | A - M x N
* || | | Y - M x 1
* || | | X - 1 x N
* (Y) | (A) | M
* || | | X will be replicated across all rows
* || | | Y will have space on all columns
* || | |
* || | |
* ---------------
*/
{
/*
* .. External routines ..
*/
char *ptop();
void pchkmat();
void pchkvec();
void pberror_();
void Cinfog2l();
int Cnumroc2();
void Cblacs_gridinfo();
void Csgebs2d();
void Csgebr2d();
void Csgsum2d();
F_INTG_FCT sgemv_();
void Cpsscal1();
void Cpscopy1();
void Cpsaxpy1();
char *top;
F_CHAR trans;
int ctxt, nprow, npcol, myrow, mycol;
int IX, JX, descX[DLEN_], incX, IY, JY, descY[DLEN_], incY;
int i, j, k, h, arow, acol, LOCp, LOCq, nb, info=0, one=1;
float *absX, *Y, *absA, *x, *y, *y0, *a, *aa, beta=0.0;
trans = C2F_CHAR("n");
ctxt = descA[CTXT_];
Cblacs_gridinfo(ctxt, &nprow, &npcol, &myrow, &mycol);
pchkmat(M, 2, N, 3, IA+1, JA+1, descA, 8, &info, nprow, npcol, myrow, mycol);
pchkvec(N, 3, IX0+1, JX0+1, descX0, incX0, 12, &info, nprow, npcol,
myrow, mycol);
pchkvec(M, 2, IY0+1, JY0+1, descY0, incY0, 18, &info, nprow, npcol,
myrow, mycol);
if (descA[CTXT_] != descX0[CTXT_])
{
if (info == 0) info = -(1200+CTXT_+1);
}
else if (descX0[CTXT_] != descY0[CTXT_])
{
if (info == 0) info = -(1800+CTXT_+1);
}
if (info)
{
pberror_(&ctxt, "PSAGEMV", &info);
return;
}
/*
* Quick return, if possible
*/
if ( (M == 0) || (N == 0) || ((alpha == 0.0) && (beta0 == 1.0)) ) return;
/*
* Scale Y0 by beta: Y0 = beta * Y0; this allows us to later add in
* alpha*A*x to get Y0 = alpha*A*x + Y0*beta
*/
Cpsscal1(M, beta0, Y0, IY0, JY0, descY0, incY0);
/*
* Get local information about our matrix
*/
Cinfog2l(IA, JA, descA, nprow, npcol, myrow, mycol, &i, &j, &arow, &acol);
a = &A[ i+j*descA[LLD_] ];
nb = descA[NB_];
LOCp = Cnumroc2(M, IA, descA[MB_], myrow, descA[RSRC_], nprow);
LOCq = Cnumroc2(N, JA, nb, mycol, descA[CSRC_], npcol);
/*
* Allocate space for absX, Y, and absA
*/
i = JA % nb + LOCq;
j = IA % descA[MB_] + LOCp;
Mmalloc(absX, float, i+j+nb*LOCp, h, ctxt);
Y = &absX[i];
absA = &Y[j];
/*
* Set up absX, a row vector aligned with A, copy abs( X ) to it,
* and give all process rows a copy
*/
IX = 0;
JX = JA % nb;
Mdescset(descX, 1, N + JX, 1, nb,
MCindxg2p(IX0, descX0[MB_], descX0[RSRC_], nprow), acol, ctxt, 1);
incX = 1;
Cpscopy1(N, X0, IX0, JX0, descX0, incX0, absX, IX, JX, descX, incX);
/*
* Set local pointer into absX
*/
if (mycol == descX[CSRC_]) x = &absX[JX];
else x = absX;
top = ptop("B", "C", "!");
if (myrow == descX[RSRC_])
{
for (i=0; i != LOCq; i++) x[i] = ABS( x[i] );
Csgebs2d(ctxt, "c", top, LOCq, 1, x, LOCq);
}
else Csgebr2d(ctxt, "c", top, LOCq, 1, x, LOCq, descX[RSRC_], mycol);
/*
* Set up Y, a column vector aligned with A
*/
IY = IA % descA[MB_];
JY = 0;
Mdescset(descY, M + IY, 1, descA[MB_], 1, arow,
MCindxg2p(JY0, descY0[NB_], descY0[CSRC_], npcol), ctxt, LOCp+IY+1);
incY = 1;
/*
* Set local pointer into Y
*/
if (myrow == descY[RSRC_]) y = &Y[IY];
else y = Y;
/*
* Figure local portion of abs matrix vector product by looping over NB wide panels
*/
if (LOCp != 0)
{
if (LOCq != 0)
{
j = 0;
do
{
aa = absA;
h = MIN(nb, LOCq-j);
for (k=0; k != h; k++) /* set absA = abs( sub(A) ) */
{
for(i=0; i != LOCp; i++) aa[i] = ABS( a[i] );
a += descA[LLD_];
aa += LOCp;
}
sgemv_(trans, &LOCp, &h, &alpha, absA, &LOCp, &x[j], &one, &beta,
y, &one);
j += nb;
beta = 1.0;
}
while(j < LOCq);
}
else for (i=0; i != LOCp; i++) y[i] = 0.0;
/*
* Figure global answer
*/
top = ptop("C", "R", "!");
Csgsum2d(ctxt, "row", top, LOCp, 1, y, descY[LLD_], myrow, descY[CSRC_]);
}
/*
* Y contains ALPHA*A*x. Y0 contains BETA*y. Use psaxpy to set
* Y0 = ALPHA*A*x + BETA*y
*/
Cpsaxpy1(M, 1.0, Y, IY, JY, descY, incY, Y0, IY0, JY0, descY0, incY0);
if (absX) free(absX);
}
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