153 SUBROUTINE zlavsy( UPLO, TRANS, DIAG, N, NRHS, A, LDA, IPIV, B,
162 CHARACTER diag, trans, uplo
163 INTEGER info, lda, ldb, n, nrhs
167 COMPLEX*16 a( lda, * ),
b( ldb, * )
174 parameter( cone = ( 1.0d+0, 0.0d+0 ) )
179 COMPLEX*16 d11, d12, d21, d22, t1, t2
196 IF( .NOT.
lsame( uplo,
'U' ) .AND. .NOT.
lsame( uplo,
'L' ) )
THEN
198 ELSE IF( .NOT.
lsame( trans,
'N' ) .AND. .NOT.
lsame( trans,
'T' ) )
201 ELSE IF( .NOT.
lsame( diag,
'U' ) .AND. .NOT.
lsame( diag,
'N' ) )
204 ELSE IF( n.LT.0 )
THEN
206 ELSE IF( lda.LT.max( 1, n ) )
THEN
208 ELSE IF( ldb.LT.max( 1, n ) )
THEN
212 CALL
xerbla(
'ZLAVSY ', -info )
221 nounit =
lsame( diag,
'N' )
227 IF(
lsame( trans,
'N' ) )
THEN
232 IF(
lsame( uplo,
'U' ) )
THEN
240 IF( ipiv( k ).GT.0 )
THEN
247 $ CALL
zscal( nrhs, a( k, k ),
b( k, 1 ), ldb )
255 CALL
zgeru( k-1, nrhs, cone, a( 1, k ), 1,
b( k, 1 ),
256 $ ldb,
b( 1, 1 ), ldb )
262 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
279 b( k,
j ) = d11*t1 + d12*t2
280 b( k+1,
j ) = d21*t1 + d22*t2
290 CALL
zgeru( k-1, nrhs, cone, a( 1, k ), 1,
b( k, 1 ),
291 $ ldb,
b( 1, 1 ), ldb )
292 CALL
zgeru( k-1, nrhs, cone, a( 1, k+1 ), 1,
293 $
b( k+1, 1 ), ldb,
b( 1, 1 ), ldb )
297 kp = abs( ipiv( k ) )
299 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
321 IF( ipiv( k ).GT.0 )
THEN
328 $ CALL
zscal( nrhs, a( k, k ),
b( k, 1 ), ldb )
337 CALL
zgeru( n-k, nrhs, cone, a( k+1, k ), 1,
338 $
b( k, 1 ), ldb,
b( k+1, 1 ), ldb )
344 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
362 b( k-1,
j ) = d11*t1 + d12*t2
363 b( k,
j ) = d21*t1 + d22*t2
373 CALL
zgeru( n-k, nrhs, cone, a( k+1, k ), 1,
374 $
b( k, 1 ), ldb,
b( k+1, 1 ), ldb )
375 CALL
zgeru( n-k, nrhs, cone, a( k+1, k-1 ), 1,
376 $
b( k-1, 1 ), ldb,
b( k+1, 1 ), ldb )
381 kp = abs( ipiv( k ) )
383 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
395 ELSE IF(
lsame( trans,
'T' ) )
THEN
401 IF(
lsame( uplo,
'U' ) )
THEN
412 IF( ipiv( k ).GT.0 )
THEN
419 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
423 CALL
zgemv(
'Transpose', k-1, nrhs, cone,
b, ldb,
424 $ a( 1, k ), 1, cone,
b( k, 1 ), ldb )
427 $ CALL
zscal( nrhs, a( k, k ),
b( k, 1 ), ldb )
437 kp = abs( ipiv( k ) )
439 $ CALL
zswap( nrhs,
b( k-1, 1 ), ldb,
b( kp, 1 ),
444 CALL
zgemv(
'Transpose', k-2, nrhs, cone,
b, ldb,
445 $ a( 1, k ), 1, cone,
b( k, 1 ), ldb )
446 CALL
zgemv(
'Transpose', k-2, nrhs, cone,
b, ldb,
447 $ a( 1, k-1 ), 1, cone,
b( k-1, 1 ), ldb )
460 b( k-1,
j ) = d11*t1 + d12*t2
461 b( k,
j ) = d21*t1 + d22*t2
484 IF( ipiv( k ).GT.0 )
THEN
491 $ CALL
zswap( nrhs,
b( k, 1 ), ldb,
b( kp, 1 ), ldb )
495 CALL
zgemv(
'Transpose', n-k, nrhs, cone,
b( k+1, 1 ),
496 $ ldb, a( k+1, k ), 1, cone,
b( k, 1 ), ldb )
499 $ CALL
zscal( nrhs, a( k, k ),
b( k, 1 ), ldb )
509 kp = abs( ipiv( k ) )
511 $ CALL
zswap( nrhs,
b( k+1, 1 ), ldb,
b( kp, 1 ),
516 CALL
zgemv(
'Transpose', n-k-1, nrhs, cone,
517 $
b( k+2, 1 ), ldb, a( k+2, k+1 ), 1, cone,
519 CALL
zgemv(
'Transpose', n-k-1, nrhs, cone,
520 $
b( k+2, 1 ), ldb, a( k+2, k ), 1, cone,
534 b( k,
j ) = d11*t1 + d12*t2
535 b( k+1,
j ) = d21*t1 + d22*t2