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NAME
     dlauum - compute the product U * U' or L'  *  L,  where  the
     triangular  factor  U  or  L is stored in the upper or lower
     triangular part of the array A

SYNOPSIS
     SUBROUTINE DLAUUM( UPLO, N, A, LDA, INFO )

     CHARACTER UPLO

     INTEGER INFO, LDA, N

     DOUBLE PRECISION A( LDA, * )



     #include <sunperf.h>

     void dlauum(char uplo, int  n,  double  *da,  int  lda,  int
               *info) ;

PURPOSE
     DLAUUM computes the product U * U' or L' * L, where the tri-
     angular  factor  U or L is stored in the upper or lower tri-
     angular part of the array A.

     If UPLO = 'U' or 'u' then the upper triangle of  the  result
     is stored, overwriting the factor U in A.
     If UPLO = 'L' or 'l' then the lower triangle of  the  result
     is stored, overwriting the factor L in A.

     This is the blocked form of the algorithm, calling  Level  3
     BLAS.


ARGUMENTS
     UPLO      (input) CHARACTER*1
               Specifies whether the triangular factor stored  in
               the array A is upper or lower triangular:
               = 'U':  Upper triangular
               = 'L':  Lower triangular

     N         (input) INTEGER
               The order of the triangular factor U or L.   N  >=
               0.

     A         (input/output) DOUBLE PRECISION  array,  dimension
               (LDA,N)
               On entry, the triangular factor U or L.  On  exit,
               if  UPLO  =  'U',  the  upper  triangle  of  A  is
               overwritten with the upper triangle of the product
               U  * U'; if UPLO = 'L', the lower triangle of A is
               overwritten with the lower triangle of the product
               L' * L.

     LDA       (input) INTEGER
               The leading dimension of  the  array  A.   LDA  >=
               max(1,N).

     INFO      (output) INTEGER
               = 0: successful exit
               < 0: if INFO = -k, the k-th argument had an  ille-
               gal value

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