FLA_Trsm_llt_unb_var1.c File Reference

(r)

Functions
FLA_Error	FLA_Trsm_llt_unb_var1 (FLA_Diag diagA, FLA_Obj alpha, FLA_Obj A, FLA_Obj B)

Function Documentation

FLA_Trsm_llt_unb_var1()

FLA_Error FLA_Trsm_llt_unb_var1	(	FLA_Diag	diagA,
		FLA_Obj	alpha,
		FLA_Obj	A,
		FLA_Obj	B
	)

{
  FLA_Obj ATL,   ATR,      A00,  a01,     A02, 
          ABL,   ABR,      a10t, alpha11, a12t,
                           A20,  a21,     A22;
 
  FLA_Obj BT,              B0,
          BB,              b1t,
                           B2;
 
  FLA_Scal_external( alpha, B );
 
  FLA_Part_2x2( A,    &ATL, &ATR,
                      &ABL, &ABR,     0, 0, FLA_BR );
 
  FLA_Part_2x1( B,    &BT, 
                      &BB,            0, FLA_BOTTOM );
 
  while ( FLA_Obj_length( ABR ) < FLA_Obj_length( A ) ){
 
    FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00,  &a01,     /**/ &A02,
                                                &a10t, &alpha11, /**/ &a12t,
                        /* ************* */   /* ************************** */
                           ABL, /**/ ABR,       &A20,  &a21,     /**/ &A22,
                           1, 1, FLA_TL );
 
    FLA_Repart_2x1_to_3x1( BT,                &B0, 
                                              &b1t, 
                        /* ** */            /* *** */
                           BB,                &B2,        1, FLA_TOP );
 
    /*------------------------------------------------------------*/
 
    /* b1t = b1t - a21' * B2; */
    FLA_Gemv_external( FLA_TRANSPOSE, FLA_MINUS_ONE, B2, a21, FLA_ONE, b1t );
 
    /* b1t = b1t / alpha11; */
    if ( diagA != FLA_UNIT_DIAG )
      FLA_Inv_scal_external( alpha11, b1t );
 
    /*------------------------------------------------------------*/
 
    FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00,  /**/ a01,     A02,
                            /* ************** */  /* ************************ */
                                                     a10t, /**/ alpha11, a12t,
                              &ABL, /**/ &ABR,       A20,  /**/ a21,     A22,
                              FLA_BR );
 
    FLA_Cont_with_3x1_to_2x1( &BT,                B0, 
                            /* ** */           /* *** */
                                                  b1t, 
                              &BB,                B2,     FLA_BOTTOM );
 
  }
 
  return FLA_SUCCESS;
}

References FLA_Cont_with_3x1_to_2x1(), FLA_Cont_with_3x3_to_2x2(), FLA_Gemv_external(), FLA_Inv_scal_external(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_ONE, FLA_Part_2x1(), FLA_Part_2x2(), FLA_Repart_2x1_to_3x1(), FLA_Repart_2x2_to_3x3(), FLA_Scal_external(), and i.

Referenced by FLA_Trsm_llt().