FLA_Trsv_lt_blk_var2.c File Reference

(r)


Functions

FLA_Error FLA_Trsv_lt_blk_var2 (FLA_Diag diagA, FLA_Obj A, FLA_Obj x, fla_trsv_t *cntl)

Function Documentation

FLA_Error FLA_Trsv_lt_blk_var2 ( FLA_Diag  diagA,
FLA_Obj  A,
FLA_Obj  x,
fla_trsv_t cntl 
)

References FLA_Cont_with_3x1_to_2x1(), FLA_Cont_with_3x3_to_2x2(), FLA_Determine_blocksize(), FLA_Gemv_internal(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_ONE, FLA_Part_2x1(), FLA_Part_2x2(), FLA_Repart_2x1_to_3x1(), FLA_Repart_2x2_to_3x3(), and FLA_Trsv_internal().

Referenced by FLA_Trsv_lt().

00036 {
00037   FLA_Obj ATL,   ATR,      A00, A01, A02, 
00038           ABL,   ABR,      A10, A11, A12,
00039                            A20, A21, A22;
00040 
00041   FLA_Obj xT,              x0,
00042           xB,              x1,
00043                            x2;
00044 
00045   dim_t b;
00046 
00047   FLA_Part_2x2( A,    &ATL, &ATR,
00048                       &ABL, &ABR,     0, 0, FLA_BR );
00049 
00050   FLA_Part_2x1( x,    &xT, 
00051                       &xB,            0, FLA_BOTTOM );
00052 
00053   while ( FLA_Obj_length( ABR ) < FLA_Obj_length( A ) ){
00054 
00055     b = FLA_Determine_blocksize( ATL, FLA_TL, FLA_Cntl_blocksize( cntl ) );
00056 
00057     FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00, &A01, /**/ &A02,
00058                                                 &A10, &A11, /**/ &A12,
00059                         /* ************* */   /* ******************** */
00060                            ABL, /**/ ABR,       &A20, &A21, /**/ &A22,
00061                            b, b, FLA_TL );
00062 
00063     FLA_Repart_2x1_to_3x1( xT,                &x0, 
00064                                               &x1, 
00065                         /* ** */            /* ** */
00066                            xB,                &x2,        b, FLA_TOP );
00067 
00068     /*------------------------------------------------------------*/
00069 
00070     /* x1 = tril( A11' ) \ x1; */
00071     FLA_Trsv_internal( FLA_LOWER_TRIANGULAR, FLA_TRANSPOSE, diagA,
00072                        A11, x1,
00073                        FLA_Cntl_sub_trsv( cntl ) );
00074 
00075     /* x0 = x0 - A10' * x1; */
00076     FLA_Gemv_internal( FLA_TRANSPOSE,
00077                        FLA_MINUS_ONE, A10, x1, FLA_ONE, x0,
00078                        FLA_Cntl_sub_gemv( cntl ) );
00079 
00080     /*------------------------------------------------------------*/
00081 
00082     FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00, /**/ A01, A02,
00083                             /* ************** */  /* ****************** */
00084                                                      A10, /**/ A11, A12,
00085                               &ABL, /**/ &ABR,       A20, /**/ A21, A22,
00086                               FLA_BR );
00087 
00088     FLA_Cont_with_3x1_to_2x1( &xT,                x0, 
00089                             /* ** */           /* ** */
00090                                                   x1, 
00091                               &xB,                x2,     FLA_BOTTOM );
00092 
00093   }
00094 
00095   return FLA_SUCCESS;
00096 }


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