FLA_Trinv_l_blk_var4.c File Reference

(r)


Functions

FLA_Error FLA_Trinv_l_blk_var4 (FLA_Diag diag, FLA_Obj A, fla_trinv_t *cntl)

Function Documentation

FLA_Error FLA_Trinv_l_blk_var4 ( FLA_Diag  diag,
FLA_Obj  A,
fla_trinv_t cntl 
)

References FLA_Cont_with_3x3_to_2x2(), FLA_Determine_blocksize(), FLA_Gemm_internal(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_ONE, FLA_Part_2x2(), FLA_Repart_2x2_to_3x3(), FLA_Trinv_internal(), FLA_Trmm_internal(), and FLA_Trsm_internal().

Referenced by FLA_Trinv_l().

00038 {
00039   FLA_Obj ATL,   ATR,      A00, A01, A02, 
00040           ABL,   ABR,      A10, A11, A12,
00041                            A20, A21, A22;
00042 
00043   dim_t b;
00044 
00045   FLA_Part_2x2( A,    &ATL, &ATR,
00046                       &ABL, &ABR,     0, 0, FLA_TL );
00047 
00048   while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) ){
00049 
00050     b = FLA_Determine_blocksize( ABR, FLA_BR, FLA_Cntl_blocksize( cntl ) );
00051 
00052     FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00, /**/ &A01, &A02,
00053                         /* ************* */   /* ******************** */
00054                                                 &A10, /**/ &A11, &A12,
00055                            ABL, /**/ ABR,       &A20, /**/ &A21, &A22,
00056                            b, b, FLA_BR );
00057 
00058     /*------------------------------------------------------------*/
00059 
00060     /* A21 = -triu( A22 ) \ A21 */
00061     FLA_Trsm_internal( FLA_LEFT, FLA_LOWER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 
00062                        FLA_MINUS_ONE, A22, A21, 
00063                        FLA_Cntl_sub_trsm1( cntl ) );
00064 
00065     /* A20 = -A21 * A10 + A20 */
00066     FLA_Gemm_internal( FLA_NO_TRANSPOSE, FLA_NO_TRANSPOSE,
00067                        FLA_MINUS_ONE, A21, A10, FLA_ONE, A20, 
00068                        FLA_Cntl_sub_gemm( cntl ) );
00069 
00070     /* A10 = A10 * A00 */
00071     FLA_Trmm_internal( FLA_RIGHT, FLA_LOWER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 
00072                        FLA_ONE, A00, A10, 
00073                        FLA_Cntl_sub_trmm( cntl ) );
00074 
00075     /* A11 = inv( A11 ) */
00076     FLA_Trinv_internal( FLA_LOWER_TRIANGULAR, diag, A11,
00077                         FLA_Cntl_sub_trinv( cntl ) );
00078 
00079     /*------------------------------------------------------------*/
00080 
00081     FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00, A01, /**/ A02,
00082                                                      A10, A11, /**/ A12,
00083                             /* ************** */  /* ****************** */
00084                               &ABL, /**/ &ABR,       A20, A21, /**/ A22,
00085                               FLA_TL );
00086 
00087   }
00088 
00089   return FLA_SUCCESS;
00090 }


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