FLA_LU_nopiv_blk_var5.c File Reference

(r)


Functions

FLA_Error FLA_LU_nopiv_blk_var5 (FLA_Obj A, fla_lu_t *cntl)

Function Documentation

FLA_Error FLA_LU_nopiv_blk_var5 ( FLA_Obj  A,
fla_lu_t cntl 
)

References FLA_Cont_with_3x3_to_2x2(), FLA_Determine_blocksize(), FLA_Gemm_internal(), FLA_LU_nopiv_internal(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_Obj_width(), FLA_ONE, FLA_Part_2x2(), FLA_Repart_2x2_to_3x3(), and FLA_Trsm_internal().

Referenced by FLA_LU_nopiv_internal().

00036 {
00037   FLA_Obj ATL,   ATR,      A00, A01, A02, 
00038           ABL,   ABR,      A10, A11, A12,
00039                            A20, A21, A22;
00040 
00041   dim_t b;
00042 
00043   FLA_Part_2x2( A,    &ATL, &ATR,
00044                       &ABL, &ABR,     0, 0, FLA_TL );
00045 
00046   while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) &&
00047           FLA_Obj_width( ATL ) < FLA_Obj_width( A )){
00048 
00049     b = FLA_Determine_blocksize( ABR, FLA_BR, FLA_Cntl_blocksize( cntl ) );
00050 
00051     FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00, /**/ &A01, &A02,
00052                         /* ************* */   /* ******************** */
00053                                                 &A10, /**/ &A11, &A12,
00054                            ABL, /**/ ABR,       &A20, /**/ &A21, &A22,
00055                            b, b, FLA_BR );
00056 
00057     /*------------------------------------------------------------*/
00058 
00059     /* A11 = LU( A11 ) */
00060     FLA_LU_nopiv_internal( A11, FLA_Cntl_sub_lu( cntl ) );
00061 
00062     /* A12 = trilu( A11 ) \ A12 */ 
00063     FLA_Trsm_internal( FLA_LEFT, FLA_LOWER_TRIANGULAR, 
00064                        FLA_NO_TRANSPOSE, FLA_UNIT_DIAG,
00065                        FLA_ONE, A11, A12,
00066                        FLA_Cntl_sub_trsm1( cntl ) );
00067 
00068     /* A21 = A21 / triu( A11 ) */ 
00069     FLA_Trsm_internal( FLA_RIGHT, FLA_UPPER_TRIANGULAR, 
00070                        FLA_NO_TRANSPOSE, FLA_NONUNIT_DIAG,
00071                        FLA_ONE, A11, A21,
00072                        FLA_Cntl_sub_trsm2( cntl ) );
00073 
00074     /* A22 = A22 - A21 * A12 */
00075     FLA_Gemm_internal( FLA_NO_TRANSPOSE, FLA_NO_TRANSPOSE,
00076                        FLA_MINUS_ONE, A21, A12, FLA_ONE, A22,
00077                        FLA_Cntl_sub_gemm1( cntl ) );
00078 
00079 
00080     /*------------------------------------------------------------*/
00081 
00082     FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00, A01, /**/ A02,
00083                                                      A10, A11, /**/ A12,
00084                             /* ************** */  /* ****************** */
00085                               &ABL, /**/ &ABR,       A20, A21, /**/ A22,
00086                               FLA_TL );
00087   }
00088 
00089   return FLA_SUCCESS;
00090 }


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