libflame
revision_anchor
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Functions | |
FLA_Error | FLA_Tridiag_UT_l_blf_var3 (FLA_Obj A, FLA_Obj T) |
FLA_Error FLA_Tridiag_UT_l_blf_var3 | ( | FLA_Obj | A, |
FLA_Obj | T | ||
) |
References FLA_Cont_with_1x3_to_1x2(), FLA_Cont_with_3x1_to_2x1(), FLA_Cont_with_3x3_to_2x2(), FLA_Copy_external(), FLA_Her2k_external(), FLA_MINUS_ONE, FLA_Obj_create(), FLA_Obj_datatype(), FLA_Obj_free(), FLA_Obj_length(), FLA_ONE, FLA_Part_1x2(), FLA_Part_2x1(), FLA_Part_2x2(), FLA_Repart_1x2_to_1x3(), FLA_Repart_2x1_to_3x1(), FLA_Repart_2x2_to_3x3(), FLA_Set(), FLA_Triangularize(), FLA_Tridiag_UT_l_step_ofu_var3(), and FLA_ZERO.
Referenced by FLA_Tridiag_UT_l().
{ FLA_Obj ATL, ATR, A00, A01, A02, ABL, ABR, A10, A11, A12, A20, A21, A22; FLA_Obj UT, U0, UB, U1, U2; FLA_Obj ZT, Z0, ZB, Z1, Z2; FLA_Obj TL, TR, T0, T1, T2; FLA_Obj U, Z; FLA_Obj ABR_l; FLA_Obj UB_l, U2_l; FLA_Obj ZB_l, Z2_l; FLA_Obj T1_tl; FLA_Obj none, none2, none3; FLA_Obj UB_tl, UB_bl; FLA_Datatype datatype_A; dim_t m_A; dim_t b_alg, b, bb; b_alg = FLA_Obj_length( T ); datatype_A = FLA_Obj_datatype( A ); m_A = FLA_Obj_length( A ); FLA_Obj_create( datatype_A, m_A, b_alg, 0, 0, &U ); FLA_Obj_create( datatype_A, m_A, b_alg, 0, 0, &Z ); FLA_Part_2x2( A, &ATL, &ATR, &ABL, &ABR, 0, 0, FLA_TL ); FLA_Part_2x1( U, &UT, &UB, 0, FLA_TOP ); FLA_Part_2x1( Z, &ZT, &ZB, 0, FLA_TOP ); FLA_Part_1x2( T, &TL, &TR, 0, FLA_LEFT ); while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) ) { b = min( FLA_Obj_length( ABR ), b_alg ); FLA_Repart_2x2_to_3x3( ATL, /**/ ATR, &A00, /**/ &A01, &A02, /* ************* */ /* ******************** */ &A10, /**/ &A11, &A12, ABL, /**/ ABR, &A20, /**/ &A21, &A22, b, b, FLA_BR ); FLA_Repart_2x1_to_3x1( UT, &U0, /* ** */ /* ** */ &U1, UB, &U2, b, FLA_BOTTOM ); FLA_Repart_2x1_to_3x1( ZT, &Z0, /* ** */ /* ** */ &Z1, ZB, &Z2, b, FLA_BOTTOM ); FLA_Repart_1x2_to_1x3( TL, /**/ TR, &T0, /**/ &T1, &T2, b, FLA_RIGHT ); /*------------------------------------------------------------*/ FLA_Part_2x2( T1, &T1_tl, &none, &none2, &none3, b, b, FLA_TL ); bb = min( FLA_Obj_length( ABR ) - 1, b_alg ); FLA_Part_1x2( ABR, &ABR_l, &none, bb, FLA_LEFT ); FLA_Part_1x2( UB, &UB_l, &none, bb, FLA_LEFT ); FLA_Part_1x2( ZB, &ZB_l, &none, bb, FLA_LEFT ); FLA_Part_2x1( UB_l, &none, &U2_l, b, FLA_TOP ); FLA_Part_2x1( ZB_l, &none, &Z2_l, b, FLA_TOP ); // [ ABR, ZB, T1 ] = FLA_Tridiag_UT_l_step_unb_var3( ABR, ZB, T1, b ); //FLA_Tridiag_UT_l_step_unb_var3( ABR, ZB, T1_tl ); FLA_Tridiag_UT_l_step_ofu_var3( ABR, ZB, T1_tl ); //FLA_Tridiag_UT_l_step_opt_var3( ABR, ZB, T1_tl ); if ( FLA_Obj_length( A22 ) > 0 ) { // Build UB from ABR, with explicit unit subdiagonal and zeros. FLA_Copy_external( ABR_l, UB_l ); FLA_Part_2x1( UB_l, &UB_tl, &UB_bl, 1, FLA_TOP ); FLA_Triangularize( FLA_LOWER_TRIANGULAR, FLA_UNIT_DIAG, UB_bl ); FLA_Set( FLA_ZERO, UB_tl ); // A22 = A22 - U2 * Y2' - Z2 * U2'; FLA_Her2k_external( FLA_LOWER_TRIANGULAR, FLA_NO_TRANSPOSE, FLA_MINUS_ONE, U2_l, Z2_l, FLA_ONE, A22 ); } /*------------------------------------------------------------*/ FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR, A00, A01, /**/ A02, A10, A11, /**/ A12, /* ************** */ /* ****************** */ &ABL, /**/ &ABR, A20, A21, /**/ A22, FLA_TL ); FLA_Cont_with_3x1_to_2x1( &UT, U0, U1, /* ** */ /* ** */ &UB, U2, FLA_TOP ); FLA_Cont_with_3x1_to_2x1( &ZT, Z0, Z1, /* ** */ /* ** */ &ZB, Z2, FLA_TOP ); FLA_Cont_with_1x3_to_1x2( &TL, /**/ &TR, T0, T1, /**/ T2, FLA_LEFT ); } FLA_Obj_free( &U ); FLA_Obj_free( &Z ); return FLA_SUCCESS; }