Whenever partial decoupling is discovered, its degree is calcu-

lated using CALCDC. If the degree is greater than the previously

encountered maximum degree of decoupling the new scheme is considered

to be better. The old scheme is released using RELNAM and the new

scheme is saved. Whenever a decoupling scheme is released, CLRMEM is

called to clear the MEMORY COMMON area of the unneeded data.

 A decoupling scheme is saved by making the output assignments to

the SIM and the indices and saving these with STOSIM and STONDX.

 The subprogram terminates either by finding full decoupling or

by analyzing all possible combinations of index incrementing (at which

point a "best" partial decoupling scheme will have been found).

B.1.3 I21QSA

STOSIM (3.2), JILGND (4.4), J1LGOR (4.5), JiVIDM (5.7), HASSAL (6.5),

SPEDUP (6.20)

 The first step by I2I SA is to create the IDM's for each variable

index by calling J1VIDM and then to store these IDM's using STOSIM.

The IDM names are stored in the vector IDMPV as indicated in Chapter 5.

The output set assignments for the IDM's are made by I2ISA. If only

structural consideration of the IDM's is to be made, the subprogram

J1LGND is called to produce the logical "AND" IDM for each function

index. This is analyzed by HASSAL to determine whether an output set

assignment can be made. If it can,then that output set assignment can

be used for all of the IDM's of the function index. JILGOR is called

to produce the logical "OR" IDM's. Then HASSAL and SPEDUP determine

whether any of these fully precedence order. If any does, its

corresponding function index fully precedence orders. The output set