Xinu7/man/man1/subEIS.doc

SUBEIS(1)           Xinu Programmer's Manual            SUBEIS(1)



NAME
     subEIS - substitute code for LSI 11 extended instructions

SYNOPSIS
     subASH
     subASHC
     subMUL
     subDIV

DESCRIPTION
     These programs read an LSI 11 assembly language program from
     the standard input, replace opcodes from the  Extended
     Instruction Set (EIS) with a call to a library subroutine
     that simulates them, and write the new listing on the stan-
     dard output.  They are used mainly as filters for compiling
     LSI 11/02 programs for machines without the EIS chip.

     Each program checks for a different instruction; _s_u_b_M_U_L
     checks for (and replaces) _m_u_l instructions, _s_u_b_D_I_V checks
     for (and replaces) _d_i_v instructions, _s_u_b_A_S_H checks for (and
     replaces) _a_s_h instructions, and _s_u_b_A_S_H_C checks for (and
     replaces) _a_s_h_c instructions.  The resulting assembly
     language program must be loaded with the library _l_i_b_e_i_s._a ,
     which contains the routines called.

SEE ALSO
     cc11(1), EIS(2)

DIAGNOSTICS
     The condition codes are correctly set by the above calling
     sequence.

BUGS
     Setting the condition codes accounts for most of the work
     these routines perform.  Unfortunately, they are so slow
     that most programs, including Xinu are unusable on an 11/2
     without the EIS hardware.


















Version 6b               Printed 1/12/87                        1