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File No. S360-25(OS)
Form Y28-6642-3
Program Logic
IBM System/360 Operating System
FORTRAN IV (H) Compiler
Program Logic Manual
Program Number 360S-FO-500
This publication describes the internal design of
the IBM System/360 Operating System FORTRAN IV (H) com-
piler program, which transforms source modules written
in the FORTRAN IV language into object modules that are
suitable for input to the linkage editor for subsequent
execution on System/360. At the user's option, the
compiler produces optimized object modules (modules
that can be executed with improved efficiency).
This program logic manual is directed to the IBM
customer engineer who is responsible for program main-
tenance. It can be used to locate specific areas of
the program and it enables the reader to relate these
areas to the corresponding program listings. Because
program logic information is not necessary for program
operation and use, distribution of this manual is
restricted to persons with program-maintenance
responsibilities.
This revision reflects Version II of the FORTRAN IV
(H) compiler program. A number of table formats and
intermediate text formats have been changed. The over-
all operation of the compiler has not changed signifi-
cantly, but some routines within the program have been
changed, new routines have been added, and some rou-
tines have been deleted or combined with other
routines.
Restricted Distribution
Fourth Edition (November 1 968 )
This publication corresponds to Release 17. It is a major revision of,
and makes obsolete, Form Y28-6642-2. The description about the process-
ing of BACKSPACE statements, which appears in "Appendix E: Object-Time
Library Subprograms," has been changed to reflect the improvements made
in the FORTRAN object-time library. In addition, miscellaneous clarifi-
cations and corrections have been made throughout the publication. New
or modified material is indicated by a vertical line in the left-hand
margin. The symbol