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                           BEWARE FILE FOR

                             BLISS-10 V7E





                             Revision:  0

                          Date:  April 1978






















COPYRIGHT (C) 1976,1977 BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.


THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND  COPIED
ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH  LICENSE AND WITH THE
INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR  ANY  OTHER
COPIES  THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE  IS  HEREBY
TRANSFERRED.

THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITHOUT  NOTICE
AND  SHOULD  NOT  BE  CONSTRUED  AS  A COMMITMENT BY DIGITAL EQUIPMENT
CORPORATION.

DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF  ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
BEWARE FILE FOR BLISS-10 V7E                                    Page 2












                          TABLE OF CONTENTS


     This file contains the following information:


     1.0  Licensing provisions


     2.0  General Information


     3.0  List of files included in BLISS-10 V7E


     4.0  Installation instructions


     5.0  Recommended patches and known deficiencies


     6.0  General warnings


     7.0  New features, differences observable to the
          user and operator


     8.0  Results of testing
BEWARE FILE FOR BLISS-10 V7E                                    Page 3


1.0  LICENSING PROVISIONS


The software described herein  including,  but  not  limited  to,  the
functions,   program   portions  and  program  modifications  are  the
proprietary  information  of  Digital  Equipment  Corporation.    This
software  is  furnished  only  to  licensed  customers  for  use  on a
designated DECSYSTEM-20 computer system.

Digital hereby places recipient on notice that the software  described
herein  is governed by the license agreement executed by recipient for
the operating system.

Permitting this software to be copied for any use other than for usage
on  the designated DECSYSTEM-20 computer system is a serious violation
of the licensing agreement.  Unauthorized use of this  software  could
have serious legal consequences.



2.0  GENERAL INFORMATION


Version V7E of the BLISS-10 compiler is a maintenance release in  that
it  contains  many  patches  to  fix known bugs.  It also contains new
functionality which could affect some current  programs.   BLIS10  V7E
will  build  field-image  APL  (version  1A)  and  field-image FORTRAN
(version 5A) with edit 623  installed.   BLIS10  V7E  will  not  build
field-image BASIC-PLUS-2/20 (version 1A) or its associated RMS.  These
products suffer from the functional modifications outlined in  section
6.0   below.   This  document  contains  information  on  installation
procedures and known bugs and deficiencies.



3.0  LIST OF FILES INCLUDED IN BLISS-10 7E


See BLIS20.LOG for a complete list of all of the files included in the
version V7E release of the BLISS-10 package.



4.0  INSTALLATION INSTRUCTIONS


Install  BLIS10.EXE,  BLIS10.ERR  and  SIX12.REL  on  <SUBSYS>.    Put
BLIS10.HLP on HLP:  and BLIS10.DOC on DOC:.
BEWARE FILE FOR BLISS-10 V7E                                    Page 4


5.0  RECOMMENDED PATCHES AND KNOWN DEFICIENCIES


See BLS7E.DOC for a list of known bugs and deficiencies.


Appended to this .BWR file is FORTRAN PCO  #271  which  is  edit  623.
This  edit  must be installed in FORTRAN V5A before it can be built by
BLIS10 V7E.



6.0  GENERAL WARNINGS


The control file BLIS20.CTL which builds  BLISS-10  creates  the  .DOC
file  for  BLIS10  under  the  name  BLIS10.DOC.   That file is on the
release tape as BLS7E.DOC.


The .REL files for the BLISS-10 compiler produced  by  BLIS10  7B(222)
have  a  creation  date  in  1966.  This is caused by a DATE75 problem
between  the  DECsystem-10  BLISS-10  compiler  and  the  DECSYSTEM-20
compatibility  package.   The contents of these .REL files are correct
and have been tested.


Two modifications to the way BLIS10  parses  MACRO  definitions  could
adversely affect existing programs:

     1.  As outlined in BLS7E.DOC, a macro whose  last  lexeme  begins
         with a ? must not end with the $ which ends the macro.

             MACRO A = ?..X$;

         must be written as

             MACRO A = ?..X $;

     2.  A macro formal in a lexeme beginning  with  $,  will  not  be
         recognized so concatenation will not be performed.

         Example:

             MACRO A(X) = ?..X $;
             A(N);

         will expand into "?..X", not "?..N".

         To circumvent this, define

             MACRO IDENT (B) = B $;
             MACRO A(X) = IDENT(?..)X $;
BEWARE FILE FOR BLISS-10 V7E                                    Page 5


7.0  NEW FEATURES, DIFFERENCES OBSERVABLE TO THE USER


The new features and enhancements  in  version  V7E  of  the  BLISS-10
compiler are documented in BLS7E.DOC.



8.0  RESULTS OF TESTING


BLIS10 V7E has been tested in-house at our Marlboro facility, used  to
build  our BLISS-based products and exercised by in-house BLISS users.
All that we guarentee  is  that  BLIS10  V7E  will  build  field-image
FORTRAN V5A (with edit 623) and field-image APL V1A.



[End of BLS7E.BWR]
Digital Equipment Corporation       14-MAR-78    Page   1
PCO Log Report



                   *********************
                   *PCO #:10-F10   -271*
                   *********************


[Program Data]          System:   F10
                        Component:F10

[Validity]         5(515), TESTED IN 5A(622)

[Date Entered]          10-OCT-77

[Programmer]            STAN WHITLOCK

[Routines]              MOVA      QUALIF

[Key Words]             LOOPING     BLIS10      >7B(222)

[Source Before Edit]    %5A  (000622)

[Source After Edit]     %5A  (000623)

[Test File Data]            :           [        ]

[Miscellaneous]         DOC changes:   N
                        SER/SPR Number:10-NONE
                        Critical:      N


************************************************************************

[Notes]
Digital Equipment Corporation       14-MAR-78    Page   2
PCO Log Report

[PCO Write-up]



                        **********


[SYMPTOM]
 
 
 
 
The compiler loops in FORTD in ONLIST looking at a doubly nested implied
DO  used  to  READ a double subscripted array.  This ONLY happens with a
compiler built with a BLIS10 NEWER than 7B(222).
 

                        **********


[DIAGNOSIS]
 
ONLIST is called by QUALIFY to see if a  variable  is  on  the  DOCHNGL.
Unfortunately  there  is  no  extended  optimizer block and therefore no
DOCHNGL to search in the DO node of an implied  DO.   The  SRCOPT  field
which  would  point  to  the  optimizer  block  is 0.  It seems that the
register allocation  in  all  BLIS10s  from  7B(222)  BACK  generates  a
sequence  of  instructions that calls ONLIST with a zero list pointer so
that it exits immediately.  BLIS10 7C(224) generates different  register
usage  and  passes  ONLIST garbage which it dutifully chases infinitely.
This occurs during statement optimizations (in LABLAD)  and  not  global
optimizations so the IMPLDO flag is not set.
 

                        **********


[CURE]
 
Modify QUALIFY to call ONLIST (searching the DOCHNGL) only if SRCOPT  is
non-zero which means that we are NOT in an iolist.
 
Digital Equipment Corporation       14-MAR-78    Page   3
PCO Log Report


[FILCOM]
File 1)	LIB:COMMAN.MAC[31,4650]	created: 1400 07-OCT-1977
File 2)	DSKC:COMMAN.MAC[31,4577]	created: 1121 10-OCT-1977
 
1)1	TITLE	FTNCMD	%5B(622) COMMAND SCANNER INTERFACE FOR FORTRAN C
	OMPILER
1)	SUBTTL	DONALD LEWINE/DAL/FI/HPW/DBT/NEA/MD/JNT/DCE/SJW/JNG 7-OC
	T-77
1)	;COPYRIGHT (C) 1972,1977 BY
****
2)1	TITLE	FTNCMD	%5B(623) COMMAND SCANNER INTERFACE FOR FORTRAN C
	OMPILER
2)	SUBTTL	DONALD LEWINE/DAL/FI/HPW/DBT/NEA/MD/JNT/DCE/SJW/JNG 10-O
	CT-77
2)	;COPYRIGHT (C) 1972,1977 BY
**************
1)	;END REVISION HISTORY
****
2)	;623	MOVA(27)	-----	FIX QUALIFY TO CALL ONLIST ONLY
	IF THE
2)	;				  DOCHNGL EXISTS (IE, WE'RE NOT
	IN AN
2)	;				  IOLIST: THIS IS NECESSARY TO U
	SE A
2)	;				  BLIS10 NEWER THAN 7B(222)
2)	;END REVISION HISTORY
**************
1)	EDNUM==622	;EDIT NUMBER
1)	JOBVER=137
****
2)	EDNUM==623	;EDIT NUMBER
2)	JOBVER=137
**************
 
Digital Equipment Corporation       14-MAR-78    Page   4
PCO Log Report


[FILCOM]
File 1)	FTN:MOVA.BLI[31,4735]	created: 1734 04-OCT-1977
File 2)	DSKC:MOVA.BLI[31,4577]	created: 1102 10-OCT-1977
 
1)1	GLOBAL BIND MOVAV= 5^24 + 0^18 + 26;	!VERSION DATE: 22-SEP-76
1)		%(
****
2)1	GLOBAL BIND MOVAV= 5^24 + 2^18 + 27;	!VERSION DATE: 10-OCT-77
2)		%(
**************
1)1		)%
****
2)1	**********	BEGIN VERSION 5B	**********
2)	27	623	-----	FIX QUALIFY TO CALL ONLIST ONLY IF THE D
	OCHNGL
2)				  EXISTS (IE, WE'RE NOT IN AN IOLIST):
	THIS IS
2)				  NECESSARY TO USE A BLIS10 NEWER THAN 7
	B(222)
2)		)%
**************
1)1			NOT ONLIST(.TOP[DOCHNGL],.TREEPTR[ARG1PTR])
1)			AND
****
2)1	!**[623] QUALIFY @3642  SJW  10-OCT-77
2)	%[623]%		(IF .TOP [SRCOPT] EQL 0		! NO OPT BLOCK I
	F IN
2)	%[623]%		  THEN 1			!   AN IOLIST (I
	MPLIED DO)
2)	%[623]%		  ELSE NOT ONLIST (.TOP [DOCHNGL],.TREEPTR [ARG1
	PTR]))
2)			AND
**************
1)1			NOT ONLIST(.TOP[DOCHNGL], .TREEPTR[ARG2PTR])
1)			AND
****
2)1	!**[623] QUALIFY @3652  SJW  10-OCT-77
2)	%[623]%		(IF .TOP [SRCOPT] EQL 0		! NO OPT BLOCK I
	F IN
2)	%[623]%		  THEN 1			!   AN IOLIST (I
	MPLIED DO)
2)	%[623]%		  ELSE NOT ONLIST (.TOP [DOCHNGL],.TREEPTR [ARG2
	PTR]))
2)			AND
**************

[End PCO Write-up]