Vax 613 0S Instruction Manual download pdf (Page 53)

USER

GROUP

NEWS

Issue 3 - Vol 2

PRODUCT

PERFORivlANCE

PRODUCT

PERFORMANCE

SECTION

SOFTWARE

ERRATA

SHEET

MDP will begin shipping

"Errata

Sheets" with new versions of software products.

The

Errata

Sheet will be

updated

when

additional

problems/workarounds

are found. The

Errata

sheets will be shipped with

the

product

and will

published

User Group News.

Here

the first

Errata

Sheet:

8560

Pascal

Compiler

for

the

68000/68010

(PAS68K

opt

lA)

Version

Several problems

with

the 68000 Version 2 release were noted. These were

judged

be problems which can be

easily avoided.

The

first problem involves use of

the

$stackch

$list

compiler options in

the

middle of a program, which

may

cause

the

optimizer

report

internal errors. We recommend

that

the

$stackck

option

be used once

the

begin-

ning

the

source

file

for the time being. No problems are observed when

optimization

is suppressed.

The second problem involves

the

$tagck

compiler option.

may generate unnecessary register stores.

the

$stackck

option

set (as by default),

the

call

the

ENTRYQQ

routine

the

beginning of the main program (or possibly, a procedure).

This

will cause the negative addresses

be referenced

the case of

the

main program.

The

problem occurs infrequently

and

may

made

harmless by inserting

$stackck-

directive

the beginning of

the

source file.

also possible

that"

with"

statements

will cause

the

same register stores. Once again,

the

$stackck-

directive will ensure

that

the

stores

can only be gener3.tcd

after

the

activation

record

set

up by the LINK instruction.

the

number

nested"

with"

statements

exceeds

the

available registers, erroneous code

may

generated.

This

should not

happen

unless

the"

with"

statements

are nested more

than

five deep.

Our

test

had

15.

As in the Version 1 release, type checking does

not

distinguish "value" versus

"var"

parameters

procedural

parameters.

December

1983

TEKTRONIX

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