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OpenVMS Hobbyist Program | Integrity Systems Forums | Integrity Software Forum
Author How mouch precise the implementation of OpenVMS for itanium processor?
kzsolt
Member

Posts: 14
Location: Budapest, Hungary
Joined: 08.10.09
Posted on March 14 2011 10:49
smiley How mouch precise the implementation of OpenVMS for itanium processor? I mean the bit field instruction called by C is very critical for our application. And implementing it on intel architecture is not an easy task. Exists some instruction emulation on C lib to do this task?

smiley Othersides anybody know why force HP the OpenVMS to guest of virtual machine instead of real hardware. Maybe the emulated hardware help to handle resources of computer?
Author RE: How mouch precise the implementation of OpenVMS for itanium processor?
imiller
Administrator

User Avatar

Posts: 277
Location: UK
Joined: 24.02.06
Posted on March 16 2011 01:23
I'm not sure what you are asking. The C compiler for OpenVMS I64 works just fine.

OpenVMS can run on real hardware (HP Integrity server, Alphaserver, VAX) or as a guest on HPVM - your choice.
http://www.encompasserve.org/~miller/
Author RE: How mouch precise the implementation of OpenVMS for itanium processor?
kzsolt
Member

Posts: 14
Location: Budapest, Hungary
Joined: 08.10.09
Posted on March 18 2011 03:03
Exchause me, sort explanation:

smiley The bit filed handling is very critical in every platform. Even if the code writed in C the C lib itself use mostly many of assembler "tricks" to handle bitfield. One of the VAX processsor advanatge was the precise bitfield support. If the VMS moved to Intel architecture more problem can occured here because the different processor register and instruction structure.

At practice you can image the file contain 1-32bit wide bitfields in mixed sequence.

smiley So my question was anybody have experience (good or bad) with bitfield on VMS/itanium platform?
Edited by kzsolt on March 18 2011 03:04
Author RE: How mouch precise the implementation of OpenVMS for itanium processor?
abrsvc
Member

Posts: 98
Joined: 12.03.10
Posted on March 18 2011 06:24
There are instruction sequences that are used to implement bit field operations such that the user(you) won't see the difference. What you are really asking is whether or not the same functions are available and the answer is yes. You should be able to take you C program and recompile and run it on the I64 platform without significant change. Without seeing the actual code, I cannot say no changes will be required, but for the most part, the code should work as is.

Dan
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malmberg
June 26 2018
https://www.openvmshobbyi
st.com/forum/viewthread.p
hp?forum_id=10&thread_id=
2363


bhamakripa
June 24 2018
I am trying OpenVMS via SIMH. Need to get OS binaries for v7.3. Registered here but don't have any membership number yet which is needed to get license. Pls suggest what to do. I hardly know anyth

basilh
June 05 2018
Any other forum members in Perth, Australia?

LouF91
April 05 2018
ah maybe they love that!

malmberg
March 24 2018
Probably. More people hang out on the comp.os.vms newsgroup.

vaxpert
March 23 2018
I have a PE42A and other Alpha system stuff for sale. I'm in So California. Any interest out there?

goodbyespy
February 27 2018
To Prohorenko. Please, visit group OpenVMS in the ok.ru

peteherrera
February 24 2018
How much does it cost to buy a complete OpenVMS hardcopy documentation set of the latest version

prohorenko
February 17 2018
Please help to obtain the license on OpenVMS

malmberg
December 12 2017
HPE only makes the most current version of OpenVMS Alpha / IA64 /VAX available to hobbyists. When I had access to the Alliance 1 program it was the same. No public downloads are allowed by HPE.

nmbonao
December 08 2017
Is anybody knows OpenVMS 8.2 version downloadable version? or CD copy? Thank you very much

aarommes
December 02 2017
Bitcoin and Blockchain enthusiasts ( plus distributed computing ) please connec / reply: http://www.openvmshobbyis
t.com/forum/viewthread.ph
p?forum_id=130&thread_id=
2991


malmberg
September 10 2017
https://sourceforge.net/p
/vms-ports/wiki/VMSInstal
lation/ For the most part just use VMS 6.1 media instead of 7.3. But why run the older release?


DoeveR
August 07 2017
Where can I find the write up on running VMS 6.1 using the simh emulator?

Bart
March 20 2017
Happy to have found my password again!

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