View unanswered posts | View active topics It is currently Thu Mar 28, 2024 10:36 am



Reply to topic  [ 4 posts ] 
 video - comparing four modern 64 bit CISC architectures 
Author Message

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1780
.
50 min talk by Camiel Vanderhoeven from 2017

Quote:
An introduction to the X86-64 Architecture, and a comparison of this architecture with the VAX, Alpha, and Itanium architectures that OpenVMS currently runs on. Delivered at the OpenVMS Boot Camp 2017 in Westford, MA.


Comparing Architectures: VAX, Alpha, Itanium and X86-64 (OpenVMS Boot Camp 2017)

Can't find the slide deck (yet)


Mon Jan 07, 2019 3:31 pm
Profile

Joined: Thu Mar 08, 2018 10:24 am
Posts: 13
It sounds like that the VAX men don't like the ARM, MIPS, and x86.


Last edited by litwr on Sun Mar 10, 2019 9:50 am, edited 1 time in total.



Wed Jan 23, 2019 12:20 pm
Profile

Joined: Wed Jan 02, 2019 4:10 pm
Posts: 14
Well, there's a lot to not like about x86, especially if you're used to the VAX - or, for that matter, pretty much *any* sane ISA.

A dislike of ARM and MIPS, however, can only be put down to a bias against RISC. "What, you have to issue separate instructions to load a pre-and-post-indexed-double-indirect memory operand before you can calculate the cube root of it? I should be able to do that all in one instruction!"


Sat Feb 09, 2019 7:05 pm
Profile

Joined: Thu Mar 08, 2018 10:24 am
Posts: 13
Chromatix wrote:
Well, there's a lot to not like about x86, especially if you're used to the VAX - or, for that matter, pretty much *any* sane ISA.

A dislike of ARM and MIPS, however, can only be put down to a bias against RISC. "What, you have to issue separate instructions to load a pre-and-post-indexed-double-indirect memory operand before you can calculate the cube root of it? I should be able to do that all in one instruction!"


IMHO the sanity of ISA is rather a matter of taste. I have some VAX programming experience. IMHO it was like a ride on a dinosaur. The x86 ISA, on the contrary, has always been one of the best for its time. IMHO only the ARM-32 ISA could compete with it. It can not fail to impress much that the 8086 designed in a way that considers importance of atomic operations or simultaneous instruction execution. The latter was missed by the 68k and VAX ISA which set flags after almost every executed instruction. I was also impressed that the theoretically slower 8086 or even 8088 can outperform the large 68000 when they execute byte manipulation code.


Sun Mar 10, 2019 10:11 am
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: AhrefsBot, SemrushBot and 13 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software