home *** CD-ROM | disk | FTP | other *** search
- Path: darwin.topend.com.au!usenet
- From: envision@darwin.topend.com.au (travis)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Processors
- Date: 17 Mar 1996 23:45:41 GMT
- Organization: topend.com.au Internet Access In The NT
- Message-ID: <1880.6651T550T1538@darwin.topend.com.au>
- NNTP-Posting-Host: envision.topend.com.au
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
- Greetings,
-
- I looking for non emotional comments :-) about the differences between
- Motorola processors and Intel equivs.
-
- Recently, In the Imagine mailing list, we have been discussing the the very
- obvious performance difference between Amiga Imagine and PC Imagine.
- Comparing similar clock speeds, the PC version of Imagine does run much faster
- than the Amiga version.
-
- According to MSIP, the Amiga OS is allowing Imagine at least 94% of CPU time
- so that would indicate to me that the OS is a low overhead consideration.
-
- I know that Amiga Imagine is compiled for 68020+FPU code and PC Imagine
- compiled for 386+FPU code.
-
- Could it be that the difference in performance is due to the fact that when
- the 040 was released, some of the original FPU functions must now be emulated?
-
- Have the Intel processors maintained the same FPU instructions right through
- the various CPU versions? This might then explain the sometimes large
- differences we are seeing.
-
- I know that when Imagine textures are compiled for 040 only use they are some
- 20- 30% faster than the equivalent 68020+FPU code at the same clock rate.
-
- Considering the differnce between 68020+FPU and the 040's FPU should a program
- like Imagine be compiled for 040 (or 060) only use? I guess one would have to
- know which FPU instructions Imagine was using though.
-
- Well I don't want to start a CPU war here, I'm just looking for sensible
- comment.
-
- Travis.
-
- --
- _________________________________________________________________________
- _____ ___ __________________ _ __
- / __/ |/ / | / / _/ __/ _/ __ \/ |/ / For Television, Video & Print
- / _// /| |/ // /_\ \_/ // /_/ / /
- /___/_/|_/ |___/___/___/___/\____/_/|_/
- / _ _ _ _ |_ . _ _ envision@darwin.topend.com.au
- \__)| (_||_)| )|(__)
- ---------------------------|---------------------------------------------
-
-