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- Path: nntp.teleport.com!sschaem
- From: sschaem@teleport.com (Stephan Schaem)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: Processors
- Date: 18 Mar 1996 19:07:33 GMT
- Organization: Teleport - Portland's Public Access (503) 220-1016
- Message-ID: <4ikc9l$t08@nadine.teleport.com>
- References: <1880.6651T550T1538@darwin.topend.com.au>
- NNTP-Posting-Host: linda.teleport.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- travis (envision@darwin.topend.com.au) wrote:
- : 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.
-
- When imagine is compiled for the 040 with a good C compiler then it
- would be just to compare a warp 040 40mhz amiga with a 40mhz i80486.
-
- What where the system compared anyway?
-
- Stephan
-