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Old 24 April 2015, 23:12   #51
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Join Date: Dec 2013
Location: Lake Havasu City, AZ
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Originally Posted by matthey View Post
I found the video with the 68060@106MHz.

[ Show youtube player ]

Do you think a 68040 can give this performance? The Mac benchmarks show the 68060@106MHz to outperform the 68040 and even early PPC processors.
LOL! Yeah, FUSION with a 33MHz 040 has way faster benchmarks than that - especially the FPU tests. We wrote complete Pack 4 and Pack 5 replacements, so the Mac FPU speed was 2-5 times faster than the real equiv. speed Mac.

This is why Hollywood production studios used EMPLANT equipped Amigas to replace their Macs for doing rendering and using Avid video editing software.

Originally Posted by matthey View Post
Most FPGAs have multipliers which can be used for shifts but a 64 bit or even 53 bit shift is too wide for this. Larger shifts are not a problem but take more logic and several cycles. Even the 6888x could do a significand (fraction) shift in 1 cycle. Most FPU operations require the shift as part of the normalization process.
I am not an FPGA guru, but the solution for having to use multiple cycles (if that is really necessary) is using a faster base clock for you logic.
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