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Old 24 April 2015, 06:07   #47
matthey
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Join Date: Jan 2010
Location: Kansas
Posts: 1,284
Quote:
Originally Posted by JimDrew View Post
With Mac emulation on the 060 you need superscaler off, and most often need the instruction cache as well (depending on the application). A 33MHz 040 beats a 50MHz 060 in Mac benchmarks.
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.

Quote:
Originally Posted by JimDrew View Post
What makes you think shifting of any width is "slow" on an FPGA?
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.
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