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| Thoughts about a high-density ISA http://anycpu.org/forum/viewtopic.php?f=3&t=819 |
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| Author: | robinsonb5 [ Sun Apr 17, 2022 8:38 am ] |
| Post subject: | Re: Thoughts about a high-density ISA |
NorthWay wrote: I don't really have any suitable compressed data to test it with, but I think it should be equivalent. EDIT: No, that was a buggy attempt. Halted at 70. There's a little chunk of (headerless) compressed data here: https://github.com/robinsonb5/EightThir ... 4/Firmware If it uncompresses to a brief message then some Lorem Ipsum text... Shaving off even a further two bytes is still pretty cool! |
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| Author: | robfinch [ Sun Apr 17, 2022 12:45 pm ] |
| Post subject: | Re: Thoughts about a high-density ISA |
That 68k code is pretty impressive. 174 bytes. I found a LZ4 decompression routine for RISCV and ported it to Thor. It turned out to be 174 bytes in size, but I blew 16 bytes saving and restoring the registers that were used. Still the 68k code was much more compact. I wonder if that is generally the case for a wide variety of apps. I have not tested it yet. |
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| Author: | NorthWay [ Sun Feb 26, 2023 7:09 am ] |
| Post subject: | Re: Thoughts about a high-density ISA |
robfinch wrote: That 68k code is pretty impressive. ...and sometimes you win the staring competition with the abyss. I haven't gotten as far as testing it yet, but after waving my fist at it for most of Saturday I am pretty confident I got it down to 66 bytes. That is still with a 2-byte penalty for the format being small-endian and a 4-byte penalty for not using 68020+. Optimizing for size can be detrimental to optimizing for speed; with more common code executed you can be sure to have known (beneficial) states. |
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