[Libre-soc-isa] [Bug 933] prefix-code (like huffman code) decode/encode instructions

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Sep 23 10:06:34 BST 2022


https://bugs.libre-soc.org/show_bug.cgi?id=933

--- Comment #14 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
+    | PO    |  RT  |   RA  |   RB  | RC    | XO |once|

please keep to short names, i have told you this many times.

+56,ALU,OP_PCDEC,RA,RB,RC,RT,NONE,CR0,0
+        elif regs == ['RA', 'RB', 'RC', 'RT', '', 'CR0']:  # pcdec

you cannot use the same bit for Rc as for the immediate.

you also cannot use a different-width XO in the same Form
so a different Form will be needed.

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