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collapseos
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Mirror of CollapseOS
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collapseos/blk/297

297 284B
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z80: inline lblfind's routine into _find word
il y a 4 ans
z80: move boot code around Bring native words together, make the next/exec/does/compiled cluster be at the beginning. Next step: bring find code into _find word.
il y a 4 ans
z80: Use BC as IP register instead of IY It's a bit more inconvenient in terms of register protection (BC is much more generally useful than IY), but it makes tight spots such as next and execute much faster, so I think it's worth it.
il y a 4 ans
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z80: move boot code around Bring native words together, make the next/exec/does/compiled cluster be at the beginning. Next step: bring find code into _find word.
il y a 4 ans
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Make br cells 1 byte wide The 1 byte limitation has been effective for a while now, but I hadn't made the move yet, I wanted to see if the limitation would cause me problems. It doesn't. Doing this now slightly facilitates the IY->BC move in z80. Bootstrapping: if you try to recreate the CVM binary from the previous commit with this code, you'll have bootstrapping problems. The first bootstrap will compile a binary with 2-bytes wide cells but branching conditionals that yields 1-byte cells. That's bad. I got around the issue by temporarily inserting a "397 399 LOADR" instruction in cvm/xcomp.fs, right before the xcomp overrides. This way, I force 1-byte cells everywhere on the first compiliation, which then allows me to apply the logic change in cvm/vm.c and have a properly running binary.
il y a 4 ans
z80: Use BC as IP register instead of IY It's a bit more inconvenient in terms of register protection (BC is much more generally useful than IY), but it makes tight spots such as next and execute much faster, so I think it's worth it.
il y a 4 ans
z80: move boot code around Bring native words together, make the next/exec/does/compiled cluster be at the beginning. Next step: bring find code into _find word.
il y a 4 ans
 12345678910111213 
  1. CODE (br)

  2. L1 BSET ( used in ?br and loop )

  3.     LDA(BC), H 0 LDri, L A LDrr,

  4.     RLA, IFC, H DECr, THEN,

  5.     BC ADDHLd, B H LDrr, C L LDrr,

  6. ;CODE

  7. CODE (?br)

  8.     HL POP,

  9.     HLZ,

  10.     JRZ, L1 BWR ( br + 1. False, branch )

  11.     ( True, skip next byte and don't branch )

  12.     BC INCd,

  13. ;CODE