collapseos/blk/297

CODE (br)
L1 BSET ( used in ?br and loop )
PC ORG @ 0x3d + ! ( stable ABI JP )
    LDA(BC), H 0 LDri, L A LDrr,
    RLA, IFC, H DECr, THEN,
    BC ADDHLd, B H LDrr, C L LDrr,
;CODE
CODE (?br)
PC ORG @ 0x41 + ! ( stable ABI JP )
    HL POP,
    HLZ,
    JRZ, L1 BWR ( br + 1. False, branch )
    ( True, skip next byte and don't branch )
    BC INCd,
;CODE
z80: inline lblfind's routine into _find word 2020-07-05 22:35:54 -04:00			`CODE (br)`
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. 2020-07-05 22:23:40 -04:00			`L1 BSET ( used in ?br and loop )`
			`PC ORG @ 0x3d + ! ( stable ABI JP )`
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. 2020-07-06 23:31:00 -04:00			`LDA(BC), H 0 LDri, L A LDrr,`
			`RLA, IFC, H DECr, THEN,`
			`BC ADDHLd, B H LDrr, C L LDrr,`
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. 2020-07-05 22:23:40 -04:00			`;CODE`
			`CODE (?br)`
			`PC ORG @ 0x41 + ! ( stable ABI JP )`
			`HL POP,`
			`HLZ,`
			`JRZ, L1 BWR ( br + 1. False, branch )`
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. 2020-07-06 07:27:50 -04:00			`( True, skip next byte and don't branch )`
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. 2020-07-06 23:31:00 -04:00			`BC INCd,`
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. 2020-07-05 22:23:40 -04:00			`;CODE`