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collapseos/blk/285

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Make DO..LOOP stable DO and LOOP now only compile words from stable ABI, which make them suitable for xcomp. This will greatly simplify driver writing and allow us to mostly avoid the low/high divide in drivers. LEAVE is still xcomp-incompatible though. This make us very very tight for "<0x100" limit for literal words. Hopefully, we won't need more stuff in that area of the binary...
2020-05-13 00:37:24 +10:00
CODE (?br) ( 0x67 )
HL POPqq, chkPS,
HLZ,
JRZ, L2 BWR ( BR + 2. False, branch )
L1 BSET ( loop will jump here )
( True, skip next 2 bytes and don't branch )
IY INCss, IY INCss,
Copy boot.z80 to blkfs
2020-04-23 11:19:12 +10:00
JPNEXT,
Make DO..LOOP stable DO and LOOP now only compile words from stable ABI, which make them suitable for xcomp. This will greatly simplify driver writing and allow us to mostly avoid the low/high divide in drivers. LEAVE is still xcomp-incompatible though. This make us very very tight for "<0x100" limit for literal words. Hopefully, we won't need more stuff in that area of the binary...
2020-05-13 00:37:24 +10:00
CODE (loop) ( 0x77 )
0 IX+ INC(IXY+), IFZ, 1 IX+ INC(IXY+), THEN, ( I++ )
( Jump if I <> I' )
A 0 IX+ LDrIXY, 2 IX- CP(IXY+), JRNZ, L2 BWR ( branch )
A 1 IX+ LDrIXY, 1 IX- CP(IXY+), JRNZ, L2 BWR ( branch )
( don't branch )
IX DECss, IX DECss, IX DECss, IX DECss, JR, L1 BWR