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boot: inline chkRS, make next a bit faster

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This commit is contained in:
Virgil Dupras 2020-04-20 20:28:25 -04:00
parent bf49ca2ed2
commit 353d12c27d
2 changed files with 6 additions and 11 deletions
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emul/forth/z80c.bin
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forth/boot.fs
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@ -6,9 +6,8 @@ H@ 256 /MOD 2 PC! 2 PC!
At all times, IX points to RSP TOS and IY is IP. SP points
to PSP TOS, but you can still use the stack in native code.
you just have to make sure you've restored it before "next".
)
( STABLE ABI
STABLE ABI
Those jumps below are supposed to stay at these offsets,
always. If they change bootstrap binaries have to be
adjusted because they rely on them. Those entries are
@ -265,21 +264,17 @@ PC ORG @ 0x1e + ! ( chkPS )
CNC RETcc, ( INITIAL_SP >= SP? good )
JR, L1 BWR ( abortUnderflow )
L2 BSET ( chkRS )
IX PUSHqq, HL POPqq,
DE RS_ADDR LDddnn,
DE SUBHLss,
CNC RETcc, ( IX >= RS_ADDR? good )
JR, L1 BWR ( abortUnderflow )
PC ORG @ 0x1b + ! ( next )
( This routine is jumped to at the end of every word. In it,
we jump to current IP, but we also take care of increasing
it by 2 before jumping. )
( Before we continue: are stacks within bounds? )
0x1d CALLnn, ( chkPS )
L2 @ CALLnn, ( chkRS )
( check RS )
IX PUSHqq, HL POPqq,
DE RS_ADDR LDddnn,
DE SUBHLss,
JRC, L1 BWR ( IX < RS_ADDR? abortUnderflow )
E 0 IY+ LDrIXY,
D 1 IY+ LDrIXY,
IY INCss,