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z80: optimize chkPS

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Inline it in next and make chkPS, call a newly reserved label for
it directly, removing a layer of indirection. This frees a spot in
the stable ABI.
This commit is contained in:
Virgil Dupras 2020-06-14 09:48:10 -04:00
parent 31095bc04d
commit 40f92b9bab
7 changed files with 30 additions and 46 deletions
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2
blk/243
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@ -5,7 +5,7 @@
: JPNEXT, 26 BJP, ; ( 26 == next ) : JPNEXT, 26 BJP, ; ( 26 == next )
: chkPS, 29 BCALL, ; ( 29 == chkPS ) : chkPS, L4 @ BCALL, ; ( chkPS, B305 )
: CODE ( same as CREATE, but with native word ) : CODE ( same as CREATE, but with native word )
(entry) (entry)

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blk/283
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@ -5,7 +5,7 @@ NOP, ( 0a, unused ) 0 JPnn, ( 0b, cellWord )
0 JPnn, ( 0e, compiledWord ) 0 JPnn, ( 11, pushRS ) 0 JPnn, ( 0e, compiledWord ) 0 JPnn, ( 11, pushRS )
0 JPnn, ( 14, popRS ) 0 JPnn, ( 14, popRS )
EXDEHL, JP(HL), NOP, ( 17, nativeWord ) EXDEHL, JP(HL), NOP, ( 17, nativeWord )
0 JPnn, ( 1a, next ) 0 JPnn, ( 1d, chkPS ) 0 JPnn, ( 1a, next ) 0 JPnn, ( unused )
NOP, NOP, ( 20, numberWord ) NOP, NOP, ( 22, litWord ) NOP, NOP, ( 20, numberWord ) NOP, NOP, ( 22, litWord )
NOP, NOP, ( 24, addrWord ) NOP, NOP, ( 26, unused ) NOP, NOP, ( 24, addrWord ) NOP, NOP, ( 26, unused )
0 JPnn, ( RST 28 ) 0 JPnn, ( RST 28 )

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@ -1,16 +0,0 @@
L1 BSET PC ORG @ 0x1e + ! ( chkPS )
( Note that you only need to call this in words that push
back to PSP. If they don't, calling chkPS is redundant with
check in next )
EXX,
( We have the return address for this very call on the stack
and protected registers. 2 - is to compensate that. )
HL PS_ADDR 2 - LDddnn,
SP SUBHLss,
EXX,
CNC RETcc, ( PS_ADDR >= SP? good )
JR, L2 BWR ( abortUnderflow-B298 )

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blk/300
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@ -3,14 +3,14 @@ PC ORG @ 0x1b + ! ( next )
we jump to current IP, but we also take care of increasing we jump to current IP, but we also take care of increasing
it by 2 before jumping. ) it by 2 before jumping. )
( Before we continue: are stacks within bounds? ) ( Before we continue: are stacks within bounds? )
L1 @ ( chkPS ) BCALL, ( PS ) HL PS_ADDR LDddnn,
( check RS ) SP SUBHLss,
IX PUSHqq, HL POPqq, JRC, L2 BWR ( abortUnderflow-B298 )
( RS ) IX PUSHqq, HL POPqq,
DE RS_ADDR LDddnn, DE RS_ADDR LDddnn,
DE SUBHLss, DE SUBHLss,
JRC, L2 BWR ( IX < RS_ADDR? abortUnderflow-B298 ) JRC, L2 BWR ( IX < RS_ADDR? abortUnderflow-B298 )
E 0 IY+ LDrIXY, E 0 IY+ LDrIXY,
D 1 IY+ LDrIXY, D 1 IY+ LDrIXY,
IY INCss, IY INCss, IY INCss,
IY INCss,
( continue to execute ) ( continue to execute )

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@ -1,15 +1,15 @@
( Core words ) L4 BSET ( chkPS )
( KEY and EMIT are not defined here. There're ( Note that you only need to call this in words that push
expected to be defined in platform-specific code. ) back to PSP. If they don't, calling chkPS is redundant with
check in next )
EXX,
CODE EXECUTE ( We have the return address for this very call on the stack
DE POPqq, and protected registers. 2 - is to compensate that. )
chkPS, HL PS_ADDR 2 - LDddnn,
JR, L3 BWR ( execute-B301 ) SP SUBHLss,
EXX,
CNC RETcc, ( PS_ADDR >= SP? good )
JR, L2 BWR ( abortUnderflow-B298 )

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blk/306
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@ -1,16 +1,16 @@
( Core words )
( KEY and EMIT are not defined here. There're
expected to be defined in platform-specific code. )
CODE EXECUTE
DE POPqq,
chkPS,
JR, L3 BWR ( execute-B301 )
( a b c -- b c a ) ( a b c -- b c a )
CODE ROT CODE ROT
HL POPqq, ( C ) HL POPqq, ( C ) DE POPqq, ( B ) BC POPqq, ( A )
DE POPqq, ( B )
BC POPqq, ( A )
chkPS, chkPS,
DE PUSHqq, ( B ) DE PUSHqq, ( B ) HL PUSHqq, ( C ) BC PUSHqq, ( A )
HL PUSHqq, ( C )
BC PUSHqq, ( A )
;CODE ;CODE

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