From: groepaz (groepaz_at_gmx.net)
Date: 2002-05-21 14:12:04
Hello Mark,
Tuesday, May 21, 2002, 2:00:54 PM, you wrote:
KM> Hi Christian,
>> Now, where I managed to build a little test project for the
>> Lynx under cc65, I like to ask if there is a feature
>> which allows to place static variables into zero page
>> for quicker access?
>>
>> The special (old) Lynx-Adaption of cc65 has the keyword 'zstatic'
>> for this feature. Is there something like that to achieve the
>> same behaviour under cc65 2.8?
KM> After a little experiment I think there maybe a bug here
KM> but that'll need to be confirmed as I'm not sure how
KM> this should work. I tried my test.c file:
KM> #pragma rodataseg ("zp")
KM> char *msg = "Hello.";
KM> #pragma rodataseg ("RODATA")
KM> main(int c,char**v) {
KM> exit(printf("%s\n",msg));
KM> }
KM> Compiled using "cl65 -S test.c" gave this in the asm produced:
KM> <snip>
KM> .segment "DATA"
KM> _msg:
KM> .addr L0001+0
KM> .segment "RODATA"
KM> .segment "zp"
KM> .segment "RODATA"
KM> L0001:
KM> .byte $C8,$45,$4C,$4C,$4F,$2E,$00,$25,$53,$0D,$00
KM> </snip>
KM> Shouldn't the last bit be this:
KM> .segment "zp"
KM> L0001:
KM> .byte $C8,$45,$4C,$4C,$4F,$2E,$00
KM> .segment "RODATA"
KM> L0002:
KM> .byte $25,$53,$0D,$00
KM> Thoughts?
nmmmh i _think_ the only way to put variables into zeropage is by
using the "register" keyword.
--
Best regards,
groepaz mailto:groepaz_at_gmx.net
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