samuel-devulder / ugbasic Goto Github PK

We shall collect info about temporaries during peephole analysis:

• name
• size of temporary
• number of time it is read
• number of time it is written
• flag indicated if it was inlined
• flag indicating it is moved to direct page

Inline temporaries inside code

When peephole first finds CMPX _Ttmp<num> add _Ttmp<num> equ *-2 right after so that _Ttmp<num> is now inlined in the code. We must check that the temporary is 2bytes, and remove its previous definition

This makes code:

• shorter
• faster
• auto-modifiable, but this isn't an issue for mc6809.

Remove declaration of Unread temporaries

This reduces memory footprint

Move temporaries to direct page

Sort collected temporaries by nums of Read+Write, and if enough room remains in direct page (how to know this?), move top used temporaries in there. Then in code replace all extended access by direct page access. This reduces the memory footprint and makes the code run faster.

This is caused by a line in the ASM being longer than MAX_TEMPORARY_STORAGE.

This is caused by a line in the ASM being longer than MAX_TEMPORARY_STORAGE.