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EDIT: Implemented faster version of memmove() in ascending direction

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Bobbi Webber-Manners 2020-08-26 18:53:27 -04:00
parent f106655d0f
commit 5d772344c7
1 changed files with 23 additions and 20 deletions
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43
apps/edit.c
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@ -198,7 +198,7 @@ ds3:
__asm__("sta $c073"); // Set aux bank back to 0
#endif
} else {
// Start with highest addr and copy upwards
// Start with lowest addr and copy upwards
*(uint16_t*)(0xfa) = n; // Stuff sz in ZP
*(uint16_t*)(0xfc) = (uint16_t)0x0800 + src; // Stuff src in ZP
*(uint16_t*)(0xfe) = (uint16_t)0x0800 + dst; // Stuff dst in ZP
@ -208,29 +208,32 @@ ds3:
__asm__("sta $c005"); // Write aux mem
__asm__("sta $c003"); // Read aux mem
#endif
__asm__("ldx #$00");
al1:
__asm__("lda ($fc)"); // *src
__asm__("sta ($fe)"); // -> *dst
__asm__("cpx $fb"); // MSB of n
__asm__("beq %g", as1); // No more complete 256 byte blocks
__asm__("inc $fc"); // LSB of src
__asm__("bne %g", as1);
__asm__("inc $fd"); // MSB of src
__asm__("ldy #$00"); // Copy one block of 256 bytes
al2:
__asm__("lda ($fc),y");
__asm__("sta ($fe),y");
__asm__("iny");
__asm__("bne %g", al2);
__asm__("inc $fd"); // MSB of source
__asm__("inc $ff"); // MSB of dest
__asm__("inx");
__asm__("jmp %g", al1);
as1:
__asm__("inc $fe"); // LSB of dst
__asm__("bne %g", as2);
__asm__("inc $ff"); // MSB of dst
__asm__("ldy #$00"); // Copy leftover bytes
al3:
__asm__("cpy $fa"); // LSB of n
__asm__("beq %g", as2); // Done!
__asm__("lda ($fc),y");
__asm__("sta ($fe),y");
__asm__("iny");
__asm__("jmp %g", al3);
as2:
__asm__("lda $fa"); // LSB of n
__asm__("bne %g", as3);
__asm__("dec $fb"); // MSB of n
as3:
__asm__("dec $fa"); // LSB of n
__asm__("bne %g", al1); // Loop
__asm__("lda $fb"); // MSB of n
__asm__("bne %g", al1); // Loop
#ifdef AUXMEM
__asm__("sta $c002"); // Read main mem
__asm__("sta $c004"); // Write main mem