diff options
| -rw-r--r-- | console.s | 27 | ||||
| -rw-r--r-- | taipan.c | 31 |
2 files changed, 49 insertions, 9 deletions
@@ -138,7 +138,32 @@ _rvs_off: ; ...or 5 bytes each. we have 5 of them, so 25 bytes. using fall-thru ; and the BIT trick, they condense down to 17 bytes. ; if you're not familiar with the "BIT trick" to skip a 2-byte instruction, - ; the stuff below looks like gibberish, sorry. + ; the stuff below looks like gibberish... here's a mini-tutorial: + + ;store1: + ; lda #1 + ; .byte $2c ; this is the opcode for BIT absolute + ;store2: + ; lda #2 + ; sta $0600 + ; rts + + ; if entered via "jsr store1", the above code fragment executes these + ; instructions: + ; lda #1 + ; bit $02A9 ; $A9 is the LDA immediate opcode, 02 is the #2 + ; sta $0600 + ; rts + + ; if entered via "jsr store2", it's + ; lda #2 + ; sta $0600 + ; rts + + ; the "bit $02a9' doesn't affect any registers other than the flags, + ; and the "sta $0600 : rts" part doesn't depend on any of the flags, + ; so the BIT is effectively a no-op that "masks" the 2-byte LDA #2 + ; instruction "hidden" as its operand. ; ", Taipan? " ; using fall-thru here saves 3 bytes (normally the last instruction @@ -316,7 +316,7 @@ unsigned long __fastcall__ strtonum(const char* nptr); unsigned char firmpos; -/* use page 6 for these buffers, for .xex build. Otherwise they'e BSS. */ +/* use page 6 for these buffers, for .xex build. Otherwise they're BSS. */ #ifdef CART_TARGET char firm[23]; char num_buf[20]; @@ -779,15 +779,17 @@ void new_gun(void) { return; } +/* cprintfancy_centered() does this for 0 to 999999: + | 999999 | + | 99999 | + | 9999 | + | 999 | + | 99 | + | 9 | */ + +#if 0 void cprintfancy_centered(unsigned long num) { if(num < 1000000L) { - /* 0 to 999999: - | 999999 | - | 99999 | - | 9999 | - | 999 | - | 99 | - | 9 | */ cspaces(3); if(num < 100L) cspace(); if(num < 10000L) cspace(); @@ -799,6 +801,19 @@ void cprintfancy_centered(unsigned long num) { } rvs_off(); } +#else +// saves 12 bytes: +void cprintfancy_centered(unsigned long num) { + if(num < 1000000L) { + cspaces(3); + if(num < 100L) cspace(); + if(num < 10000L) cspace(); + } + rvs_on(); + cprintfancy(num); + rvs_off(); +} +#endif /* if BIGNUM, cprintfancy() just converts to bignum and uses cprintfancy_big() to do the work. A bit slower, but fast |