On Mon, Dec 6, 2010 at 2:40 AM, thefox xofeht <thefox@aspekt.fi> wrote: > Read the value to a dummy variable. If there's a better way, I'd like > to know also. That does cause the read to happen, but now the optimizer is not being smart enough. It doesn't realize the dummy variable is never used and it is unnecessarily pushed/popped to the parameter stack: 000000r 1 .proc _foo: near 000000r 1 000000r 1 .segment "CODE" 000000r 1 000000r 1 ; 000000r 1 ; uint8_t dummy = IO_Read8(0x2002); 000000r 1 ; 000000r 1 AD 02 20 lda $2002 000003r 1 20 rr rr jsr pusha 000006r 1 ; 000006r 1 ; IO_Write8(0x2006, 0x20); 000006r 1 ; 000006r 1 A9 20 lda #$20 000008r 1 8D 06 20 sta $2006 00000Br 1 ; 00000Br 1 ; IO_Write8(0x2006, 0x00); 00000Br 1 ; 00000Br 1 A9 00 lda #$00 00000Dr 1 8D 06 20 sta $2006 000010r 1 ; 000010r 1 ; } 000010r 1 ; 000010r 1 4C rr rr jmp incsp1 000013r 1 000013r 1 .endproc -Dave ---------------------------------------------------------------------- To unsubscribe from the list send mail to majordomo@musoftware.de with the string "unsubscribe cc65" in the body(!) of the mail.Received on Mon Dec 6 15:49:04 2010
This archive was generated by hypermail 2.1.8 : 2010-12-06 15:49:07 CET