;
+; clock.s
+;
; Written by Groepaz/Hitmen <groepaz@gmx.net>
; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
+; 2003-05-02, Greg King <gngking@erols.com>
+;
+; #include <time.h>
;
; clock_t clock (void);
;
ldy #0 ; High word is always zero
sty sreg+1
sty sreg
- ldx tickcount+1 ; ## Problem: Cannot disable ints here
+L1: ldx tickcount+1
lda tickcount
+ cpx tickcount+1 ; Did tickcount change?
+ bne L1 ; Yes, re-read it
rts
.endproc