cc65/libsrc/pce/clock.s

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ArmAsm
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;
; clock_t clock (void);
;
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.include "pce.inc"
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.export _clock
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.importzp sreg
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.proc _clock
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lda _tickcount+3
sta sreg+1
lda _tickcount+2
sta sreg
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ldx _tickcount+1
lda _tickcount
rts
.endproc