unsigned char rand(void) {
static unsigned char _seed = 1;
_seed = _seed * 0x41C64E6D + 30562;
return _seed;
}
.text ; return: r24 rand: lds r25,_seed ldi r24,low(109) mul r25,r24 mov r24,r0 clr r1 subi r24,low(-(98)) sts _seed,r24 ret .data _seed: .byte 1
unsigned char rand(void) {
static unsigned char ctx = 1;
#if 1
ctx = ctx * 1103515245 + 12345;
#else
if (ctx == 0)
ctx = 123;
ctx = 16807 * (ctx % 127773) - 2836 * (ctx / 127773);
#endif
return ctx;
}
.text: #if 1 rand: lds r25,ctx ldi r24,low(109) mul r25,r24 mov r24,r0 clr r1 subi r24,low(-(57)) sts ctx,r24 ret #else rand: lds r24,ctx clr r1 cpse r24,r1 rjmp .L2 ldi r24,low(123) sts ctx,r24 .L2: lds r22,ctx ldi r23,low(0) ldi r24,low(0) ldi r25,low(0) ldi r18,low(29) ldi r19,low(-13) ldi r20,low(1) ldi r21,low(0) call __divmodsi4 ldi r24,low(-89) mul r22,r24 mov r24,r0 clr r1 sts ctx,r24 ret __divmodsi4: mov r0,r21 bst r25,7 brtc .+4 com r0 rcall __divmodsi4_neg1 sbrc r21,7 rcall __divmodsi4_neg2 rcall __udivmodsi4 sbrc r0,7 rcall __divmodsi4_neg2 brtc __divmodsi4_exit __divmodsi4_neg1: com r25 com r24 com r23 neg r22 sbci r23,0xFF sbci r24,0xFF sbci r25,0xFF ret __divmodsi4_neg2: com r21 com r20 com r19 neg r18 sbci r19,0xFF sbci r20,0xFF sbci r21,0xFF __divmodsi4_exit: ret __udivmodsi4: ldi r26,0x21 mov r1,r26 sub r26,r26 sub r27,r27 movw r30,r26 rjmp __udivmodsi4_ep __udivmodsi4_loop: adc r26,r26 adc r27,r27 adc r30,r30 adc r31,r31 cp r26,r18 cpc r27,r19 cpc r30,r20 cpc r31,r21 brcs __udivmodsi4_ep sub r26,r18 sbc r27,r19 sbc r30,r20 sbc r31,r21 __udivmodsi4_ep: adc r22,r22 adc r23,r23 adc r24,r24 adc r25,r25 dec r1 brne __udivmodsi4_loop com r22 com r23 com r24 com r25 movw r18,r22 movw r20,r24 movw r22,r26 movw r24,r30 ret #endif .data: ctx: .bute 1
unsigned long seed;
.
.
.
void my_rand(void)
{
seed = (seed*1664525)+1013904223;
}
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