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Factorial no C para AVR e seus códigos gerados em Assembly com GCC
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| 0000024e <_Z9factoriali>: | |
| 24e: 8f 92 push r8 | |
| 250: 9f 92 push r9 | |
| 252: af 92 push r10 | |
| 254: bf 92 push r11 | |
| 256: cf 92 push r12 | |
| 258: df 92 push r13 | |
| 25a: ef 92 push r14 | |
| 25c: ff 92 push r15 | |
| 25e: fc 01 movw r30, r24 | |
| 260: c1 2c mov r12, r1 | |
| 262: d1 2c mov r13, r1 | |
| 264: 76 01 movw r14, r12 | |
| 266: 21 e0 ldi r18, 0x01 ; 1 | |
| 268: 30 e0 ldi r19, 0x00 ; 0 | |
| 26a: 40 e0 ldi r20, 0x00 ; 0 | |
| 26c: 50 e0 ldi r21, 0x00 ; 0 | |
| 26e: 4c 01 movw r8, r24 | |
| 270: aa 24 eor r10, r10 | |
| 272: 97 fc sbrc r9, 7 | |
| 274: a0 94 com r10 | |
| 276: ba 2c mov r11, r10 | |
| 278: c7 01 movw r24, r14 | |
| 27a: b6 01 movw r22, r12 | |
| 27c: 68 0d add r22, r8 | |
| 27e: 79 1d adc r23, r9 | |
| 280: 8a 1d adc r24, r10 | |
| 282: 9b 1d adc r25, r11 | |
| 284: 28 d2 rcall .+1104 ; 0x6d6 <__mulsi3> | |
| 286: 9b 01 movw r18, r22 | |
| 288: ac 01 movw r20, r24 | |
| 28a: 81 e0 ldi r24, 0x01 ; 1 | |
| 28c: c8 1a sub r12, r24 | |
| 28e: d1 08 sbc r13, r1 | |
| 290: e1 08 sbc r14, r1 | |
| 292: f1 08 sbc r15, r1 | |
| 294: cf 01 movw r24, r30 | |
| 296: 8c 0d add r24, r12 | |
| 298: 9d 1d adc r25, r13 | |
| 29a: 89 2b or r24, r25 | |
| 29c: 69 f7 brne .-38 ; 0x278 <_Z9factoriali+0x2a> | |
| 29e: ca 01 movw r24, r20 | |
| 2a0: b9 01 movw r22, r18 | |
| 2a2: ff 90 pop r15 | |
| 2a4: ef 90 pop r14 | |
| 2a6: df 90 pop r13 | |
| 2a8: cf 90 pop r12 | |
| 2aa: bf 90 pop r11 | |
| 2ac: af 90 pop r10 | |
| 2ae: 9f 90 pop r9 | |
| 2b0: 8f 90 pop r8 | |
| 2b2: 08 95 ret |
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| long factorial(int n) { | |
| long result = 1; | |
| do { | |
| result *= n; | |
| while(--n); | |
| return result; | |
| } |
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| 00000250 <_Z9factoriall>: | |
| 250: cf 92 push r12 | |
| 252: df 92 push r13 | |
| 254: ef 92 push r14 | |
| 256: ff 92 push r15 | |
| 258: 6b 01 movw r12, r22 | |
| 25a: 7c 01 movw r14, r24 | |
| 25c: 61 e0 ldi r22, 0x01 ; 1 | |
| 25e: 70 e0 ldi r23, 0x00 ; 0 | |
| 260: 80 e0 ldi r24, 0x00 ; 0 | |
| 262: 90 e0 ldi r25, 0x00 ; 0 | |
| 264: 1c 14 cp r1, r12 | |
| 266: 1d 04 cpc r1, r13 | |
| 268: 1e 04 cpc r1, r14 | |
| 26a: 1f 04 cpc r1, r15 | |
| 26c: 6c f4 brge .+26 ; 0x288 <_Z9factoriall+0x38> | |
| 26e: 9b 01 movw r18, r22 | |
| 270: ac 01 movw r20, r24 | |
| 272: 6c 2d mov r22, r12 | |
| 274: 7d 2d mov r23, r13 | |
| 276: 8e 2d mov r24, r14 | |
| 278: 9f 2d mov r25, r15 | |
| 27a: e1 e0 ldi r30, 0x01 ; 1 | |
| 27c: ce 1a sub r12, r30 | |
| 27e: d1 08 sbc r13, r1 | |
| 280: e1 08 sbc r14, r1 | |
| 282: f1 08 sbc r15, r1 | |
| 284: 1f d2 rcall .+1086 ; 0x6c4 <__mulsi3> | |
| 286: ee cf rjmp .-36 ; 0x264 <_Z9factoriall+0x14> | |
| 288: ff 90 pop r15 | |
| 28a: ef 90 pop r14 | |
| 28c: df 90 pop r13 | |
| 28e: cf 90 pop r12 | |
| 290: 08 95 ret |
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| unsigned long factorial(long n) | |
| { | |
| return n >= 1 ? n * factorial(n - 1) : 1; | |
| } |
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| 00000250 <_Z9factoriall>: | |
| 250: cf 92 push r12 | |
| 252: df 92 push r13 | |
| 254: ef 92 push r14 | |
| 256: ff 92 push r15 | |
| 258: 6b 01 movw r12, r22 | |
| 25a: 7c 01 movw r14, r24 | |
| 25c: 61 e0 ldi r22, 0x01 ; 1 | |
| 25e: 70 e0 ldi r23, 0x00 ; 0 | |
| 260: 80 e0 ldi r24, 0x00 ; 0 | |
| 262: 90 e0 ldi r25, 0x00 ; 0 | |
| 264: c1 14 cp r12, r1 | |
| 266: d1 04 cpc r13, r1 | |
| 268: e1 04 cpc r14, r1 | |
| 26a: f1 04 cpc r15, r1 | |
| 26c: 59 f0 breq .+22 ; 0x284 <_Z9factoriall+0x34> | |
| 26e: 9b 01 movw r18, r22 | |
| 270: ac 01 movw r20, r24 | |
| 272: c7 01 movw r24, r14 | |
| 274: b6 01 movw r22, r12 | |
| 276: 24 d2 rcall .+1096 ; 0x6c0 <__mulsi3> | |
| 278: 21 e0 ldi r18, 0x01 ; 1 | |
| 27a: c2 1a sub r12, r18 | |
| 27c: d1 08 sbc r13, r1 | |
| 27e: e1 08 sbc r14, r1 | |
| 280: f1 08 sbc r15, r1 | |
| 282: f0 cf rjmp .-32 ; 0x264 <_Z9factoriall+0x14> | |
| 284: ff 90 pop r15 | |
| 286: ef 90 pop r14 | |
| 288: df 90 pop r13 | |
| 28a: cf 90 pop r12 | |
| 28c: 08 95 ret |
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| unsigned long factorial_tail(long n, long x=1) | |
| { | |
| return n == 0? x : factorial_tail(n-1, n * x); | |
| } | |
| unsigned long factorial(long n) | |
| { | |
| return factorial_tail( n, 1); | |
| } |
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