time for 2^32 loops in C, golang, Python

code.txt

$ cat loop.c
int main()
{
    long i;
    for (i=0; i<(1L<<32); i++) {
    }
    return 0;
}

$ cat loop.go
package main

func main() {
     for i := 0; i < (1<<32); i++ {
     }
}

$ cat loop.py
i = 0
while i < (1<<32):
    i += 1

$ gcc loop.c -o loop-c

$ objdump -d loop-c | awk '/<main>:/,/^$/'
00000000004004ed <main>:
  4004ed:       55                      push   rbp
  4004ee:       48 89 e5                mov    rbp,rsp
  4004f1:       48 c7 45 f8 00 00 00    mov    QWORD PTR [rbp-0x8],0x0
  4004f8:       00
  4004f9:       eb 05                   jmp    400500 <main+0x13>
  4004fb:       48 83 45 f8 01          add    QWORD PTR [rbp-0x8],0x1
  400500:       b8 ff ff ff ff          mov    eax,0xffffffff
  400505:       48 39 45 f8             cmp    QWORD PTR [rbp-0x8],rax
  400509:       7e f0                   jle    4004fb <main+0xe>
  40050b:       b8 00 00 00 00          mov    eax,0x0
  400510:       5d                      pop    rbp
  400511:       c3                      ret
  400512:       66 2e 0f 1f 84 00 00    nop    WORD PTR cs:[rax+rax*1+0x0]
  400519:       00 00 00
  40051c:       0f 1f 40 00             nop    DWORD PTR [rax+0x0]


$ gcc -O1 loop.c -o loop-c1

$ objdump -d loop-c1 | awk '/<main>:/,/^$/'
00000000004004ed <main>:
  4004ed:       48 b8 00 00 00 00 01    movabs rax,0x100000000
  4004f4:       00 00 00
  4004f7:       48 83 e8 01             sub    rax,0x1
  4004fb:       75 fa                   jne    4004f7 <main+0xa>
  4004fd:       b8 00 00 00 00          mov    eax,0x0
  400502:       c3                      ret
  400503:       66 2e 0f 1f 84 00 00    nop    WORD PTR cs:[rax+rax*1+0x0]
  40050a:       00 00 00
  40050d:       0f 1f 00                nop    DWORD PTR [rax]


$ gcc -O2 loop.c -o loop-c2

$ objdump -d loop-c2 | awk '/<main>:/,/^$/'
0000000000400400 <main>:
  400400:       31 c0                   xor    eax,eax
  400402:       c3                      ret


$ go build -o loop-go loop.go

$ objdump -d loop-go | awk '/<main.main>:/,/^$/'
0000000000400c00 <main.main>:
  400c00:       48 31 c0                xor    rax,rax
  400c03:       48 bd 00 00 00 00 01    movabs rbp,0x100000000
  400c0a:       00 00 00
  400c0d:       48 39 e8                cmp    rax,rbp
  400c10:       7d 12                   jge    400c24 <main.main+0x24>
  400c12:       48 ff c0                inc    rax
  400c15:       48 bd 00 00 00 00 01    movabs rbp,0x100000000
  400c1c:       00 00 00
  400c1f:       48 39 e8                cmp    rax,rbp
  400c22:       7c ee                   jl     400c12 <main.main+0x12>
  400c24:       c3                      ret
        ...

result.txt

$ time ./loop-c

real    0m10.693s
user    0m10.676s
sys     0m0.004s

$ time ./loop-c1

real    0m1.855s
user    0m1.852s
sys     0m0.000s

$ time ./loop-go

real    0m2.178s
user    0m2.172s
sys     0m0.036s

$ time python loop.py

real    5m2.412s
user    5m2.188s
sys     0m0.016s