loop_comparison.c

#include <cstdio>

void loop_up() {
    for (int i = 0; i < 42; ++i) {
        printf("Hello");
    }
}

void loop_down() {
    for (int i = 42; i; --i) {
        printf("Hello");
    }
}

/*
.LC0:
        .string "Hello"
loop_up():
        push    rbx
        mov     ebx, 42
.L2:
        xor     eax, eax
        mov     edi, OFFSET FLAT:.LC0
        call    printf
        sub     ebx, 1
        jne     .L2
        pop     rbx
        ret
loop_down():
        push    rbx
        mov     ebx, 42
.L7:
        xor     eax, eax
        mov     edi, OFFSET FLAT:.LC0
        call    printf
        sub     ebx, 1
        jne     .L7
        pop     rbx
        ret
*/