#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int EXIT_SUCCESS;
int /*<<< orphan*/ _IOLBF;
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ setvbuf(int /*<<< orphan*/, int /*<<< orphan*/ *,
                           int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ sleep(int);
int /*<<< orphan*/ stdout;
int main() {
  int i;
  setvbuf(stdout, NULL, _IOLBF, 0);
  for (i = 0; i < 5; ++i) {
    sleep(1);
    printf("%d\n", i);
  }
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e92(%rip),%rax
mov    (%rax),%edi
mov    0x2e91(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
xor    %ecx,%ecx
call   1040 <setvbuf@plt>
movl   $0x0,-0x8(%rbp)
cmpl   $0x5,-0x8(%rbp)
jge    1194 <main+0x64>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    -0x8(%rbp),%esi
lea    0xe7f(%rip),%rdi
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1163 <main+0x33>
mov    0x2e35(%rip),%rax
mov    (%rax),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    0x2ea0(%rip),%rax
mov    (%rax),%edi
mov    0x2e9f(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
xor    %ecx,%ecx
call   1040 <setvbuf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
lea    0xea3(%rip),%rbx
mov    %rbx,%rdi
xor    %esi,%esi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    %rbx,%rdi
mov    $0x1,%esi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    %rbx,%rdi
mov    $0x2,%esi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    %rbx,%rdi
mov    $0x3,%esi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    %rbx,%rdi
mov    $0x4,%esi
call   1030 <printf@plt>
mov    0x2e06(%rip),%rax
mov    (%rax),%eax
pop    %rbx
ret

LLVM IR (-O0):
@stdout = global i32 0
@_IOLBF = global i32 0
@.str = [4 x i8] c"%d\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = load i32, i32* @stdout
%4 = load i32, i32* @_IOLBF
%5 = call i32 @setvbuf(i32 %3, i32* null, i32 %4, i32 0)
store i32 0, i32* %2
br label %6
6: ; preds = %13, %0
%7 = load i32, i32* %2
%8 = icmp slt i32 %7, 5
br i1 %8, label %9, label %16
9: ; preds = %6
%10 = call i32 @sleep(i32 1)
%11 = load i32, i32* %2
%12 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %11)
br label %13
13: ; preds = %9
%14 = load i32, i32* %2
%15 = add nsw i32 %14, 1
store i32 %15, i32* %2
br label %6
16: ; preds = %6
%17 = load i32, i32* @EXIT_SUCCESS
ret i32 %17
}

LLVM IR (-O2):
@stdout = global i32 0
@_IOLBF = global i32 0
@.str = [4 x i8] c"%d\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = load i32, i32* @stdout
%2 = load i32, i32* @_IOLBF
%3 = tail call i32 @setvbuf(i32 %1, i32* null, i32 %2, i32 0)
%4 = tail call i32 @sleep(i32 1)
%5 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 0)
%6 = tail call i32 @sleep(i32 1)
%7 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1)
%8 = tail call i32 @sleep(i32 1)
%9 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2)
%10 = tail call i32 @sleep(i32 1)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%12 = tail call i32 @sleep(i32 1)
%13 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 4)
%14 = load i32, i32* @EXIT_SUCCESS
ret i32 %14
}