#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 */
typedef int /*<<< orphan*/ clock_t;

/* Variables and functions */
int /*<<< orphan*/ CLOCKS_PER_SEC;
int /*<<< orphan*/ clock();
int /*<<< orphan*/ printf(char *, int /*<<< orphan*/);
int /*<<< orphan*/ sleep(int);
int main(void) {
  printf("CLOCKS_PER_SEC=%ld\n", CLOCKS_PER_SEC);
  sleep(5);
  clock_t c = clock();
  printf("CPU time used so far: %ld\n", c);
  int i = 1;
  while (i < 1000000000)
    i = i + 1;
  c = clock();
  printf("CPU time used so far: %ld\n", c);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2ea2(%rip),%rax
mov    (%rax),%esi
lea    0xeb1(%rip),%rdi
call   1040 <printf@plt>
mov    $0x5,%edi
call   1050 <sleep@plt>
mov    $0x0,%al
call   1030 <clock@plt>
mov    %eax,-0x8(%rbp)
mov    -0x8(%rbp),%esi
lea    0xea2(%rip),%rdi
call   1040 <printf@plt>
movl   $0x1,-0xc(%rbp)
cmpl   $0x3b9aca00,-0xc(%rbp)
jge    1199 <main+0x69>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    117e <main+0x4e>
mov    $0x0,%al
call   1030 <clock@plt>
mov    %eax,-0x8(%rbp)
mov    -0x8(%rbp),%esi
lea    0xe67(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    0x2eb0(%rip),%rax
mov    (%rax),%esi
lea    0xebf(%rip),%rdi
call   1040 <printf@plt>
mov    $0x5,%edi
call   1050 <sleep@plt>
xor    %eax,%eax
call   1030 <clock@plt>
lea    0xeb6(%rip),%rbx
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
call   1030 <clock@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [20 x i8] c"CLOCKS_PER_SEC=%ld\0A\00"
@CLOCKS_PER_SEC = global i32 0
@.str.1 = [27 x i8] c"CPU time used so far: %ld\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = load i32, i32* @CLOCKS_PER_SEC
%5 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %4)
%6 = call i32 @sleep(i32 5)
%7 = call i32 (...) @clock()
store i32 %7, i32* %2
%8 = load i32, i32* %2
%9 = call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0), i32 %8)
store i32 1, i32* %3
br label %10
10: ; preds = %13, %0
%11 = load i32, i32* %3
%12 = icmp slt i32 %11, 1000000000
br i1 %12, label %13, label %16
13: ; preds = %10
%14 = load i32, i32* %3
%15 = add nsw i32 %14, 1
store i32 %15, i32* %3
br label %10
16: ; preds = %10
%17 = call i32 (...) @clock()
store i32 %17, i32* %2
%18 = load i32, i32* %2
%19 = call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0), i32 %18)
ret i32 0
}

LLVM IR (-O2):
@.str = [20 x i8] c"CLOCKS_PER_SEC=%ld\0A\00"
@CLOCKS_PER_SEC = global i32 0
@.str.1 = [27 x i8] c"CPU time used so far: %ld\0A\00"
define i32 @main() {
%1 = load i32, i32* @CLOCKS_PER_SEC
%2 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %1)
%3 = tail call i32 @sleep(i32 5)
%4 = tail call i32 (...) @clock()
%5 = tail call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0), i32 %4)
%6 = tail call i32 (...) @clock()
%7 = tail call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.1, i64 0, i64 0), i32 %6)
ret i32 0
}