#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 useconds_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, unsigned int);
int /*<<< orphan*/ puts(char *);
int /*<<< orphan*/ sleep(unsigned int);
int /*<<< orphan*/ usleep(int);
int main(void) {
  puts("usleep 1 x 1000*1000");
  for (int i = 0; i < 10; i++) {
    useconds_t us = i * 1000 * 1000;
    printf("calling usleep(%u)\n", (unsigned int)us);
    usleep(us);
    puts("wake up");
  }
  puts("sleep 1");
  for (int i = 0; i < 10; i++) {
    unsigned int s = i;
    printf("calling sleep(%u)\n", s);
    sleep(s);
    puts("wake up");
  }
  puts("done");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
call   1030 <puts@plt>
movl   $0x0,-0x8(%rbp)
cmpl   $0xa,-0x8(%rbp)
jge    11ad <main+0x6d>
imul   $0x3e8,-0x8(%rbp),%eax
imul   $0x3e8,%eax,%eax
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%esi
lea    0xe8f(%rip),%rdi
call   1040 <printf@plt>
mov    -0xc(%rbp),%edi
call   1060 <usleep@plt>
lea    0xe8f(%rip),%rdi
call   1030 <puts@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1162 <main+0x22>
lea    0xe7d(%rip),%rdi
call   1030 <puts@plt>
movl   $0x0,-0x10(%rbp)
cmpl   $0xa,-0x10(%rbp)
jge    1201 <main+0xc1>
mov    -0x10(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%esi
lea    0xe5f(%rip),%rdi
call   1040 <printf@plt>
mov    -0x14(%rbp),%edi
call   1050 <sleep@plt>
lea    0xe3b(%rip),%rdi
call   1030 <puts@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    11c0 <main+0x80>
lea    0xe44(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
lea    0xeb5(%rip),%rdi
call   1030 <puts@plt>
lea    0xebe(%rip),%rbx
mov    %rbx,%rdi
xor    %esi,%esi
call   1040 <printf@plt>
xor    %edi,%edi
call   1060 <usleep@plt>
lea    0xeba(%rip),%r14
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0xf4240,%esi
call   1040 <printf@plt>
mov    $0xf4240,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x1e8480,%esi
call   1040 <printf@plt>
mov    $0x1e8480,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x2dc6c0,%esi
call   1040 <printf@plt>
mov    $0x2dc6c0,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x3d0900,%esi
call   1040 <printf@plt>
mov    $0x3d0900,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x4c4b40,%esi
call   1040 <printf@plt>
mov    $0x4c4b40,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x5b8d80,%esi
call   1040 <printf@plt>
mov    $0x5b8d80,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x6acfc0,%esi
call   1040 <printf@plt>
mov    $0x6acfc0,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x7a1200,%esi
call   1040 <printf@plt>
mov    $0x7a1200,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x895440,%esi
call   1040 <printf@plt>
mov    $0x895440,%edi
call   1060 <usleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
lea    0xd9c(%rip),%rdi
call   1030 <puts@plt>
lea    0xd98(%rip),%rbx
mov    %rbx,%rdi
xor    %esi,%esi
call   1040 <printf@plt>
xor    %edi,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x1,%esi
call   1040 <printf@plt>
mov    $0x1,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x2,%esi
call   1040 <printf@plt>
mov    $0x2,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x3,%esi
call   1040 <printf@plt>
mov    $0x3,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x4,%esi
call   1040 <printf@plt>
mov    $0x4,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x5,%esi
call   1040 <printf@plt>
mov    $0x5,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x6,%esi
call   1040 <printf@plt>
mov    $0x6,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x7,%esi
call   1040 <printf@plt>
mov    $0x7,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x8,%esi
call   1040 <printf@plt>
mov    $0x8,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x9,%esi
call   1040 <printf@plt>
mov    $0x9,%edi
call   1050 <sleep@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
lea    0xc74(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [21 x i8] c"usleep 1 x 1000*1000\00"
@.str.1 = [20 x i8] c"calling usleep(%u)\0A\00"
@.str.2 = [8 x i8] c"wake up\00"
@.str.3 = [8 x i8] c"sleep 1\00"
@.str.4 = [19 x i8] c"calling sleep(%u)\0A\00"
@.str.5 = [5 x i8] c"done\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
%6 = call i32 @puts(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %2
br label %7
7: ; preds = %19, %0
%8 = load i32, i32* %2
%9 = icmp slt i32 %8, 10
br i1 %9, label %10, label %22
10: ; preds = %7
%11 = load i32, i32* %2
%12 = mul nsw i32 %11, 1000
%13 = mul nsw i32 %12, 1000
store i32 %13, i32* %3
%14 = load i32, i32* %3
%15 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 %14)
%16 = load i32, i32* %3
%17 = call i32 @usleep(i32 %16)
%18 = call i32 @puts(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
br label %19
19: ; preds = %10
%20 = load i32, i32* %2
%21 = add nsw i32 %20, 1
store i32 %21, i32* %2
br label %7
22: ; preds = %7
%23 = call i32 @puts(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0))
store i32 0, i32* %4
br label %24
24: ; preds = %34, %22
%25 = load i32, i32* %4
%26 = icmp slt i32 %25, 10
br i1 %26, label %27, label %37
27: ; preds = %24
%28 = load i32, i32* %4
store i32 %28, i32* %5
%29 = load i32, i32* %5
%30 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 %29)
%31 = load i32, i32* %5
%32 = call i32 @sleep(i32 %31)
%33 = call i32 @puts(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
br label %34
34: ; preds = %27
%35 = load i32, i32* %4
%36 = add nsw i32 %35, 1
store i32 %36, i32* %4
br label %24
37: ; preds = %24
%38 = call i32 @puts(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.5, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [21 x i8] c"usleep 1 x 1000*1000\00"
@.str.1 = [20 x i8] c"calling usleep(%u)\0A\00"
@.str.2 = [8 x i8] c"wake up\00"
@.str.3 = [8 x i8] c"sleep 1\00"
@.str.4 = [19 x i8] c"calling sleep(%u)\0A\00"
@.str.5 = [5 x i8] c"done\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
%2 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 0)
%3 = tail call i32 @usleep(i32 0)
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%5 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 1000000)
%6 = tail call i32 @usleep(i32 1000000)
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%8 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 2000000)
%9 = tail call i32 @usleep(i32 2000000)
%10 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%11 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 3000000)
%12 = tail call i32 @usleep(i32 3000000)
%13 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%14 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 4000000)
%15 = tail call i32 @usleep(i32 4000000)
%16 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%17 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 5000000)
%18 = tail call i32 @usleep(i32 5000000)
%19 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%20 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 6000000)
%21 = tail call i32 @usleep(i32 6000000)
%22 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%23 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 7000000)
%24 = tail call i32 @usleep(i32 7000000)
%25 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%26 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 8000000)
%27 = tail call i32 @usleep(i32 8000000)
%28 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%29 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 9000000)
%30 = tail call i32 @usleep(i32 9000000)
%31 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%32 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0))
%33 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 0)
%34 = tail call i32 @sleep(i32 0)
%35 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%36 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 1)
%37 = tail call i32 @sleep(i32 1)
%38 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%39 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 2)
%40 = tail call i32 @sleep(i32 2)
%41 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%42 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 3)
%43 = tail call i32 @sleep(i32 3)
%44 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%45 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 4)
%46 = tail call i32 @sleep(i32 4)
%47 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%48 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 5)
%49 = tail call i32 @sleep(i32 5)
%50 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%51 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 6)
%52 = tail call i32 @sleep(i32 6)
%53 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%54 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 7)
%55 = tail call i32 @sleep(i32 7)
%56 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%57 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 8)
%58 = tail call i32 @sleep(i32 8)
%59 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%60 = tail call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 9)
%61 = tail call i32 @sleep(i32 9)
%62 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
%63 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.5, i64 0, i64 0))
ret i32 0
}