#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 */
struct timespec {
  unsigned long tv_sec;
  unsigned long tv_nsec;
};

/* Variables and functions */
scalar_t__ EINTR;
scalar_t__ errno;
int nanosleep(struct timespec *, struct timespec *);
void usleep(unsigned long usec) {
  struct timespec ts;
  ts.tv_sec = usec / 1000000UL;
  ts.tv_nsec = (usec % 1000000UL) * 1000;
  while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
    ;
}


x86 assembly (clang, -O0):
<usleep>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
mov    $0xf4240,%ecx
xor    %edx,%edx
div    %rcx
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rax
mov    $0xf4240,%ecx
xor    %edx,%edx
div    %rcx
imul   $0x3e8,%rdx,%rax
mov    %rax,-0x10(%rbp)
lea    -0x18(%rbp),%rsi
mov    %rsi,%rdi
call   1030 <nanosleep@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    $0xffffffff,%ecx
mov    %al,-0x19(%rbp)
jne    117d <usleep+0x6d>
mov    0x2e76(%rip),%rax
mov    (%rax),%rax
mov    0x2e64(%rip),%rcx
cmp    (%rcx),%rax
sete   %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    118d <usleep+0x7d>
jmp    1192 <usleep+0x82>
jmp    1147 <usleep+0x37>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<usleep>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
movabs $0x431bde82d7b634db,%rcx
de 1b 43
mov    %rdi,%rax
mul    %rcx
shr    $0x12,%rdx
mov    %rdx,(%rsp)
imul   $0xf4240,%rdx,%rax
sub    %rax,%rdi
imul   $0x3e8,%rdi,%rax
mov    %rax,0x8(%rsp)
mov    %rsp,%rbx
mov    0x2e8f(%rip),%r14
mov    0x2e80(%rip),%r15
nopl   0x0(%rax,%rax,1)
mov    %rbx,%rdi
mov    %rbx,%rsi
call   1030 <nanosleep@plt>
cmp    $0xffffffff,%eax
jne    1178 <usleep+0x68>
mov    (%r15),%rax
cmp    %rax,(%r14)
je     1160 <usleep+0x50>
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
%struct.timespec = type { i64, i64 }
@errno = global i64 0
@EINTR = global i64 0
define void @usleep(i64 %0) {
%2 = alloca i64
%3 = alloca %struct.timespec
store i64 %0, i64* %2
%4 = load i64, i64* %2
%5 = udiv i64 %4, 1000000
%6 = getelementptr inbounds %struct.timespec, %struct.timespec* %3, i32 0, i32 0
store i64 %5, i64* %6
%7 = load i64, i64* %2
%8 = urem i64 %7, 1000000
%9 = mul i64 %8, 1000
%10 = getelementptr inbounds %struct.timespec, %struct.timespec* %3, i32 0, i32 1
store i64 %9, i64* %10
br label %11
11: ; preds = %20, %1
%12 = call i32 @nanosleep(%struct.timespec* %3, %struct.timespec* %3)
%13 = icmp eq i32 %12, -1
br i1 %13, label %14, label %18
14: ; preds = %11
%15 = load i64, i64* @errno
%16 = load i64, i64* @EINTR
%17 = icmp eq i64 %15, %16
br label %18
18: ; preds = %14, %11
%19 = phi i1 [ false, %11 ], [ %17, %14 ]
br i1 %19, label %20, label %21
20: ; preds = %18
br label %11
21: ; preds = %18
ret void
}

LLVM IR (-O2):
%struct.timespec = type { i64, i64 }
@errno = global i64 0
@EINTR = global i64 0
define void @usleep(i64 %0) {
%2 = alloca %struct.timespec
%3 = bitcast %struct.timespec* %2 to i8*
%4 = udiv i64 %0, 1000000
%5 = getelementptr inbounds %struct.timespec, %struct.timespec* %2, i64 0, i32 0
store i64 %4, i64* %5
%6 = urem i64 %0, 1000000
%7 = mul nuw nsw i64 %6, 1000
%8 = getelementptr inbounds %struct.timespec, %struct.timespec* %2, i64 0, i32 1
store i64 %7, i64* %8
br label %9
9: ; preds = %9, %1
%10 = call i32 @nanosleep(%struct.timespec* %2, %struct.timespec* %2)
%11 = icmp eq i32 %10, -1
%12 = load i64, i64* @errno
%13 = load i64, i64* @EINTR
%14 = icmp eq i64 %12, %13
%15 = select i1 %11, i1 %14, i1 false
br i1 %15, label %9, label %16
16: ; preds = %9
ret void
}