#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 /*<<< orphan*/ assert(int);
int leftmost_one(int);
int main(int argc, char *argv[]) {
  assert(leftmost_one(0xFF00) == 0x8000);
  assert(leftmost_one(0x6000) == 0x4000);
  assert(leftmost_one(0x0) == 0x0);
  assert(leftmost_one(0x80000000) == 0x80000000);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    $0xff00,%edi
call   1040 <leftmost_one@plt>
cmp    $0x8000,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1030 <assert@plt>
mov    $0x6000,%edi
call   1040 <leftmost_one@plt>
cmp    $0x4000,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1030 <assert@plt>
xor    %edi,%edi
call   1040 <leftmost_one@plt>
cmp    $0x0,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1030 <assert@plt>
mov    $0x80000000,%edi
call   1040 <leftmost_one@plt>
cmp    $0x80000000,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1030 <assert@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
mov    $0xff00,%edi
call   1040 <leftmost_one@plt>
xor    %edi,%edi
cmp    $0x8000,%eax
sete   %dil
call   1030 <assert@plt>
mov    $0x6000,%edi
call   1040 <leftmost_one@plt>
xor    %edi,%edi
cmp    $0x4000,%eax
sete   %dil
call   1030 <assert@plt>
xor    %edi,%edi
call   1040 <leftmost_one@plt>
xor    %edi,%edi
test   %eax,%eax
sete   %dil
call   1030 <assert@plt>
mov    $0x80000000,%edi
call   1040 <leftmost_one@plt>
xor    %edi,%edi
cmp    $0x80000000,%eax
sete   %dil
call   1030 <assert@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = call i32 @leftmost_one(i32 65280)
%7 = icmp eq i32 %6, 32768
%8 = zext i1 %7 to i32
%9 = call i32 @assert(i32 %8)
%10 = call i32 @leftmost_one(i32 24576)
%11 = icmp eq i32 %10, 16384
%12 = zext i1 %11 to i32
%13 = call i32 @assert(i32 %12)
%14 = call i32 @leftmost_one(i32 0)
%15 = icmp eq i32 %14, 0
%16 = zext i1 %15 to i32
%17 = call i32 @assert(i32 %16)
%18 = call i32 @leftmost_one(i32 -2147483648)
%19 = icmp eq i32 %18, -2147483648
%20 = zext i1 %19 to i32
%21 = call i32 @assert(i32 %20)
ret i32 0
}

LLVM IR (-O2):
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @leftmost_one(i32 65280)
%4 = icmp eq i32 %3, 32768
%5 = zext i1 %4 to i32
%6 = tail call i32 @assert(i32 %5)
%7 = tail call i32 @leftmost_one(i32 24576)
%8 = icmp eq i32 %7, 16384
%9 = zext i1 %8 to i32
%10 = tail call i32 @assert(i32 %9)
%11 = tail call i32 @leftmost_one(i32 0)
%12 = icmp eq i32 %11, 0
%13 = zext i1 %12 to i32
%14 = tail call i32 @assert(i32 %13)
%15 = tail call i32 @leftmost_one(i32 -2147483648)
%16 = icmp eq i32 %15, -2147483648
%17 = zext i1 %16 to i32
%18 = tail call i32 @assert(i32 %17)
ret i32 0
}