#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 reverse_bits_v1(int);
int reverse_bits_v2(int);
int main() {
  assert(0x00000000 == reverse_bits_v1(0x00000000));
  assert(0x00000000 == reverse_bits_v2(0x00000000));
  assert(0xaaaaaaaa == reverse_bits_v1(0x55555555));
  assert(0xaaaaaaaa == reverse_bits_v2(0x55555555));
  assert(0xf33f0000 == reverse_bits_v1(0x0000fccf));
  assert(0xf33f0000 == reverse_bits_v2(0x0000fccf));
  assert(0x88ff0000 == reverse_bits_v1(0x0000ff11));
  assert(0x88ff0000 == reverse_bits_v2(0x0000ff11));
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
xor    %edi,%edi
call   1030 <reverse_bits_v1@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
xor    %edi,%edi
call   1050 <reverse_bits_v2@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0x55555555,%edi
call   1030 <reverse_bits_v1@plt>
mov    %eax,%ecx
mov    $0xaaaaaaaa,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0x55555555,%edi
call   1050 <reverse_bits_v2@plt>
mov    %eax,%ecx
mov    $0xaaaaaaaa,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xfccf,%edi
call   1030 <reverse_bits_v1@plt>
mov    %eax,%ecx
mov    $0xf33f0000,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xfccf,%edi
call   1050 <reverse_bits_v2@plt>
mov    %eax,%ecx
mov    $0xf33f0000,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xff11,%edi
call   1030 <reverse_bits_v1@plt>
mov    %eax,%ecx
mov    $0x88ff0000,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xff11,%edi
call   1050 <reverse_bits_v2@plt>
mov    %eax,%ecx
mov    $0x88ff0000,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
xor    %edi,%edi
call   1030 <reverse_bits_v1@plt>
xor    %edi,%edi
test   %eax,%eax
sete   %dil
call   1040 <assert@plt>
xor    %edi,%edi
call   1050 <reverse_bits_v2@plt>
xor    %edi,%edi
test   %eax,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0x55555555,%edi
call   1030 <reverse_bits_v1@plt>
xor    %edi,%edi
cmp    $0xaaaaaaaa,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0x55555555,%edi
call   1050 <reverse_bits_v2@plt>
xor    %edi,%edi
cmp    $0xaaaaaaaa,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xfccf,%edi
call   1030 <reverse_bits_v1@plt>
xor    %edi,%edi
cmp    $0xf33f0000,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xfccf,%edi
call   1050 <reverse_bits_v2@plt>
xor    %edi,%edi
cmp    $0xf33f0000,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xff11,%edi
call   1030 <reverse_bits_v1@plt>
xor    %edi,%edi
cmp    $0x88ff0000,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xff11,%edi
call   1050 <reverse_bits_v2@plt>
xor    %edi,%edi
cmp    $0x88ff0000,%eax
sete   %dil
call   1040 <assert@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
define i32 @main() {
%1 = alloca i32
store i32 0, i32* %1
%2 = call i32 @reverse_bits_v1(i32 0)
%3 = icmp eq i32 0, %2
%4 = zext i1 %3 to i32
%5 = call i32 @assert(i32 %4)
%6 = call i32 @reverse_bits_v2(i32 0)
%7 = icmp eq i32 0, %6
%8 = zext i1 %7 to i32
%9 = call i32 @assert(i32 %8)
%10 = call i32 @reverse_bits_v1(i32 1431655765)
%11 = icmp eq i32 -1431655766, %10
%12 = zext i1 %11 to i32
%13 = call i32 @assert(i32 %12)
%14 = call i32 @reverse_bits_v2(i32 1431655765)
%15 = icmp eq i32 -1431655766, %14
%16 = zext i1 %15 to i32
%17 = call i32 @assert(i32 %16)
%18 = call i32 @reverse_bits_v1(i32 64719)
%19 = icmp eq i32 -213975040, %18
%20 = zext i1 %19 to i32
%21 = call i32 @assert(i32 %20)
%22 = call i32 @reverse_bits_v2(i32 64719)
%23 = icmp eq i32 -213975040, %22
%24 = zext i1 %23 to i32
%25 = call i32 @assert(i32 %24)
%26 = call i32 @reverse_bits_v1(i32 65297)
%27 = icmp eq i32 -1996554240, %26
%28 = zext i1 %27 to i32
%29 = call i32 @assert(i32 %28)
%30 = call i32 @reverse_bits_v2(i32 65297)
%31 = icmp eq i32 -1996554240, %30
%32 = zext i1 %31 to i32
%33 = call i32 @assert(i32 %32)
ret i32 0
}

LLVM IR (-O2):
define i32 @main() {
%1 = tail call i32 @reverse_bits_v1(i32 0)
%2 = icmp eq i32 %1, 0
%3 = zext i1 %2 to i32
%4 = tail call i32 @assert(i32 %3)
%5 = tail call i32 @reverse_bits_v2(i32 0)
%6 = icmp eq i32 %5, 0
%7 = zext i1 %6 to i32
%8 = tail call i32 @assert(i32 %7)
%9 = tail call i32 @reverse_bits_v1(i32 1431655765)
%10 = icmp eq i32 %9, -1431655766
%11 = zext i1 %10 to i32
%12 = tail call i32 @assert(i32 %11)
%13 = tail call i32 @reverse_bits_v2(i32 1431655765)
%14 = icmp eq i32 %13, -1431655766
%15 = zext i1 %14 to i32
%16 = tail call i32 @assert(i32 %15)
%17 = tail call i32 @reverse_bits_v1(i32 64719)
%18 = icmp eq i32 %17, -213975040
%19 = zext i1 %18 to i32
%20 = tail call i32 @assert(i32 %19)
%21 = tail call i32 @reverse_bits_v2(i32 64719)
%22 = icmp eq i32 %21, -213975040
%23 = zext i1 %22 to i32
%24 = tail call i32 @assert(i32 %23)
%25 = tail call i32 @reverse_bits_v1(i32 65297)
%26 = icmp eq i32 %25, -1996554240
%27 = zext i1 %26 to i32
%28 = tail call i32 @assert(i32 %27)
%29 = tail call i32 @reverse_bits_v2(i32 65297)
%30 = icmp eq i32 %29, -1996554240
%31 = zext i1 %30 to i32
%32 = tail call i32 @assert(i32 %31)
ret i32 0
}