#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 uint32_t;

/* Variables and functions */
scalar_t__ EOF;
int /*<<< orphan*/ printf(char *, int, int);
int reverseBits(int);
scalar_t__ scanf(char *, int *);
int main(int argc, char **argv) {
  uint32_t i;
  while (scanf("%u", &i) != EOF) {
    printf("%x = %x\n", i, reverseBits(i));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xeb3(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
mov    0x2e8b(%rip),%rcx
cmp    (%rcx),%rax
je     118a <main+0x5a>
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x14(%rbp),%edi
call   1050 <reverseBits@plt>
mov    -0x18(%rbp),%esi
mov    %eax,%edx
lea    0xe83(%rip),%rdi
call   1030 <printf@plt>
jmp    1146 <main+0x16>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
sub    $0x10,%rsp
lea    0xebd(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0x2e94(%rip),%r12
cmp    (%r12),%rax
je     1198 <main+0x68>
lea    0xea2(%rip),%r14
lea    0xe98(%rip),%r15
lea    0xc(%rsp),%rbx
nopl   (%rax)
mov    0xc(%rsp),%ebp
mov    %ebp,%edi
call   1050 <reverseBits@plt>
mov    %r14,%rdi
mov    %ebp,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %rbx,%rsi
call   1040 <scanf@plt>
cmp    (%r12),%rax
jne    1170 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%u\00"
@EOF = global i64 0
@.str.1 = [9 x i8] c"%x = %x\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
br label %7
7: ; preds = %11, %2
%8 = call i64 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %6)
%9 = load i64, i64* @EOF
%10 = icmp ne i64 %8, %9
br i1 %10, label %11, label %16
11: ; preds = %7
%12 = load i32, i32* %6
%13 = load i32, i32* %6
%14 = call i32 @reverseBits(i32 %13)
%15 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32 %12, i32 %14)
br label %7
16: ; preds = %7
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%u\00"
@EOF = global i64 0
@.str.1 = [9 x i8] c"%x = %x\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = bitcast i32* %3 to i8*
%5 = call i64 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %3)
%6 = load i64, i64* @EOF
%7 = icmp eq i64 %5, %6
br i1 %7, label %15, label %8
8: ; preds = %2, %8
%9 = load i32, i32* %3
%10 = call i32 @reverseBits(i32 %9)
%11 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32 %9, i32 %10)
%12 = call i64 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %3)
%13 = load i64, i64* @EOF
%14 = icmp eq i64 %12, %13
br i1 %14, label %15, label %8
15: ; preds = %8, %2
ret i32 0
}