#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 */
unsigned int htonl(unsigned int);
int /*<<< orphan*/ printf(char *, unsigned char, unsigned char, unsigned char,
                          unsigned char);
int main(void) {
  unsigned int x = 0x12345678;
  unsigned char *p = (unsigned char *)&x;
  printf("%x %x %x %x\n", p[0], p[1], p[2], p[3]);
  unsigned int y = htonl(x);
  p = (unsigned char *)&y;
  printf("%x %x %x %x\n", p[0], p[1], p[2], p[3]);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x12345678,-0x8(%rbp)
lea    -0x8(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    (%rax),%sil
mov    -0x10(%rbp),%rax
mov    0x1(%rax),%dl
mov    -0x10(%rbp),%rax
mov    0x2(%rax),%cl
mov    -0x10(%rbp),%rax
lea    0xea2(%rip),%rdi
movzbl %sil,%esi
movzbl %dl,%edx
movzbl %cl,%ecx
movzbl 0x3(%rax),%r8d
call   1030 <printf@plt>
mov    -0x8(%rbp),%edi
call   1040 <htonl@plt>
mov    %eax,-0x14(%rbp)
lea    -0x14(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    (%rax),%sil
mov    -0x10(%rbp),%rax
mov    0x1(%rax),%dl
mov    -0x10(%rbp),%rax
mov    0x2(%rax),%cl
mov    -0x10(%rbp),%rax
lea    0xe5b(%rip),%rdi
movzbl %sil,%esi
movzbl %dl,%edx
movzbl %cl,%ecx
movzbl 0x3(%rax),%r8d
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
lea    0xed5(%rip),%r14
mov    %r14,%rdi
mov    $0x78,%esi
mov    $0x56,%edx
mov    $0x34,%ecx
mov    $0x12,%r8d
call   1030 <printf@plt>
mov    $0x12345678,%edi
call   1040 <htonl@plt>
mov    %eax,%ecx
shr    $0x10,%ecx
mov    %eax,%ebx
shr    $0x18,%ebx
movzbl %al,%esi
movzbl %ah,%edx
movzbl %cl,%ecx
mov    %r14,%rdi
mov    %ebx,%r8d
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [13 x i8] c"%x %x %x %x\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
store i32 0, i32* %1
store i32 305419896, i32* %2
%5 = bitcast i32* %2 to i8*
store i8* %5, i8** %3
%6 = load i8*, i8** %3
%7 = getelementptr inbounds i8, i8* %6, i64 0
%8 = load i8, i8* %7
%9 = load i8*, i8** %3
%10 = getelementptr inbounds i8, i8* %9, i64 1
%11 = load i8, i8* %10
%12 = load i8*, i8** %3
%13 = getelementptr inbounds i8, i8* %12, i64 2
%14 = load i8, i8* %13
%15 = load i8*, i8** %3
%16 = getelementptr inbounds i8, i8* %15, i64 3
%17 = load i8, i8* %16
%18 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8 zeroext %8, i8 zeroext %11, i8 zeroext %14, i8 zeroext %17)
%19 = load i32, i32* %2
%20 = call i32 @htonl(i32 %19)
store i32 %20, i32* %4
%21 = bitcast i32* %4 to i8*
store i8* %21, i8** %3
%22 = load i8*, i8** %3
%23 = getelementptr inbounds i8, i8* %22, i64 0
%24 = load i8, i8* %23
%25 = load i8*, i8** %3
%26 = getelementptr inbounds i8, i8* %25, i64 1
%27 = load i8, i8* %26
%28 = load i8*, i8** %3
%29 = getelementptr inbounds i8, i8* %28, i64 2
%30 = load i8, i8* %29
%31 = load i8*, i8** %3
%32 = getelementptr inbounds i8, i8* %31, i64 3
%33 = load i8, i8* %32
%34 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8 zeroext %24, i8 zeroext %27, i8 zeroext %30, i8 zeroext %33)
ret i32 0
}

LLVM IR (-O2):
@.str = [13 x i8] c"%x %x %x %x\0A\00"
define i32 @main() {
%1 = tail call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8 zeroext 120, i8 zeroext 86, i8 zeroext 52, i8 zeroext 18)
%2 = tail call i32 @htonl(i32 305419896)
%3 = trunc i32 %2 to i8
%4 = lshr i32 %2, 8
%5 = trunc i32 %4 to i8
%6 = lshr i32 %2, 16
%7 = trunc i32 %6 to i8
%8 = lshr i32 %2, 24
%9 = trunc i32 %8 to i8
%10 = tail call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8 zeroext %3, i8 zeroext %5, i8 zeroext %7, i8 zeroext %9)
ret i32 0
}