#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*/ printf(char *, ...);
int main(void) {
  int x = 'x', y = 'y';
  printf("Before Swap():\n");
  printf("\t"
         "x"
         " = [%c]; "
         "y"
         " = [%c]\n",
         x, y);
  {
    int temporary;
    temporary = x;
    x = y;
    y = temporary;
  };
  printf("Post Swap():\n");
  printf("\t"
         "x"
         " = [%c]; "
         "y"
         " = [%c]\n",
         x, y);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x78,-0x8(%rbp)
movl   $0x79,-0xc(%rbp)
lea    0xecc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xec8(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    -0x10(%rbp),%eax
mov    %eax,-0xc(%rbp)
lea    0xebd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xeed(%rip),%rdi
call   1030 <puts@plt>
lea    0xecc(%rip),%rbx
mov    %rbx,%rdi
mov    $0x78,%esi
mov    $0x79,%edx
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xed5(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x79,%esi
mov    $0x78,%edx
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [16 x i8] c"Before Swap():\0A\00"
@.str.1 = [21 x i8] c"\09x = [%c]; y = [%c]\0A\00"
@.str.2 = [14 x i8] c"Post Swap():\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
store i32 120, i32* %2
store i32 121, i32* %3
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%6 = load i32, i32* %2
%7 = load i32, i32* %3
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 %6, i32 %7)
%9 = load i32, i32* %2
store i32 %9, i32* %4
%10 = load i32, i32* %3
store i32 %10, i32* %2
%11 = load i32, i32* %4
store i32 %11, i32* %3
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0))
%13 = load i32, i32* %2
%14 = load i32, i32* %3
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 %13, i32 %14)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [21 x i8] c"\09x = [%c]; y = [%c]\0A\00"
@str = [15 x i8] c"Before Swap():\00"
@str.3 = [13 x i8] c"Post Swap():\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 120, i32 121)
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @str.3, i64 0, i64 0))
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 121, i32 120)
ret i32 0
}