#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*/ getchar();
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ swap(int, int);
int /*<<< orphan*/ swap2(int *, int *);
int main() {
  int a = 10, b = 20;
  swap(a, b);
  printf("a=%d, b=%d\n", a, b);
  swap2(&a, &b);
  printf("a=%d, b=%d\n", a, b);
  printf("\nPress any key to end...");
  getchar();
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0xa,-0x8(%rbp)
movl   $0x14,-0xc(%rbp)
mov    -0x8(%rbp),%edi
mov    -0xc(%rbp),%esi
call   1060 <swap@plt>
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xe8b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x8(%rbp),%rdi
lea    -0xc(%rbp),%rsi
call   1050 <swap2@plt>
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xe6a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe68(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x0,%al
call   1040 <getchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
movl   $0xa,0xc(%rsp)
movl   $0x14,0x8(%rsp)
mov    $0xa,%edi
mov    $0x14,%esi
call   1060 <swap@plt>
lea    0xe95(%rip),%rbx
mov    %rbx,%rdi
mov    $0xa,%esi
mov    $0x14,%edx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xc(%rsp),%rdi
lea    0x8(%rsp),%rsi
call   1050 <swap2@plt>
mov    0xc(%rsp),%esi
mov    0x8(%rsp),%edx
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xe65(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [12 x i8] c"a=%d, b=%d\0A\00"
@.str.1 = [25 x i8] c"\0APress any key to end...\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 10, i32* %2
store i32 20, i32* %3
%4 = load i32, i32* %2
%5 = load i32, i32* %3
%6 = call i32 @swap(i32 %4, i32 %5)
%7 = load i32, i32* %2
%8 = load i32, i32* %3
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i32 %7, i32 %8)
%10 = call i32 @swap2(i32* %2, i32* %3)
%11 = load i32, i32* %2
%12 = load i32, i32* %3
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i32 %11, i32 %12)
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.1, i64 0, i64 0))
%15 = call i32 (...) @getchar()
ret i32 0
}

LLVM IR (-O2):
@.str = [12 x i8] c"a=%d, b=%d\0A\00"
@.str.1 = [25 x i8] c"\0APress any key to end...\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
store i32 10, i32* %1
%4 = bitcast i32* %2 to i8*
store i32 20, i32* %2
%5 = tail call i32 @swap(i32 10, i32 20)
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i32 10, i32 20)
%7 = call i32 @swap2(i32* %1, i32* %2)
%8 = load i32, i32* %1
%9 = load i32, i32* %2
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i32 %8, i32 %9)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.1, i64 0, i64 0))
%12 = call i32 (...) @getchar()
ret i32 0
}