#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);
int /*<<< orphan*/ swap(int *, int *);
int main(void) {
  int a = 21;
  int b = 42;
  printf("a = %d\n", a);
  printf("b = %d\n", b);
  swap(&a, &b);
  printf("a = %d\n", a);
  printf("b = %d\n", b);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x15,-0x8(%rbp)
movl   $0x2a,-0xc(%rbp)
mov    -0x8(%rbp),%esi
lea    0xeb9(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%esi
lea    0xeb2(%rip),%rdi
call   1030 <printf@plt>
lea    -0x8(%rbp),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <swap@plt>
mov    -0x8(%rbp),%esi
lea    0xe8e(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%esi
lea    0xe87(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
movl   $0x15,0x4(%rsp)
movl   $0x2a,(%rsp)
lea    0xec6(%rip),%r14
mov    %r14,%rdi
mov    $0x15,%esi
call   1030 <printf@plt>
lea    0xeba(%rip),%rbx
mov    %rbx,%rdi
mov    $0x2a,%esi
call   1030 <printf@plt>
lea    0x4(%rsp),%rdi
mov    %rsp,%rsi
call   1040 <swap@plt>
mov    0x4(%rsp),%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    (%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [8 x i8] c"a = %d\0A\00"
@.str.1 = [8 x i8] c"b = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 21, i32* %2
store i32 42, i32* %3
%4 = load i32, i32* %2
%5 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 %4)
%6 = load i32, i32* %3
%7 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32 %6)
%8 = call i32 @swap(i32* %2, i32* %3)
%9 = load i32, i32* %2
%10 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 %9)
%11 = load i32, i32* %3
%12 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32 %11)
ret i32 0
}

LLVM IR (-O2):
@.str = [8 x i8] c"a = %d\0A\00"
@.str.1 = [8 x i8] c"b = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
store i32 21, i32* %1
%4 = bitcast i32* %2 to i8*
store i32 42, i32* %2
%5 = tail call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 21)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32 42)
%7 = call i32 @swap(i32* %1, i32* %2)
%8 = load i32, i32* %1
%9 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = load i32, i32* %2
%11 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32 %10)
ret i32 0
}