#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 /*<<< orphan*/ s;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ swap(int *, int *, int);
int main() {
  int s;
  int a = 3;
  int b = 7;
  printf("a:%d\n", a);
  printf("b:%d\n", b);
  s = sizeof(s);
  swap(&a, &b, s);
  printf("a:%d\n", a);
  printf("b:%d\n", b);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x3,-0x8(%rbp)
movl   $0x7,-0xc(%rbp)
mov    -0x8(%rbp),%esi
lea    0xec0(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%esi
lea    0xeb7(%rip),%rdi
call   1030 <printf@plt>
movl   $0x4,-0x4(%rbp)
mov    -0x4(%rbp),%edx
lea    -0x8(%rbp),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <swap@plt>
mov    -0x8(%rbp),%esi
lea    0xe8b(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%esi
lea    0xe82(%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   $0x3,0x4(%rsp)
movl   $0x7,(%rsp)
lea    0xec6(%rip),%r14
mov    %r14,%rdi
mov    $0x3,%esi
call   1030 <printf@plt>
lea    0xeb8(%rip),%rbx
mov    %rbx,%rdi
mov    $0x7,%esi
call   1030 <printf@plt>
lea    0x4(%rsp),%rdi
mov    %rsp,%rsi
mov    $0x4,%edx
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 = [6 x i8] c"a:%d\0A\00"
@.str.1 = [6 x i8] c"b:%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 3, i32* %2
store i32 7, i32* %3
%4 = load i32, i32* %2
%5 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %4)
%6 = load i32, i32* %3
%7 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %6)
store i32 4, i32* %1
%8 = load i32, i32* %1
%9 = call i32 @swap(i32* %2, i32* %3, i32 %8)
%10 = load i32, i32* %2
%11 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %10)
%12 = load i32, i32* %3
%13 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %12)
ret i32 0
}

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