#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*/ by_pointer(int *, int *);
int /*<<< orphan*/ by_value(int, int);
int /*<<< orphan*/ printf(char *, int, int);
int main() {
  int a = 5;
  int b = 7;
  printf("%2d %2d\n", a, b);
  by_value(a, b);
  printf("%2d %2d\n", a, b);
  by_pointer(&a, &b);
  printf("%2d %2d\n", a, b);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x5,-0x4(%rbp)
movl   $0x7,-0x8(%rbp)
mov    -0x4(%rbp),%esi
mov    -0x8(%rbp),%edx
lea    0xead(%rip),%rdi
call   1030 <printf@plt>
mov    -0x4(%rbp),%edi
mov    -0x8(%rbp),%esi
call   1040 <by_value@plt>
mov    -0x4(%rbp),%esi
mov    -0x8(%rbp),%edx
lea    0xe90(%rip),%rdi
call   1030 <printf@plt>
lea    -0x4(%rbp),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <by_pointer@plt>
mov    -0x4(%rbp),%esi
mov    -0x8(%rbp),%edx
lea    0xe71(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
movl   $0x5,0xc(%rsp)
movl   $0x7,0x8(%rsp)
lea    0xeb4(%rip),%rbx
mov    %rbx,%rdi
mov    $0x5,%esi
mov    $0x7,%edx
call   1030 <printf@plt>
mov    $0x5,%edi
mov    $0x7,%esi
call   1040 <by_value@plt>
mov    %rbx,%rdi
mov    $0x5,%esi
mov    $0x7,%edx
call   1030 <printf@plt>
lea    0xc(%rsp),%rdi
lea    0x8(%rsp),%rsi
call   1050 <by_pointer@plt>
mov    0xc(%rsp),%esi
mov    0x8(%rsp),%edx
mov    %rbx,%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

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

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