#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 scanf(char *, int *, int *, int *, int *);
int main(void) {
  int c1, c2, c3, c4, scanRes;
  printf("Enter input on the following line\n");
  scanRes = scanf("%c%c%c%c", &c1, &c2, &c3, &c4);
  printf("c1 = %c, c2 = %c, c3 = %c, c4 = %c\n", c1, c2, c3, c4);
  printf("scanRes = %d\n", scanRes);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedf(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
lea    -0x10(%rbp),%rcx
lea    -0x14(%rbp),%r8
call   1040 <scanf@plt>
mov    %eax,-0x18(%rbp)
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
mov    -0x10(%rbp),%ecx
mov    -0x14(%rbp),%r8d
lea    0xebc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%esi
lea    0xecf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeff(%rip),%rdi
call   1030 <puts@plt>
lea    0xeb8(%rip),%rdi
lea    0xc(%rsp),%rsi
lea    0x8(%rsp),%rdx
lea    0x4(%rsp),%rcx
mov    %rsp,%r8
call   1050 <scanf@plt>
mov    %eax,%ebx
mov    0xc(%rsp),%esi
mov    0x8(%rsp),%edx
mov    0x4(%rsp),%ecx
mov    (%rsp),%r8d
lea    0xe91(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xea7(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [35 x i8] c"Enter input on the following line\0A\00"
@.str.1 = [9 x i8] c"%c%c%c%c\00"
@.str.2 = [36 x i8] c"c1 = %c, c2 = %c, c3 = %c, c4 = %c\0A\00"
@.str.3 = [14 x i8] c"scanRes = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %2, i32* %3, i32* %4, i32* %5)
store i32 %8, i32* %6
%9 = load i32, i32* %2
%10 = load i32, i32* %3
%11 = load i32, i32* %4
%12 = load i32, i32* %5
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.2, i64 0, i64 0), i32 %9, i32 %10, i32 %11, i32 %12)
%14 = load i32, i32* %6
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i32 %14)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [9 x i8] c"%c%c%c%c\00"
@.str.2 = [36 x i8] c"c1 = %c, c2 = %c, c3 = %c, c4 = %c\0A\00"
@.str.3 = [14 x i8] c"scanRes = %d\0A\00"
@str = [34 x i8] c"Enter input on the following line\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = bitcast i32* %1 to i8*
%6 = bitcast i32* %2 to i8*
%7 = bitcast i32* %3 to i8*
%8 = bitcast i32* %4 to i8*
%9 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @str, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %1, i32* %2, i32* %3, i32* %4)
%11 = load i32, i32* %1
%12 = load i32, i32* %2
%13 = load i32, i32* %3
%14 = load i32, i32* %4
%15 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([36 x i8], [36 x i8]* @.str.2, i64 0, i64 0), i32 %11, i32 %12, i32 %13, i32 %14)
%16 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i32 %10)
ret i32 0
}