#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 /*<<< orphan*/ scanf(char *, char *);
int main(void) {
  char character;
  char remainder;
  int sum;
  printf("Enter an abitrarily long string, ending with carriage return > ");
  sum = 0;
  do {
    scanf("%c", &character);
    sum = sum + (int)character;
  } while (character != '\n');
  remainder = (char)(((sum - (int)'\n') % 64) + (int)' ');
  printf("Check sum is %c\n", remainder);
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0xc(%rbp)
lea    0xef5(%rip),%rdi
lea    -0x5(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0xc(%rbp),%eax
movsbl -0x5(%rbp),%ecx
add    %ecx,%eax
mov    %eax,-0xc(%rbp)
movsbl -0x5(%rbp),%eax
cmp    $0xa,%eax
jne    1144 <main+0x24>
mov    -0xc(%rbp),%eax
sub    $0xa,%eax
mov    $0x40,%ecx
cltd
idiv   %ecx
add    $0x20,%edx
mov    %dl,%al
mov    %al,-0x6(%rbp)
movsbl -0x6(%rbp),%esi
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xed0(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf00(%rip),%r14
lea    0xf(%rsp),%r15
cs nopw 0x0(%rax,%rax,1)
nop
mov    %r14,%rdi
mov    %r15,%rsi
call   1040 <scanf@plt>
movsbl 0xf(%rsp),%eax
add    %eax,%ebx
cmp    $0xa,%eax
jne    1150 <main+0x30>
lea    -0xa(%rbx),%eax
lea    0x35(%rbx),%ecx
test   %eax,%eax
cmovns %eax,%ecx
and    $0xffffffc0,%ecx
neg    %ecx
lea    (%rbx,%rcx,1),%esi
add    $0x16,%esi
lea    0xebf(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [64 x i8] c"Enter an abitrarily long string, ending with carriage return > \00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [17 x i8] c"Check sum is %c\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8
%3 = alloca i8
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([64 x i8], [64 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %4
br label %6
6: ; preds = %12, %0
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%8 = load i32, i32* %4
%9 = load i8, i8* %2
%10 = sext i8 %9 to i32
%11 = add nsw i32 %8, %10
store i32 %11, i32* %4
br label %12
12: ; preds = %6
%13 = load i8, i8* %2
%14 = sext i8 %13 to i32
%15 = icmp ne i32 %14, 10
br i1 %15, label %6, label %16
16: ; preds = %12
%17 = load i32, i32* %4
%18 = sub nsw i32 %17, 10
%19 = srem i32 %18, 64
%20 = add nsw i32 %19, 32
%21 = trunc i32 %20 to i8
store i8 %21, i8* %3
%22 = load i8, i8* %3
%23 = sext i8 %22 to i32
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i32 %23)
ret i32 0
}

LLVM IR (-O2):
@.str = [64 x i8] c"Enter an abitrarily long string, ending with carriage return > \00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [17 x i8] c"Check sum is %c\0A\00"
define i32 @main() {
%1 = alloca i8
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([64 x i8], [64 x i8]* @.str, i64 0, i64 0))
br label %3
3: ; preds = %3, %0
%4 = phi i32 [ 0, %0 ], [ %8, %3 ]
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%6 = load i8, i8* %1
%7 = sext i8 %6 to i32
%8 = add nsw i32 %4, %7
%9 = icmp eq i8 %6, 10
br i1 %9, label %10, label %3
10: ; preds = %3
%11 = add nsw i32 %8, -10
%12 = srem i32 %11, 64
%13 = add nsw i32 %12, 32
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i32 %13)
ret i32 0
}