#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() {
  char stuff;
  int sum = 0;
  printf("Enter an abitrarily long string, ending with carriage return > ");
  scanf("%c", &stuff);
  while (stuff != '\n') {
    sum += (int)stuff;
    scanf("%c", &stuff);
  }
  sum = sum % 64 + (int)' ';
  printf("Check sum is %c\n", (char)sum);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef5(%rip),%rdi
lea    -0x5(%rbp),%rsi
call   1040 <scanf@plt>
movsbl -0x5(%rbp),%eax
cmp    $0xa,%eax
je     1180 <main+0x60>
movsbl -0x5(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
lea    0xece(%rip),%rdi
lea    -0x5(%rbp),%rsi
call   1040 <scanf@plt>
jmp    1154 <main+0x34>
mov    -0xc(%rbp),%eax
mov    $0x40,%ecx
cltd
idiv   %ecx
add    $0x20,%edx
mov    %edx,-0xc(%rbp)
mov    -0xc(%rbp),%eax
movsbl %al,%esi
lea    0xea5(%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),%rdi
lea    0xf(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xf(%rsp),%al
mov    $0x20,%esi
cmp    $0xa,%al
je     119c <main+0x7c>
lea    0xee2(%rip),%r14
lea    0xf(%rsp),%r15
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movsbl %al,%eax
add    %eax,%ebx
mov    %r14,%rdi
mov    %r15,%rsi
call   1040 <scanf@plt>
movzbl 0xf(%rsp),%eax
cmp    $0xa,%al
jne    1170 <main+0x50>
lea    0x3f(%rbx),%eax
test   %ebx,%ebx
cmovns %ebx,%eax
and    $0xffffffc0,%eax
neg    %eax
lea    (%rbx,%rax,1),%esi
add    $0x20,%esi
lea    0xea0(%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 i32
store i32 0, i32* %1
store i32 0, i32* %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([64 x i8], [64 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
br label %6
6: ; preds = %10, %0
%7 = load i8, i8* %2
%8 = sext i8 %7 to i32
%9 = icmp ne i32 %8, 10
br i1 %9, label %10, label %16
10: ; preds = %6
%11 = load i8, i8* %2
%12 = sext i8 %11 to i32
%13 = load i32, i32* %3
%14 = add nsw i32 %13, %12
store i32 %14, i32* %3
%15 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
br label %6
16: ; preds = %6
%17 = load i32, i32* %3
%18 = srem i32 %17, 64
%19 = add nsw i32 %18, 32
store i32 %19, i32* %3
%20 = load i32, i32* %3
%21 = trunc i32 %20 to i8
%22 = sext i8 %21 to i32
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i32 %22)
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))
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%4 = load i8, i8* %1
%5 = icmp eq i8 %4, 10
br i1 %5, label %17, label %6
6: ; preds = %0, %6
%7 = phi i8 [ %12, %6 ], [ %4, %0 ]
%8 = phi i32 [ %10, %6 ], [ 0, %0 ]
%9 = sext i8 %7 to i32
%10 = add nsw i32 %8, %9
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%12 = load i8, i8* %1
%13 = icmp eq i8 %12, 10
br i1 %13, label %14, label %6
14: ; preds = %6
%15 = srem i32 %10, 64
%16 = add nsw i32 %15, 32
br label %17
17: ; preds = %14, %0
%18 = phi i32 [ 32, %0 ], [ %16, %14 ]
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i32 %18)
ret i32 0
}