#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);
scalar_t__ scanf(char *, int *, int *);
int main(int argc, char *argv[]) {
  int i, j;
  while (scanf("%i %i", &i, &j)) {
    if (!i && !j)
      break;
    printf("%i\n", i + j);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xec3(%rip),%rdi
lea    -0x14(%rbp),%rsi
lea    -0x18(%rbp),%rdx
call   1040 <scanf@plt>
cmp    $0x0,%rax
je     1184 <main+0x64>
cmpl   $0x0,-0x14(%rbp)
jne    116d <main+0x4d>
cmpl   $0x0,-0x18(%rbp)
jne    116d <main+0x4d>
jmp    1184 <main+0x64>
mov    -0x14(%rbp),%esi
add    -0x18(%rbp),%esi
lea    0xe8c(%rip),%rdi
call   1030 <printf@plt>
jmp    1136 <main+0x16>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
lea    0xed1(%rip),%rdi
lea    0x4(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
test   %rax,%rax
je     118a <main+0x6a>
lea    0xebe(%rip),%r14
lea    0xeb1(%rip),%r15
lea    0x4(%rsp),%r12
mov    %rsp,%rbx
nopw   0x0(%rax,%rax,1)
mov    0x4(%rsp),%eax
mov    (%rsp),%esi
mov    %eax,%ecx
or     %esi,%ecx
je     118a <main+0x6a>
add    %eax,%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
test   %rax,%rax
jne    1160 <main+0x40>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [6 x i8] c"%i %i\00"
@.str.1 = [4 x i8] c"%i\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
br label %8
8: ; preds = %18, %2
%9 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %6, i32* %7)
%10 = icmp ne i64 %9, 0
br i1 %10, label %11, label %23
11: ; preds = %8
%12 = load i32, i32* %6
%13 = icmp ne i32 %12, 0
br i1 %13, label %18, label %14
14: ; preds = %11
%15 = load i32, i32* %7
%16 = icmp ne i32 %15, 0
br i1 %16, label %18, label %17
17: ; preds = %14
br label %23
18: ; preds = %14, %11
%19 = load i32, i32* %6
%20 = load i32, i32* %7
%21 = add nsw i32 %19, %20
%22 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %21)
br label %8
23: ; preds = %17, %8
ret i32 0
}

LLVM IR (-O2):
@.str = [6 x i8] c"%i %i\00"
@.str.1 = [4 x i8] c"%i\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = alloca i32
%5 = bitcast i32* %3 to i8*
%6 = bitcast i32* %4 to i8*
%7 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %3, i32* %4)
%8 = icmp eq i64 %7, 0
br i1 %8, label %20, label %9
9: ; preds = %2, %15
%10 = load i32, i32* %3
%11 = icmp ne i32 %10, 0
%12 = load i32, i32* %4
%13 = icmp ne i32 %12, 0
%14 = select i1 %11, i1 true, i1 %13
br i1 %14, label %15, label %20
15: ; preds = %9
%16 = add nsw i32 %12, %10
%17 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %16)
%18 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %3, i32* %4)
%19 = icmp eq i64 %18, 0
br i1 %19, label %20, label %9
20: ; preds = %15, %9, %2
ret i32 0
}