#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 const *argv[]) {
  int a, b;
  int f = 0;
  while ((scanf("%d%d", &a, &b) > 0)) {
    printf("%d\n", a + b);
  }
  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)
movl   $0x0,-0x1c(%rbp)
lea    0xebc(%rip),%rdi
lea    -0x14(%rbp),%rsi
lea    -0x18(%rbp),%rdx
call   1040 <scanf@plt>
cmp    $0x0,%rax
jle    1172 <main+0x52>
mov    -0x14(%rbp),%esi
add    -0x18(%rbp),%esi
lea    0xe9d(%rip),%rdi
call   1030 <printf@plt>
jmp    113d <main+0x1d>
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
jle    1182 <main+0x62>
lea    0xebd(%rip),%r14
lea    0xeb1(%rip),%r15
lea    0x4(%rsp),%r12
mov    %rsp,%rbx
nopw   0x0(%rax,%rax,1)
mov    (%rsp),%esi
add    0x4(%rsp),%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
test   %rax,%rax
jg     1160 <main+0x40>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
@.str = [5 x i8] c"%d%d\00"
@.str.1 = [4 x i8] c"%d\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 ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32* %3, i32* %4)
%8 = icmp sgt i64 %7, 0
br i1 %8, label %9, label %16
9: ; preds = %2, %9
%10 = load i32, i32* %3
%11 = load i32, i32* %4
%12 = add nsw i32 %11, %10
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = call i64 @scanf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32* %3, i32* %4)
%15 = icmp sgt i64 %14, 0
br i1 %15, label %9, label %16
16: ; preds = %9, %2
ret i32 0
}