#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);
int main() {
  int i, a;
  i = 1;
  while (i <= 1000000000) {
    a = i * 2;
    i = i * 2;
    printf("%d\n", a);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x1,-0x8(%rbp)
cmpl   $0x3b9aca00,-0x8(%rbp)
jg     1159 <main+0x49>
mov    -0x8(%rbp),%eax
shl    $0x1,%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
shl    $0x1,%eax
mov    %eax,-0x8(%rbp)
mov    -0xc(%rbp),%esi
lea    0xeb1(%rip),%rdi
call   1030 <printf@plt>
jmp    1126 <main+0x16>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xee8(%rip),%rbx
mov    %rbx,%rdi
mov    $0x2,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x4,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x8,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x10,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x20,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x40,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x80,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x100,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x200,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x400,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x800,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x1000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x2000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x4000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x8000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x10000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x20000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x40000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x80000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x100000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x200000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x400000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x800000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x1000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x2000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x4000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x8000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x10000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x20000000,%esi
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x40000000,%esi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 1, i32* %2
br label %4
4: ; preds = %7, %0
%5 = load i32, i32* %2
%6 = icmp sle i32 %5, 1000000000
br i1 %6, label %7, label %14
7: ; preds = %4
%8 = load i32, i32* %2
%9 = mul nsw i32 %8, 2
store i32 %9, i32* %3
%10 = load i32, i32* %2
%11 = mul nsw i32 %10, 2
store i32 %11, i32* %2
%12 = load i32, i32* %3
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %12)
br label %4
14: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2)
%2 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 4)
%3 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 8)
%4 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 16)
%5 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 32)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 64)
%7 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 128)
%8 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 256)
%9 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 512)
%10 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1024)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2048)
%12 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 4096)
%13 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 8192)
%14 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 16384)
%15 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 32768)
%16 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 65536)
%17 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 131072)
%18 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 262144)
%19 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 524288)
%20 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1048576)
%21 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2097152)
%22 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 4194304)
%23 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 8388608)
%24 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 16777216)
%25 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 33554432)
%26 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 67108864)
%27 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 134217728)
%28 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 268435456)
%29 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 536870912)
%30 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1073741824)
ret i32 0
}