#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(void) {
  int arr[8], i, p = 1;
  for (i = 0; i < 8; i++) {
    arr[i] = p;
    p *= 2;
  }
  i = 0;
  do {
    printf("%4d", arr[i]);
    i++;
  } while (i < 8);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x1,-0x38(%rbp)
movl   $0x0,-0x34(%rbp)
cmpl   $0x8,-0x34(%rbp)
jge    1159 <main+0x49>
mov    -0x38(%rbp),%ecx
movslq -0x34(%rbp),%rax
mov    %ecx,-0x30(%rbp,%rax,4)
mov    -0x38(%rbp),%eax
shl    $0x1,%eax
mov    %eax,-0x38(%rbp)
mov    -0x34(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x34(%rbp)
jmp    112d <main+0x1d>
movl   $0x0,-0x34(%rbp)
movslq -0x34(%rbp),%rax
mov    -0x30(%rbp,%rax,4),%esi
lea    0xe91(%rip),%rdi
call   1030 <printf@plt>
mov    -0x34(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x34(%rbp)
cmpl   $0x8,-0x34(%rbp)
jl     1160 <main+0x50>
xor    %eax,%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xee8(%rip),%rbx
mov    %rbx,%rdi
mov    $0x1,%esi
call   1030 <printf@plt>
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>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%4d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [8 x i32]
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
store i32 1, i32* %4
store i32 0, i32* %3
br label %5
5: ; preds = %15, %0
%6 = load i32, i32* %3
%7 = icmp slt i32 %6, 8
br i1 %7, label %8, label %18
8: ; preds = %5
%9 = load i32, i32* %4
%10 = load i32, i32* %3
%11 = sext i32 %10 to i64
%12 = getelementptr inbounds [8 x i32], [8 x i32]* %2, i64 0, i64 %11
store i32 %9, i32* %12
%13 = load i32, i32* %4
%14 = mul nsw i32 %13, 2
store i32 %14, i32* %4
br label %15
15: ; preds = %8
%16 = load i32, i32* %3
%17 = add nsw i32 %16, 1
store i32 %17, i32* %3
br label %5
18: ; preds = %5
store i32 0, i32* %3
br label %19
19: ; preds = %27, %18
%20 = load i32, i32* %3
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds [8 x i32], [8 x i32]* %2, i64 0, i64 %21
%23 = load i32, i32* %22
%24 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %23)
%25 = load i32, i32* %3
%26 = add nsw i32 %25, 1
store i32 %26, i32* %3
br label %27
27: ; preds = %19
%28 = load i32, i32* %3
%29 = icmp slt i32 %28, 8
br i1 %29, label %19, label %30
30: ; preds = %27
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%4d\00"
define i32 @main() {
%1 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1)
%2 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2)
%3 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 4)
%4 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 8)
%5 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 16)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 32)
%7 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 64)
%8 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 128)
ret i32 0
}