#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);
int main() {
  int i;
  int j = 1;
  for (i = 1; i < 21; i++) {
    j = j * 2;
    printf("2^%d=\t%d\n", i, j);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x1,-0xc(%rbp)
movl   $0x1,-0x8(%rbp)
cmpl   $0x15,-0x8(%rbp)
jge    1160 <main+0x50>
mov    -0xc(%rbp),%eax
shl    $0x1,%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xeb3(%rip),%rdi
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    112d <main+0x1d>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xee8(%rip),%rbx
mov    %rbx,%rdi
mov    $0x1,%esi
mov    $0x2,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x2,%esi
mov    $0x4,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x3,%esi
mov    $0x8,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x4,%esi
mov    $0x10,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x5,%esi
mov    $0x20,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6,%esi
mov    $0x40,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x7,%esi
mov    $0x80,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x8,%esi
mov    $0x100,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x9,%esi
mov    $0x200,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xa,%esi
mov    $0x400,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xb,%esi
mov    $0x800,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xc,%esi
mov    $0x1000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xd,%esi
mov    $0x2000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xe,%esi
mov    $0x4000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0xf,%esi
mov    $0x8000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x10,%esi
mov    $0x10000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x11,%esi
mov    $0x20000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x12,%esi
mov    $0x40000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x13,%esi
mov    $0x80000,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x14,%esi
mov    $0x100000,%edx
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [10 x i8] c"2^%d=\09%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 1, i32* %3
store i32 1, i32* %2
br label %4
4: ; preds = %13, %0
%5 = load i32, i32* %2
%6 = icmp slt i32 %5, 21
br i1 %6, label %7, label %16
7: ; preds = %4
%8 = load i32, i32* %3
%9 = mul nsw i32 %8, 2
store i32 %9, i32* %3
%10 = load i32, i32* %2
%11 = load i32, i32* %3
%12 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 %10, i32 %11)
br label %13
13: ; preds = %7
%14 = load i32, i32* %2
%15 = add nsw i32 %14, 1
store i32 %15, i32* %2
br label %4
16: ; preds = %4
%17 = load i32, i32* %1
ret i32 %17
}

LLVM IR (-O2):
@.str = [10 x i8] c"2^%d=\09%d\0A\00"
define i32 @main() {
%1 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 1, i32 2)
%2 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 2, i32 4)
%3 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 3, i32 8)
%4 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 4, i32 16)
%5 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 5, i32 32)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 6, i32 64)
%7 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 7, i32 128)
%8 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 8, i32 256)
%9 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 9, i32 512)
%10 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 10, i32 1024)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 11, i32 2048)
%12 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 12, i32 4096)
%13 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 13, i32 8192)
%14 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 14, i32 16384)
%15 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 15, i32 32768)
%16 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 16, i32 65536)
%17 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 17, i32 131072)
%18 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 18, i32 262144)
%19 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 19, i32 524288)
%20 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 20, i32 1048576)
ret i32 0
}