#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 */
scalar_t__ pow(int, int);
int /*<<< orphan*/ printf(char *, int, int);
int main() {
  int i;
  for (i = 1; i <= 20; i++) {
    printf("2 ^%d: %d\n", i, (int)pow(2, i));
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x1,-0x8(%rbp)
cmpl   $0x14,-0x8(%rbp)
jg     1172 <main+0x52>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%esi
mov    $0x2,%edi
call   1040 <pow@plt>
mov    -0xc(%rbp),%esi
mov    %eax,%edx
lea    0xea1(%rip),%rdi
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1136 <main+0x16>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    $0x2,%edi
mov    $0x1,%esi
call   1040 <pow@plt>
lea    0xec9(%rip),%rbx
mov    %rbx,%rdi
mov    $0x1,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x2,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x2,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x3,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x3,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x4,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x4,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x5,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x5,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x6,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x6,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x7,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x7,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x8,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x8,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x9,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x9,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xa,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xa,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xb,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xb,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xc,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xc,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xd,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xd,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xe,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xe,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0xf,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0xf,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x10,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x10,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x11,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x11,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x12,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x12,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x13,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x13,%esi
mov    %eax,%edx
call   1030 <printf@plt>
mov    $0x2,%edi
mov    $0x14,%esi
call   1040 <pow@plt>
mov    %rbx,%rdi
mov    $0x14,%esi
mov    %eax,%edx
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

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

LLVM IR (-O2):
@.str = [11 x i8] c"2 ^%d: %d\0A\00"
define i32 @main() {
%1 = tail call i64 @pow(i32 2, i32 1)
%2 = trunc i64 %1 to i32
%3 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 1, i32 %2)
%4 = tail call i64 @pow(i32 2, i32 2)
%5 = trunc i64 %4 to i32
%6 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 2, i32 %5)
%7 = tail call i64 @pow(i32 2, i32 3)
%8 = trunc i64 %7 to i32
%9 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 3, i32 %8)
%10 = tail call i64 @pow(i32 2, i32 4)
%11 = trunc i64 %10 to i32
%12 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 4, i32 %11)
%13 = tail call i64 @pow(i32 2, i32 5)
%14 = trunc i64 %13 to i32
%15 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 5, i32 %14)
%16 = tail call i64 @pow(i32 2, i32 6)
%17 = trunc i64 %16 to i32
%18 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 6, i32 %17)
%19 = tail call i64 @pow(i32 2, i32 7)
%20 = trunc i64 %19 to i32
%21 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 7, i32 %20)
%22 = tail call i64 @pow(i32 2, i32 8)
%23 = trunc i64 %22 to i32
%24 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 8, i32 %23)
%25 = tail call i64 @pow(i32 2, i32 9)
%26 = trunc i64 %25 to i32
%27 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 9, i32 %26)
%28 = tail call i64 @pow(i32 2, i32 10)
%29 = trunc i64 %28 to i32
%30 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 10, i32 %29)
%31 = tail call i64 @pow(i32 2, i32 11)
%32 = trunc i64 %31 to i32
%33 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 11, i32 %32)
%34 = tail call i64 @pow(i32 2, i32 12)
%35 = trunc i64 %34 to i32
%36 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 12, i32 %35)
%37 = tail call i64 @pow(i32 2, i32 13)
%38 = trunc i64 %37 to i32
%39 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 13, i32 %38)
%40 = tail call i64 @pow(i32 2, i32 14)
%41 = trunc i64 %40 to i32
%42 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 14, i32 %41)
%43 = tail call i64 @pow(i32 2, i32 15)
%44 = trunc i64 %43 to i32
%45 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 15, i32 %44)
%46 = tail call i64 @pow(i32 2, i32 16)
%47 = trunc i64 %46 to i32
%48 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 16, i32 %47)
%49 = tail call i64 @pow(i32 2, i32 17)
%50 = trunc i64 %49 to i32
%51 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 17, i32 %50)
%52 = tail call i64 @pow(i32 2, i32 18)
%53 = trunc i64 %52 to i32
%54 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 18, i32 %53)
%55 = tail call i64 @pow(i32 2, i32 19)
%56 = trunc i64 %55 to i32
%57 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 19, i32 %56)
%58 = tail call i64 @pow(i32 2, i32 20)
%59 = trunc i64 %58 to i32
%60 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 20, i32 %59)
ret i32 0
}