#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 bitcount(unsigned int);
int /*<<< orphan*/ printf(char *, int);
main() {
  printf("%d\n", bitcount(255));
  printf("%d\n", bitcount(15));
  printf("%d\n", bitcount(1));
  printf("%d\n", bitcount(0));
  printf("%d\n", bitcount(~0U));
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
mov    $0xff,%edi
call   1040 <bitcount@plt>
mov    %eax,%esi
lea    0xec9(%rip),%rdi
call   1030 <printf@plt>
mov    $0xf,%edi
call   1040 <bitcount@plt>
mov    %eax,%esi
lea    0xeb1(%rip),%rdi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1040 <bitcount@plt>
mov    %eax,%esi
lea    0xe99(%rip),%rdi
call   1030 <printf@plt>
xor    %edi,%edi
call   1040 <bitcount@plt>
mov    %eax,%esi
lea    0xe84(%rip),%rdi
call   1030 <printf@plt>
mov    $0xffffffff,%edi
call   1040 <bitcount@plt>
mov    %eax,%esi
lea    0xe6c(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    $0xff,%edi
call   1040 <bitcount@plt>
lea    0xece(%rip),%rbx
mov    %rbx,%rdi
mov    %eax,%esi
call   1030 <printf@plt>
mov    $0xf,%edi
call   1040 <bitcount@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1040 <bitcount@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1030 <printf@plt>
xor    %edi,%edi
call   1040 <bitcount@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1030 <printf@plt>
mov    $0xffffffff,%edi
call   1040 <bitcount@plt>
mov    %rbx,%rdi
mov    %eax,%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 = call i32 @bitcount(i32 255)
%2 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %1)
%3 = call i32 @bitcount(i32 15)
%4 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %3)
%5 = call i32 @bitcount(i32 1)
%6 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = call i32 @bitcount(i32 0)
%8 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %7)
%9 = call i32 @bitcount(i32 -1)
%10 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %9)
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = tail call i32 @bitcount(i32 255)
%2 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %1)
%3 = tail call i32 @bitcount(i32 15)
%4 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %3)
%5 = tail call i32 @bitcount(i32 1)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = tail call i32 @bitcount(i32 0)
%8 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %7)
%9 = tail call i32 @bitcount(i32 -1)
%10 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %9)
ret i32 0
}