#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 last_bit(unsigned long long);
unsigned long long flip_B2(const unsigned long long discs_player,
                           const unsigned long long discs_opponent) {
  unsigned long long my_discs, opp_discs, r, flipped = 0ULL;
  my_discs = discs_player & 0X0000001008040201ULL;
  opp_discs = (discs_opponent & 0X0000201008040200ULL) | 0X003FDFEFF7FBFC00ULL;
  r = ((my_discs << 9) + opp_discs) & 0X0040000000000000ULL;
  if (r != 0) {
    flipped |= (0X0040000000000000ULL - (0X2ULL << last_bit(my_discs))) &
               0X0000201008040200ULL;
  }
  my_discs = discs_player & 0X0000004040404040ULL;
  opp_discs = (discs_opponent & 0X0000404040404000ULL) | 0X003FBFBFBFBF8000ULL;
  r = ((my_discs << 8) + opp_discs) & 0X0040000000000000ULL;
  if (r != 0) {
    flipped |= (0X0040000000000000ULL - (0X2ULL << last_bit(my_discs))) &
               0X0000404040404000ULL;
  }
  my_discs = discs_player & 0X001F000000000000ULL;
  r = ((my_discs << 1) + discs_opponent) & 0X0040000000000000ULL;
  if (r != 0) {
    flipped |= 0X0040000000000000ULL - (0X2ULL << last_bit(my_discs));
  }
  return flipped;
}


x86 assembly (clang, -O0):
<flip_B2>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movq   $0x0,-0x30(%rbp)
movabs $0x1008040201,%rax
and    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
movabs $0x201008040200,%rax
and    -0x10(%rbp),%rax
movabs $0x3fdfeff7fbfc00,%rcx
or     %rcx,%rax
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rax
shl    $0x9,%rax
add    -0x20(%rbp),%rax
movabs $0x40000000000000,%rcx
and    %rcx,%rax
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
je     11bb <flip_B2+0xab>
mov    -0x18(%rbp),%rdi
call   1030 <last_bit@plt>
mov    %eax,%eax
mov    %eax,%ecx
mov    $0x2,%eax
shl    %cl,%rax
mov    %rax,%rcx
movabs $0x40000000000000,%rax
sub    %rcx,%rax
movabs $0x201008040200,%rcx
and    %rcx,%rax
or     -0x30(%rbp),%rax
mov    %rax,-0x30(%rbp)
movabs $0x4040404040,%rax
and    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
movabs $0x404040404000,%rax
and    -0x10(%rbp),%rax
movabs $0x3fbfbfbfbf8000,%rcx
or     %rcx,%rax
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rax
shl    $0x8,%rax
add    -0x20(%rbp),%rax
movabs $0x40000000000000,%rcx
and    %rcx,%rax
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
je     124e <flip_B2+0x13e>
mov    -0x18(%rbp),%rdi
call   1030 <last_bit@plt>
mov    %eax,%eax
mov    %eax,%ecx
mov    $0x2,%eax
shl    %cl,%rax
mov    %rax,%rcx
movabs $0x40000000000000,%rax
sub    %rcx,%rax
movabs $0x404040404000,%rcx
and    %rcx,%rax
or     -0x30(%rbp),%rax
mov    %rax,-0x30(%rbp)
movabs $0x1f000000000000,%rax
and    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
shl    $0x1,%rax
add    -0x10(%rbp),%rax
movabs $0x40000000000000,%rcx
and    %rcx,%rax
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
je     12b5 <flip_B2+0x1a5>
mov    -0x18(%rbp),%rdi
call   1030 <last_bit@plt>
mov    %eax,%eax
mov    %eax,%ecx
mov    $0x2,%eax
shl    %cl,%rax
mov    %rax,%rcx
movabs $0x40000000000000,%rax
sub    %rcx,%rax
or     -0x30(%rbp),%rax
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<flip_B2>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
mov    %rsi,%r14
mov    %rdi,%rbx
movabs $0x40000000000000,%r12
movabs $0x201008040200,%r13
movabs $0x1008040201,%rdi
and    %rbx,%rdi
mov    %rsi,%rax
and    %r13,%rax
mov    %rdi,%rcx
shl    $0x9,%rcx
add    %rax,%rcx
movabs $0x3fdfeff7fbfc00,%rax
add    %rcx,%rax
bt     $0x36,%rax
jb     1169 <flip_B2+0x59>
xor    %r15d,%r15d
jmp    117d <flip_B2+0x6d>
call   1030 <last_bit@plt>
mov    $0xfffffffffffffffe,%r15
mov    %eax,%ecx
shl    %cl,%r15
and    %r13,%r15
movabs $0x404040404000,%r13
movabs $0x4040404040,%rdi
and    %rbx,%rdi
mov    %r14,%rax
and    %r13,%rax
mov    %rdi,%rcx
shl    $0x8,%rcx
add    %rax,%rcx
movabs $0x3fbfbfbfbf8000,%rax
add    %rcx,%rax
test   %r12,%rax
je     11cd <flip_B2+0xbd>
call   1030 <last_bit@plt>
mov    $0xfffffffffffffffe,%rdx
mov    %eax,%ecx
shl    %cl,%rdx
and    %r13,%rdx
or     %rdx,%r15
movabs $0x1f000000000000,%rax
and    %rax,%rbx
lea    (%r14,%rbx,2),%rax
test   %r12,%rax
je     11fd <flip_B2+0xed>
mov    %rbx,%rdi
call   1030 <last_bit@plt>
mov    $0xfffffffffffffffe,%rdx
mov    %eax,%ecx
shl    %cl,%rdx
add    %r12,%rdx
or     %rdx,%r15
mov    %r15,%rax
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i64 @flip_B2(i64 %0, i64 %1) {
%3 = alloca i64
%4 = alloca i64
%5 = alloca i64
%6 = alloca i64
%7 = alloca i64
%8 = alloca i64
store i64 %0, i64* %3
store i64 %1, i64* %4
store i64 0, i64* %8
%9 = load i64, i64* %3
%10 = and i64 %9, 68853957121
store i64 %10, i64* %5
%11 = load i64, i64* %4
%12 = and i64 %11, 35253226045952
%13 = or i64 %12, 17979145283435520
store i64 %13, i64* %6
%14 = load i64, i64* %5
%15 = shl i64 %14, 9
%16 = load i64, i64* %6
%17 = add i64 %15, %16
%18 = and i64 %17, 18014398509481984
store i64 %18, i64* %7
%19 = load i64, i64* %7
%20 = icmp ne i64 %19, 0
br i1 %20, label %21, label %30
21: ; preds = %2
%22 = load i64, i64* %5
%23 = call i32 @last_bit(i64 %22)
%24 = zext i32 %23 to i64
%25 = shl i64 2, %24
%26 = sub i64 18014398509481984, %25
%27 = and i64 %26, 35253226045952
%28 = load i64, i64* %8
%29 = or i64 %28, %27
store i64 %29, i64* %8
br label %30
30: ; preds = %21, %2
%31 = load i64, i64* %3
%32 = and i64 %31, 275955859520
store i64 %32, i64* %5
%33 = load i64, i64* %4
%34 = and i64 %33, 70644700037120
%35 = or i64 %34, 17943753809428480
store i64 %35, i64* %6
%36 = load i64, i64* %5
%37 = shl i64 %36, 8
%38 = load i64, i64* %6
%39 = add i64 %37, %38
%40 = and i64 %39, 18014398509481984
store i64 %40, i64* %7
%41 = load i64, i64* %7
%42 = icmp ne i64 %41, 0
br i1 %42, label %43, label %52
43: ; preds = %30
%44 = load i64, i64* %5
%45 = call i32 @last_bit(i64 %44)
%46 = zext i32 %45 to i64
%47 = shl i64 2, %46
%48 = sub i64 18014398509481984, %47
%49 = and i64 %48, 70644700037120
%50 = load i64, i64* %8
%51 = or i64 %50, %49
store i64 %51, i64* %8
br label %52
52: ; preds = %43, %30
%53 = load i64, i64* %3
%54 = and i64 %53, 8725724278030336
store i64 %54, i64* %5
%55 = load i64, i64* %5
%56 = shl i64 %55, 1
%57 = load i64, i64* %4
%58 = add i64 %56, %57
%59 = and i64 %58, 18014398509481984
store i64 %59, i64* %7
%60 = load i64, i64* %7
%61 = icmp ne i64 %60, 0
br i1 %61, label %62, label %70
62: ; preds = %52
%63 = load i64, i64* %5
%64 = call i32 @last_bit(i64 %63)
%65 = zext i32 %64 to i64
%66 = shl i64 2, %65
%67 = sub i64 18014398509481984, %66
%68 = load i64, i64* %8
%69 = or i64 %68, %67
store i64 %69, i64* %8
br label %70
70: ; preds = %62, %52
%71 = load i64, i64* %8
ret i64 %71
}

LLVM IR (-O2):
define i64 @flip_B2(i64 %0, i64 %1) {
%3 = and i64 %0, 68853957121
%4 = and i64 %1, 35253226045952
%5 = or i64 %4, 17979145283435520
%6 = shl nuw nsw i64 %3, 9
%7 = add nuw nsw i64 %5, %6
%8 = and i64 %7, 18014398509481984
%9 = icmp eq i64 %8, 0
br i1 %9, label %15, label %10
10: ; preds = %2
%11 = tail call i32 @last_bit(i64 %3)
%12 = zext i32 %11 to i64
%13 = shl i64 -2, %12
%14 = and i64 %13, 35253226045952
br label %15
15: ; preds = %10, %2
%16 = phi i64 [ %14, %10 ], [ 0, %2 ]
%17 = and i64 %0, 275955859520
%18 = and i64 %1, 70644700037120
%19 = or i64 %18, 17943753809428480
%20 = shl nuw nsw i64 %17, 8
%21 = add nuw nsw i64 %19, %20
%22 = and i64 %21, 18014398509481984
%23 = icmp eq i64 %22, 0
br i1 %23, label %30, label %24
24: ; preds = %15
%25 = tail call i32 @last_bit(i64 %17)
%26 = zext i32 %25 to i64
%27 = shl i64 -2, %26
%28 = and i64 %27, 70644700037120
%29 = or i64 %28, %16
br label %30
30: ; preds = %24, %15
%31 = phi i64 [ %29, %24 ], [ %16, %15 ]
%32 = and i64 %0, 8725724278030336
%33 = shl nuw nsw i64 %32, 1
%34 = add i64 %33, %1
%35 = and i64 %34, 18014398509481984
%36 = icmp eq i64 %35, 0
br i1 %36, label %43, label %37
37: ; preds = %30
%38 = tail call i32 @last_bit(i64 %32)
%39 = zext i32 %38 to i64
%40 = shl i64 -2, %39
%41 = add i64 %40, 18014398509481984
%42 = or i64 %41, %31
br label %43
43: ; preds = %37, %30
%44 = phi i64 [ %42, %37 ], [ %31, %30 ]
ret i64 %44
}