Remove redundant computations

Author: onalante-ebay

include/xsimd/arch/common/xsimd_common_logical.hpp

@@ -35,15 +35,15 @@ namespace xsimd
         template <class A, class T>
         XSIMD_INLINE size_t countl_zero(batch_bool<T, A> const& self, requires_arch<common>) noexcept
         {
-            constexpr size_t unused_bits = sizeof(uint64_t) * CHAR_BIT - batch_bool<T, A>::size;
+            constexpr size_t unused_bits = 64 - batch_bool<T, A>::size;
             constexpr uint64_t lower_mask = batch_bool<T, A>::size < 64 ? ((uint64_t)1 << batch_bool<T, A>::size) - 1 : (uint64_t)-1;
             return xsimd::detail::countl_zero(self.mask() & lower_mask) - unused_bits;
         }
 
         template <class A, class T>
         XSIMD_INLINE size_t countl_one(batch_bool<T, A> const& self, requires_arch<common>) noexcept
         {
-            constexpr size_t unused_bits = sizeof(uint64_t) * CHAR_BIT - batch_bool<T, A>::size;
+            constexpr size_t unused_bits = 64 - batch_bool<T, A>::size;
             constexpr uint64_t upper_mask = batch_bool<T, A>::size < 64 ? ~(((uint64_t)1 << batch_bool<T, A>::size) - 1) : (uint64_t)0;
             return xsimd::detail::countl_one(self.mask() | upper_mask) - unused_bits;
         }