Fix 64-bit conversion warnings

Author: mborland

include/boost/decimal/decimal32.hpp

@@ -848,7 +848,7 @@ constexpr auto add_impl(T lhs_sig, std::int32_t lhs_exp, bool lhs_sign,
                   << "\nNew neg: " << lhs_sign << std::endl;
         #endif
 
-        return {lhs_sig, lhs_exp, lhs_sign};
+        return {static_cast<std::uint32_t>(lhs_sig), lhs_exp, lhs_sign};
     }
     else if (delta_exp == detail::precision + 1)
     {
@@ -868,7 +868,7 @@ constexpr auto add_impl(T lhs_sig, std::int32_t lhs_exp, bool lhs_sign,
                   << "\nNew neg: " << lhs_sign << std::endl;
         #endif
 
-        return {lhs_sig, lhs_exp, lhs_sign};
+        return {static_cast<std::uint32_t>(lhs_sig), lhs_exp, lhs_sign};
     }
 
     // The two numbers can be added together without special handling
@@ -974,11 +974,11 @@ constexpr auto sub_impl(T lhs_sig, std::int32_t lhs_exp, bool lhs_sign,
 
     if (rhs_sign && !lhs_sign)
     {
-        new_sig = signed_sig_lhs + signed_sig_rhs;
+        new_sig = static_cast<std::int32_t>(signed_sig_lhs) + static_cast<std::int32_t>(signed_sig_rhs);
     }
     else
     {
-        new_sig = signed_sig_lhs - signed_sig_rhs;
+        new_sig = static_cast<std::int32_t>(signed_sig_lhs) - static_cast<std::int32_t>(signed_sig_rhs);
     }
 
     const auto new_exp {abs_lhs_bigger ? lhs_exp : rhs_exp};

include/boost/decimal/decimal32_fast.hpp

@@ -508,8 +508,8 @@ constexpr auto div_impl(decimal32_fast lhs, decimal32_fast rhs, decimal32_fast&
               << "\nexp rhs: " << exp_rhs << std::endl;
     #endif
 
-    detail::decimal32_components lhs_components {sig_lhs, exp_lhs, lhs.isneg()};
-    detail::decimal32_components rhs_components {sig_rhs, exp_rhs, rhs.isneg()};
+    detail::decimal32_components lhs_components {static_cast<std::uint32_t>(sig_lhs), exp_lhs, lhs.isneg()};
+    detail::decimal32_components rhs_components {static_cast<std::uint32_t>(sig_rhs), exp_rhs, rhs.isneg()};
     detail::decimal32_components q_components {};
 
     generic_div_impl(lhs_components, rhs_components, q_components);