Enable _umul128 optimisation only on x86-64 on MSVC

chfast · Jan 24, 2023 · 24daa0a · 24daa0a
1 parent ac65055
commit 24daa0a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/include/intx/intx.hpp b/include/intx/intx.hpp
@@ -440,7 +440,7 @@ inline constexpr uint128 umul(uint64_t x, uint64_t y) noexcept
 {
 #if INTX_HAS_BUILTIN_INT128
     return builtin_uint128{x} * builtin_uint128{y};
-#elif defined(_MSC_VER) && _MSC_VER >= 1925
+#elif defined(_MSC_VER) && _MSC_VER >= 1925 && defined(_M_X64)
     if (!is_constant_evaluated())
     {
         unsigned __int64 hi = 0;