diff --git a/include/duckhandy/implem/int_conv.hpp b/include/duckhandy/implem/int_conv.hpp
index 9d941c6..7285b57 100644
--- a/include/duckhandy/implem/int_conv.hpp
+++ b/include/duckhandy/implem/int_conv.hpp
@@ -23,6 +23,7 @@
 #include <sprout/math/abs.hpp>
 #include <sprout/math/ceil.hpp>
 #include <cstddef>
+#include <cstdint>
 #include <array>
 #include <limits>
 #include <emmintrin.h>
@@ -176,6 +177,8 @@ namespace dhandy {
 
 		template <typename I, unsigned int Base, typename Tr, bool Constexpr, typename=void>
 		struct AryConversion {
+			constexpr static const bool is_sse = false;
+
 			template <typename C>
 			constexpr static I from_ary (const C* beg, const C* end) {
 				I retval = 0;
@@ -196,12 +199,14 @@ namespace dhandy {
 		};
 
 		template <typename I, unsigned int Base, typename Tr>
-		struct AryConversion<I, Base, Tr, false, typename std::enable_if<Tr::BehavesLikeASCII and std::is_integral<I>::value and not std::is_same<I, bool>::value and sizeof(I) <= sizeof(uint32_t)>::type> {
+		struct AryConversion<I, Base, Tr, false, typename std::enable_if<Tr::BehavesLikeASCII and std::is_integral<I>::value and not std::is_same<I, bool>::value and sizeof(I) <= sizeof(std::uint32_t)>::type> {
+			constexpr static const bool is_sse = true;
 			template <typename C> static I from_ary (C* beg, C* end) { return to_integer_sse<I, C, Base, Tr>(beg, end - beg); }
 		};
 
 		template <unsigned int Base, typename Tr, bool Constexpr>
 		struct AryConversion<bool, Base, Tr, Constexpr> {
+			constexpr static const bool is_sse = false;
 			template <typename C> constexpr static bool from_ary (C* beg, C* end) {
 				if (end == beg)
 					return false;
diff --git a/test/unit/int_conv_test.cpp b/test/unit/int_conv_test.cpp
index eed46a1..7d1055b 100644
--- a/test/unit/int_conv_test.cpp
+++ b/test/unit/int_conv_test.cpp
@@ -30,14 +30,16 @@ template <typename T> using int_info_2 = dhandy::implem::int_info<T, 2>;
 
 namespace {
 	template <typename T, unsigned int Base>
-	void AryConversionTestHelper (const std::string_view& s, T expected) {
+	void AryConversionTestHelper (const std::string_view& s, T expected, bool expect_sse) {
 		using AryConversion = dhandy::implem::AryConversion<T, Base, dhandy::ASCIITranslator<char>, false>;
+		CHECK(AryConversion::is_sse == expect_sse);
 		CHECK(AryConversion::from_ary(s.data(), s.data() + s.size()) == expected);
 	}
 
 	template <typename T, unsigned int Base>
-	void AryConversionTestHelperUp (const std::string_view& s, T expected) {
+	void AryConversionTestHelperUp (const std::string_view& s, T expected, bool expect_sse) {
 		using AryConversion = dhandy::implem::AryConversion<T, Base, dhandy::ASCIITranslatorUpcase<char>, false>;
+		CHECK(AryConversion::is_sse == expect_sse);
 		CHECK(AryConversion::from_ary(s.data(), s.data() + s.size()) == expected);
 	}
 } //unnamed namespace
@@ -137,35 +139,35 @@ TEST_CASE ("Check int to char array conversions", "[s2i][int_conv]") {
 }
 
 TEST_CASE ("Check char array to int conversions", "[i2s][int_conv]") {
-	AryConversionTestHelper<uint32_t, 10>("0", 0);
-	AryConversionTestHelper<int32_t, 10>("0", 0);
-	AryConversionTestHelper<int16_t, 10>("0", 0);
-	AryConversionTestHelper<int16_t, 16>("ff", 0xff);
-	AryConversionTestHelper<uint8_t, 16>("ff", 0xff);
-	AryConversionTestHelper<uint32_t, 36>("rs", 1000);
-	AryConversionTestHelper<uint16_t, 8>("20", 16);
-	AryConversionTestHelper<int32_t, 10>("1", 1);
-	AryConversionTestHelper<int32_t, 10>("10", 10);
-	AryConversionTestHelper<int32_t, 10>("100", 100);
-	AryConversionTestHelper<int32_t, 10>("999", 999);
-	AryConversionTestHelper<int32_t, 10>("1000", 1000);
-	AryConversionTestHelper<int32_t, 10>("1001", 1001);
-	AryConversionTestHelper<int32_t, 10>("12345", 12345);
-	AryConversionTestHelper<int32_t, 10>("123456", 123456);
-	AryConversionTestHelper<int32_t, 10>("1234567", 1234567);
-	AryConversionTestHelper<int32_t, 10>("12345678", 12345678);
-	AryConversionTestHelper<int32_t, 10>("123456789", 123456789);
-	AryConversionTestHelper<int32_t, 10>("2147483647", 2147483647);
-	AryConversionTestHelper<uint64_t, 16>("ffffffffffffffff", 0xffffffffffffffff);
-	AryConversionTestHelper<int64_t, 16>("ffffffffffffffff", 0xffffffffffffffff);
-	AryConversionTestHelper<int64_t, 16>("7fffffffffffffff", 0x7fffffffffffffff);
-	AryConversionTestHelper<int32_t, 16>("7fffffff", 0x7fffffff);
-	AryConversionTestHelper<bool, 10>("1", true);
-	AryConversionTestHelper<bool, 10>("0", false);
-	AryConversionTestHelperUp<uint64_t, 16>("ABCDEF123456ABCD", 0xabcdef123456abcd);
+	AryConversionTestHelper<std::uint32_t, 10>("0", 0, true);
+	AryConversionTestHelper<std::int32_t, 10>("0", 0, true);
+	AryConversionTestHelper<std::int16_t, 10>("0", 0, true);
+	AryConversionTestHelper<std::int16_t, 16>("ff", 0xff, true);
+	AryConversionTestHelper<std::uint8_t, 16>("ff", 0xff, true);
+	AryConversionTestHelper<std::uint32_t, 36>("rs", 1000, true);
+	AryConversionTestHelper<std::uint16_t, 8>("20", 16, true);
+	AryConversionTestHelper<std::int32_t, 10>("1", 1, true);
+	AryConversionTestHelper<std::int32_t, 10>("10", 10, true);
+	AryConversionTestHelper<std::int32_t, 10>("100", 100, true);
+	AryConversionTestHelper<std::int32_t, 10>("999", 999, true);
+	AryConversionTestHelper<std::int32_t, 10>("1000", 1000, true);
+	AryConversionTestHelper<std::int32_t, 10>("1001", 1001, true);
+	AryConversionTestHelper<std::int32_t, 10>("12345", 12345, true);
+	AryConversionTestHelper<std::int32_t, 10>("123456", 123456, true);
+	AryConversionTestHelper<std::int32_t, 10>("1234567", 1234567, true);
+	AryConversionTestHelper<std::int32_t, 10>("12345678", 12345678, true);
+	AryConversionTestHelper<std::int32_t, 10>("123456789", 123456789, true);
+	AryConversionTestHelper<std::int32_t, 10>("2147483647", 2147483647, true);
+	AryConversionTestHelper<std::uint64_t, 16>("ffffffffffffffff", 0xffffffffffffffff, false);
+	AryConversionTestHelper<std::int64_t, 16>("ffffffffffffffff", 0xffffffffffffffff, false);
+	AryConversionTestHelper<std::int64_t, 16>("7fffffffffffffff", 0x7fffffffffffffff, false);
+	AryConversionTestHelper<std::int32_t, 16>("7fffffff", 0x7fffffff, true);
+	AryConversionTestHelper<bool, 10>("1", true, false);
+	AryConversionTestHelper<bool, 10>("0", false, false);
+	AryConversionTestHelperUp<std::uint64_t, 16>("ABCDEF123456ABCD", 0xabcdef123456abcd, false);
 
-	AryConversionTestHelper<signed int, 10>("-1", -1);
-	AryConversionTestHelper<signed int, 10>("-50000", -50000);
-	AryConversionTestHelper<int64_t, 10>("-1", -1);
-	AryConversionTestHelper<int64_t, 10>("-510123123123", -510123123123);
+	AryConversionTestHelper<signed int, 10>("-1", -1, sizeof(signed int) <= sizeof(std::uint32_t));
+	AryConversionTestHelper<signed int, 10>("-50000", -50000, sizeof(signed int) <= sizeof(std::uint32_t));
+	AryConversionTestHelper<std::int64_t, 10>("-1", -1, false);
+	AryConversionTestHelper<std::int64_t, 10>("-510123123123", -510123123123, false);
 }