make it build
diff --git a/include/fast_float/digit_comparison.h b/include/fast_float/digit_comparison.h
index 303fff9..0c170b9 100644
--- a/include/fast_float/digit_comparison.h
+++ b/include/fast_float/digit_comparison.h
@@ -72,7 +72,7 @@
binary_format<T>::minimum_exponent();
equiv_uint bits;
#if FASTFLOAT_HAS_BIT_CAST
- bits = std::bit_cast<equiv_uint>(value);
+ bits = bit_cast<equiv_uint>(value);
#else
::memcpy(&bits, &value, sizeof(T));
#endif
diff --git a/include/fast_float/float_common.h b/include/fast_float/float_common.h
index 6c96c9f..fb60416 100644
--- a/include/fast_float/float_common.h
+++ b/include/fast_float/float_common.h
@@ -212,6 +212,89 @@
;
}
+union float_union {
+ float f;
+ uint32_t bits;
+};
+
+union double_union {
+ double f;
+ uint64_t bits;
+};
+
+template <typename T, typename U>
+constexpr T bit_cast(const U &u);
+
+template<>
+fastfloat_really_inline constexpr float bit_cast(const uint32_t &u) {
+ float_union fu;
+ fu.bits = u;
+ return fu.f;
+}
+
+template<>
+fastfloat_really_inline constexpr double bit_cast(const uint64_t &u) {
+ double_union fu;
+ fu.bits = u;
+ return fu.f;
+}
+
+template<>
+fastfloat_really_inline constexpr uint32_t bit_cast(const float &u) {
+ float_union fu;
+ fu.f = u;
+ return fu.bits;
+}
+
+template<>
+fastfloat_really_inline constexpr uint64_t bit_cast(const double &u) {
+ double_union fu;
+ fu.f = u;
+ return fu.bits;
+}
+
+#ifdef __STDCPP_FLOAT16_T__
+union float16_union {
+ std::float16_t f;
+ uint16_t bits;
+};
+
+template<>
+fastfloat_really_inline constexpr uint16_t bit_cast(const std::float16_t &u) {
+ float16_union fu;
+ fu.f = u;
+ return fu.bits;
+}
+
+template<>
+fastfloat_really_inline constexpr std::float16_t bit_cast(const uint16_t &u) {
+ float16_union fu;
+ fu.bits = u;
+ return fu.f;
+}
+#endif // __STDCPP_FLOAT16_T__
+#ifdef __STDCPP_BFLOAT16_T__
+union bfloat16_union {
+ std::bfloat16_t f;
+ uint16_t bits;
+};
+
+template<>
+fastfloat_really_inline constexpr uint16_t bit_cast(const std::bfloat16_t &u) {
+ bfloat16_union fu;
+ fu.f = u;
+ return fu.bits;
+}
+
+template<>
+fastfloat_really_inline constexpr std::bfloat16_t bit_cast(const uint16_t &u) {
+ bfloat16_union fu;
+ fu.bits = u;
+ return fu.f;
+}
+#endif // __STDCPP_BFLOAT16_T__
+
+
template <typename UC>
fastfloat_really_inline constexpr bool is_supported_char_type() {
return std::is_same<UC, char>::value || std::is_same<UC, wchar_t>::value ||
@@ -384,7 +467,7 @@
template <typename T> struct binary_format : binary_format_lookup_tables<T> {
using equiv_uint =
- typename std::conditional<sizeof(T) == 4, uint32_t, uint64_t>::type;
+ typename std::conditional<sizeof(T) == 2, uint16_t, typename std::conditional<sizeof(T) == 4, uint32_t, uint64_t>::type>::type;
static inline constexpr int mantissa_explicit_bits();
static inline constexpr int minimum_exponent();
@@ -566,10 +649,9 @@
// credit: Jakub Jelínek
#ifdef __STDCPP_FLOAT16_T__
-
template <typename U> struct binary_format_lookup_tables<std::float16_t, U> {
- static constexpr std::float16_t powers_of_ten[] = {};
- static constexpr uint64_t max_mantissa[] = {};
+ static constexpr std::float16_t powers_of_ten[] = {1};// todo: fix this
+ static constexpr uint64_t max_mantissa[] = {1};// todo: fix this
};
template <typename U>
@@ -581,6 +663,30 @@
binary_format_lookup_tables<std::float16_t, U>::max_mantissa[];
template <>
+inline constexpr std::float16_t
+binary_format<std::float16_t>::exact_power_of_ten(int64_t power) {
+ return powers_of_ten[power];
+}
+
+template <>
+inline constexpr binary_format<std::float16_t>::equiv_uint
+binary_format<std::float16_t>::exponent_mask() {
+ return 0x7C00;
+}
+
+template <>
+inline constexpr binary_format<std::float16_t>::equiv_uint
+binary_format<std::float16_t>::mantissa_mask() {
+ return 0x03FF;
+}
+
+template <>
+inline constexpr binary_format<std::float16_t>::equiv_uint
+binary_format<std::float16_t>::hidden_bit_mask() {
+ return 0x0400;
+}
+
+template <>
inline constexpr int binary_format<std::float16_t>::max_exponent_fast_path() {
return 0;
}
@@ -592,6 +698,12 @@
}
template <>
+inline constexpr uint64_t
+binary_format<std::float16_t>::max_mantissa_fast_path(int64_t power) {
+ return max_mantissa[power];
+}
+
+template <>
inline constexpr int binary_format<std::float16_t>::min_exponent_fast_path() {
return 0;
}
@@ -640,11 +752,10 @@
// credit: Jakub Jelínek
#ifdef __STDCPP_BFLOAT16_T__
-
template <typename U> struct binary_format_lookup_tables<std::bfloat16_t, U> {
- static constexpr std::bfloat16_t powers_of_ten[] = {};
+ static constexpr std::bfloat16_t powers_of_ten[] = {1};// todo: fix this
- static constexpr uint64_t max_mantissa[] = {};
+ static constexpr uint64_t max_mantissa[] = {1};// todo: fix this
};
template <typename U>
@@ -656,17 +767,47 @@
binary_format_lookup_tables<std::bfloat16_t, U>::max_mantissa[];
template <>
+inline constexpr std::bfloat16_t
+binary_format<std::bfloat16_t>::exact_power_of_ten(int64_t power) {
+ return (void)powers_of_ten[0], powers_of_ten[power];
+}
+
+template <>
inline constexpr int binary_format<std::bfloat16_t>::max_exponent_fast_path() {
return 0;
}
template <>
+inline constexpr binary_format<std::bfloat16_t>::equiv_uint
+binary_format<std::bfloat16_t>::exponent_mask() {
+ return 0x7F80;
+}
+
+template <>
+inline constexpr binary_format<std::bfloat16_t>::equiv_uint
+binary_format<std::bfloat16_t>::mantissa_mask() {
+ return 0x007F;
+}
+
+template <>
+inline constexpr binary_format<std::bfloat16_t>::equiv_uint
+binary_format<std::bfloat16_t>::hidden_bit_mask() {
+ return 0x0080;
+}
+
+template <>
inline constexpr uint64_t
binary_format<std::bfloat16_t>::max_mantissa_fast_path() {
return 0;
}
template <>
+inline constexpr uint64_t
+binary_format<std::bfloat16_t>::max_mantissa_fast_path(int64_t power) {
+ return max_mantissa[power];
+}
+
+template <>
inline constexpr int binary_format<std::bfloat16_t>::min_exponent_fast_path() {
return 0;
}
@@ -818,6 +959,32 @@
::memcpy(&value, &word, sizeof(T));
#endif
}
+#ifdef __STDCPP_FLOAT16_T__
+template<>
+fastfloat_really_inline void
+to_float<std::float16_t>(bool negative, adjusted_mantissa am,
+ std::float16_t &value)
+{
+ constexpr int mantissa_bits
+ = binary_format<std::float16_t>::mantissa_explicit_bits();
+ value = bit_cast<std::float16_t> (uint16_t(am.mantissa
+ | (uint16_t(am.power2) << mantissa_bits)
+ | (negative ? 0x8000 : 0)));
+}
+#endif // __STDCPP_FLOAT16_T__
+#ifdef __STDCPP_BFLOAT16_T__
+template<>
+fastfloat_really_inline void
+to_float<std::bfloat16_t>(bool negative, adjusted_mantissa am,
+ std::bfloat16_t &value)
+{
+ constexpr int mantissa_bits
+ = binary_format<std::bfloat16_t>::mantissa_explicit_bits();
+ value = bit_cast<std::bfloat16_t>(uint16_t(am.mantissa
+ | (uint16_t(am.power2) << mantissa_bits)
+ | (negative ? 0x8000 : 0)));
+}
+#endif // __STDCPP_BFLOAT16_T__
#ifdef FASTFLOAT_SKIP_WHITE_SPACE // disabled by default
template <typename = void> struct space_lut {
@@ -938,6 +1105,21 @@
return int_luts<>::min_safe_u64[base - 2];
}
+
+
+static_assert(std::is_same<binary_format<double>::equiv_uint, uint64_t>::value,
+ "equiv_uint should be uint64_t for double");
+static_assert(std::is_same<binary_format<float>::equiv_uint, uint32_t>::value,
+ "equiv_uint should be uint32_t for float");
+#ifdef __STDCPP_FLOAT16_T__
+static_assert(std::is_same<binary_format<std::float16_t>::equiv_uint, uint16_t>::value,
+ "equiv_uint should be uint16_t for std::float16_t");
+#endif // __STDCPP_FLOAT16_T__
+#ifdef __STDCPP_BFLOAT16_T__
+static_assert(std::is_same<binary_format<std::bfloat16_t>::equiv_uint, uint16_t>::value,
+ "equiv_uint should be uint16_t for std::bfloat16_t");
+#endif // __STDCPP_BFLOAT16_T__
+
} // namespace fast_float
#endif
diff --git a/tests/example_test.cpp b/tests/example_test.cpp
index 6406a2e..03457f3 100644
--- a/tests/example_test.cpp
+++ b/tests/example_test.cpp
@@ -122,6 +122,7 @@
}
std::cout << "parsed the number " << result << std::endl;
#ifdef __STDCPP_FLOAT16_T__
+ printf("16-bit float\n");
// Parse as 16-bit float
std::float16_t parsed_16{};
input = "10000e-1452";
