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Simplify float_info

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This commit is contained in:
Victor Zverovich
2022-03-14 13:15:30 -07:00
parent f91f61cd13
commit 72f487562d
3 changed files with 18 additions and 31 deletions
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15
include/fmt/format-inl.h
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@@ -1788,11 +1788,10 @@ template <> struct cache_accessor<double> {
// Various integer checks
template <class T>
bool is_left_endpoint_integer_shorter_interval(int exponent) noexcept {
return exponent >=
float_info<
T>::case_shorter_interval_left_endpoint_lower_threshold &&
exponent <=
float_info<T>::case_shorter_interval_left_endpoint_upper_threshold;
const int case_shorter_interval_left_endpoint_lower_threshold = 2;
const int case_shorter_interval_left_endpoint_upper_threshold = 3;
return exponent >= case_shorter_interval_left_endpoint_lower_threshold &&
exponent <= case_shorter_interval_left_endpoint_upper_threshold;
}
// Remove trailing zeros from n and return the number of zeros removed (float)
@@ -1933,7 +1932,8 @@ template <typename T> decimal_fp<T> to_decimal(T x) noexcept {
static_cast<int>((br & exponent_mask<T>()) >> num_significand_bits<T>());
if (exponent != 0) { // Check if normal.
exponent += float_info<T>::exponent_bias - num_significand_bits<T>();
const int exponent_bias = std::numeric_limits<T>::max_exponent - 1;
exponent -= exponent_bias + num_significand_bits<T>();
// Shorter interval case; proceed like Schubfach.
// In fact, when exponent == 1 and significand == 0, the interval is
@@ -1944,7 +1944,8 @@ template <typename T> decimal_fp<T> to_decimal(T x) noexcept {
} else {
// Subnormal case; the interval is always regular.
if (significand == 0) return {0, 0};
exponent = float_info<T>::min_exponent - num_significand_bits<T>();
exponent =
std::numeric_limits<T>::min_exponent - num_significand_bits<T>() - 1;
}
const bool include_left_endpoint = (significand % 2 == 0);