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Always run grisu_gen_digits before fallback_format

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This commit is contained in:
Victor Zverovich 2021-09-26 07:54:25 -07:00
parent 2976e31ac9
commit ff7e73af66
2 changed files with 8 additions and 10 deletions
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8
include/fmt/format-inl.h
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@ -2326,9 +2326,9 @@ FMT_CONSTEXPR20 void fallback_format(Float n, int num_digits, bool binary32,
// Generate the given number of digits.
exp10 -= num_digits - 1;
if (num_digits == 0) {
buf.try_resize(1);
denominator *= 10;
buf[0] = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
auto digit = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
buf.push_back(digit);
return;
}
buf.try_resize(to_unsigned(num_digits));
@ -2407,8 +2407,8 @@ FMT_HEADER_ONLY_CONSTEXPR20 int format_float(T value, int precision,
const int max_double_digits = 767;
if (precision > max_double_digits) precision = max_double_digits;
fixed_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
if (!is_constant_evaluated() &&
grisu_gen_digits(normalized, 1, exp, handler) != digits::error) {
if (grisu_gen_digits(normalized, 1, exp, handler) != digits::error &&
!is_constant_evaluated()) {
exp += handler.exp10;
buf.try_resize(to_unsigned(handler.size));
fallback = false;

4
test/compile-fp-test.cc
View File

@ -11,9 +11,7 @@
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806 && \
defined(__cpp_constexpr) && __cpp_constexpr >= 201907 && \
defined(__cpp_constexpr_dynamic_alloc) && \
__cpp_constexpr_dynamic_alloc >= 201907 && __cplusplus >= 202002L && \
!FMT_MSC_VER && \
!FMT_GCC_VERSION // MSVC & GCC constexpr limits are too low.
__cpp_constexpr_dynamic_alloc >= 201907 && __cplusplus >= 202002L
template <size_t max_string_length, typename Char = char> struct test_string {
template <typename T> constexpr bool operator==(const T& rhs) const noexcept {
return fmt::basic_string_view<Char>(rhs).compare(buffer) == 0;