`isfinite` declared `constexpr` for c++20 #3745

hchataing · 2023-12-08T22:52:56Z

std::isfinite is not declared constexpr before c++23, but fmt::isfinite is declared constexpr for c++20
(https://en.cppreference.com/w/cpp/numeric/math/isfinite).

https://github.com/fmtlib/fmt/blob/master/include/fmt/core.h#L108:

#if ((FMT_CPLUSPLUS >= 202002L) &&                            \
     (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \
    (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)
#  define FMT_CONSTEXPR20 constexpr
#else
#  define FMT_CONSTEXPR20
#endif

https://github.com/fmtlib/fmt/blob/master/include/fmt/format.h#L2753:

template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value&&
                                        has_isfinite<T>::value)>
FMT_CONSTEXPR20 bool isfinite(T value) {
  constexpr T inf = T(std::numeric_limits<double>::infinity());
  if (is_constant_evaluated())
    return !detail::isnan(value) && value < inf && value > -inf;
  return std::isfinite(value);
}

Resulting compilation error:

external/fmtlib/test/format-test.cc:94:24: error: constexpr variable 'result' must be initialized by a constant expression
  FMT_CONSTEXPR20 auto result = isfinite(Float(limits::infinity()));
                       ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
external/fmtlib/test/format-test.cc:103:3: note: in instantiation of function template specialization 'check_isfinite<double>' requested here
  check_isfinite<double>();
  ^
external/fmtlib/include/fmt/format.h:2751:10: note: non-constexpr function 'isfinite<double>' cannot be used in a constant expression
  return std::isfinite(value);
         ^
external/fmtlib/test/format-test.cc:94:33: note: in call to 'isfinite(INF)'
  FMT_CONSTEXPR20 auto result = isfinite(Float(limits::infinity()));
                                ^
external/libcxx/include/math.h:439:1: note: declared here
isfinite(_A1 __lcpp_x) _NOEXCEPT
^
1 error generated.
22:46:14 ninja failed with: exit status 1

Compiler version (Android 🤷 )

Android (11039501, +pgo, +bolt, +lto, +mlgo, based on r498229b) clang version 17.0.4 (https://android.googlesource.com/toolchain/llvm-project e34ed7d63863b45858e74126edaa738e75887800)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/google/home/henrichataing/Projects/android/aosp-master/prebuilts/clang/host/linux-x86/clang-r498229b/bin

The text was updated successfully, but these errors were encountered:

hchataing · 2023-12-08T23:08:27Z

Locally fixed by defining

#if (FMT_CPLUSPLUS >= 202302L)
#  define FMT_CONSTEXPR23 constexpr
#else
#  define FMT_CONSTEXPR23
#endif

and using this define in the declaration of isfinite

template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value&&
                                        has_isfinite<T>::value)>
FMT_CONSTEXPR23 bool isfinite(T value) {
  constexpr T inf = T(std::numeric_limits<double>::infinity());
  if (is_constant_evaluated())
    return !detail::isnan(value) && value < inf && value > -inf;
  return std::isfinite(value);
}

I can propose a patch if you are happy with this solution.

vitaut · 2023-12-09T00:25:02Z

I can propose a patch if you are happy with this solution.

Please do.

Fix fmtlib#3745

Dependent function std::isfinite is constexpr for c++23. https://en.cppreference.com/w/cpp/numeric/math/isfinite Fix fmtlib#3745

phprus · 2023-12-09T06:52:50Z

Which version of libc++ or libstdc++ are you using?

std::isfinite is only used in non-constexpr contexts.

In a constexpr context, the condition and code must be executed:

if (is_constant_evaluated())
  return !detail::isnan(value) && value < inf && value > -inf;

phprus · 2023-12-09T07:29:46Z

When using Clang-17 and libc++-17 in c++20 mode, compilation and tests pass without errors:

https://github.com/phprus/fmt/actions/runs/7149828208/job/19472458664
https://github.com/phprus/fmt/actions/runs/7149828208/job/19472458718

hchataing · 2023-12-10T00:56:16Z

Will confirm the details on monday, but from my knowledge: the code is compiled with std=gnu++20 but the library supports c++17 only

hchataing · 2023-12-12T16:45:24Z

Turns out the standard library does not provide std::is_constant_evaluated, or at least it is not in context, thus making the function implementation non constexpr compatible.
That's the what we get for having different versions for the compiler and stl 😿

The implementation failed to be constexpr in the situation where: __cplusplus == 202002L && !defined(__cpp_lib_is_constant_evaluated) Fix fmtlib#3745

vitaut · 2023-12-13T15:09:05Z

@hchataing, could you check if #3754 fixes the issue?

hchataing · 2023-12-13T16:24:12Z

I checked the compiler pre-defined variables, and it is not going to be sufficient.
For reference:

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#define __cpp_static_call_operator 202207L
#define __cpp_structured_bindings 201606L
#define __cpp_template_auto 201606L
#define __cpp_threadsafe_static_init 200806L
#define __cpp_unicode_characters 200704L
#define __cpp_unicode_literals 200710L
#define __cpp_user_defined_literals 200809L
#define __cpp_using_enum 201907L
#define __cpp_variable_templates 201304L
#define __cpp_variadic_templates 200704L
#define __cpp_variadic_using 201611L
#define __gnu_linux__ 1
#define __k8 1
#define __k8__ 1
#define __linux 1
#define __linux__ 1
#define __llvm__ 1
#define __pic__ 2
#define __pie__ 2
#define __private_extern__ extern
#define __seg_fs __attribute__((address_space(257)))
#define __seg_gs __attribute__((address_space(256)))
#define __tune_k8__ 1
#define __unix 1
#define __unix__ 1
#define __x86_64 1
#define __x86_64__ 1

vitaut · 2023-12-13T16:49:18Z

_LIBCPP_VERSION should be defined by the library, not the compiler. Are you sure that it is not defined?

vitaut · 2023-12-13T16:53:34Z

You could check with something like

#ifndef _LIBCPP_VERSION
#  error _LIBCPP_VERSION undefined
#endif

vitaut · 2023-12-17T16:35:12Z

Should be fixed by #3754 but if you still get this issue feel free to reopen and provide more details, most importantly print the actual value of _LIBCPP_VERSION.

hchataing · 2023-12-18T16:12:22Z

Got it, thanks for the help !

vitaut added the help wanted label Dec 8, 2023

hchataing mentioned this issue Dec 9, 2023

Update isfinite declaration to be constexpr for c++23 only #3746

Closed

hchataing added a commit to hchataing/fmt that referenced this issue Dec 9, 2023

Update isfinite declaration to be constexpr for c++23 only

2b23e4e

Fix fmtlib#3745

hchataing added a commit to hchataing/fmt that referenced this issue Dec 9, 2023

Update isfinite declaration to be constexpr for c++23 only

f009126

Dependent function std::isfinite is constexpr for c++23. https://en.cppreference.com/w/cpp/numeric/math/isfinite Fix fmtlib#3745

hchataing added a commit to hchataing/fmt that referenced this issue Dec 9, 2023

Update isfinite declaration to be constexpr for c++23 only

04338ce

Dependent function std::isfinite is constexpr for c++23. https://en.cppreference.com/w/cpp/numeric/math/isfinite Fix fmtlib#3745

hchataing added a commit to hchataing/fmt that referenced this issue Dec 12, 2023

Fix isfinite implementation to be constexpr

f68bff6

The implementation failed to be constexpr in the situation where: __cplusplus == 202002L && !defined(__cpp_lib_is_constant_evaluated) Fix fmtlib#3745

phprus mentioned this issue Dec 13, 2023

Add stdlib version check for C++20 #3754

Merged

vitaut closed this as completed in #3754 Dec 17, 2023

BrewTestBot mentioned this issue Jan 1, 2024

fmt 10.2.0 Homebrew/homebrew-core#158708

Merged

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`isfinite` declared `constexpr` for c++20 #3745

`isfinite` declared `constexpr` for c++20 #3745

hchataing commented Dec 8, 2023 •

edited

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hchataing commented Dec 18, 2023

isfinite declared constexpr for c++20 #3745

isfinite declared constexpr for c++20 #3745

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hchataing commented Dec 8, 2023 • edited Loading

hchataing commented Dec 8, 2023

vitaut commented Dec 9, 2023

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phprus commented Dec 9, 2023

hchataing commented Dec 10, 2023

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vitaut commented Dec 13, 2023

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vitaut commented Dec 17, 2023

hchataing commented Dec 18, 2023

`isfinite` declared `constexpr` for c++20 #3745

`isfinite` declared `constexpr` for c++20 #3745

hchataing commented Dec 8, 2023 •

edited

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