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[CUDA] Mark __libcpp_{isnan,isinf,isfinite} as constexpr.

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Summary:
This makes these functions available on host and device, which is
necessary to compile <complex> for the device.

Reviewers: hfinkel, EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25403

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@287012 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Lebar
2016-11-15 19:15:57 +00:00
parent e3cb222597
commit bb835ac64d
2 changed files with 35 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/cmath
View File

@@ -554,7 +554,7 @@ hypot(_A1 __lcpp_x, _A2 __lcpp_y, _A3 __lcpp_z) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<is_floating_point<_A1>::value, bool>::type
__libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
{
#if __has_builtin(__builtin_isnan)
@@ -566,7 +566,7 @@ __libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<!is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<!is_floating_point<_A1>::value, bool>::type
__libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
{
return isnan(__lcpp_x);
@@ -574,7 +574,7 @@ __libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<is_floating_point<_A1>::value, bool>::type
__libcpp_isinf(_A1 __lcpp_x) _NOEXCEPT
{
#if __has_builtin(__builtin_isinf)
@@ -586,7 +586,7 @@ __libcpp_isinf(_A1 __lcpp_x) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<!is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<!is_floating_point<_A1>::value, bool>::type
__libcpp_isinf(_A1 __lcpp_x) _NOEXCEPT
{
return isinf(__lcpp_x);
@@ -594,7 +594,7 @@ __libcpp_isinf(_A1 __lcpp_x) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<is_floating_point<_A1>::value, bool>::type
__libcpp_isfinite(_A1 __lcpp_x) _NOEXCEPT
{
#if __has_builtin(__builtin_isfinite)
@@ -606,7 +606,7 @@ __libcpp_isfinite(_A1 __lcpp_x) _NOEXCEPT
template <class _A1>
_LIBCPP_ALWAYS_INLINE
typename enable_if<!is_floating_point<_A1>::value, bool>::type
_LIBCPP_CONSTEXPR typename enable_if<!is_floating_point<_A1>::value, bool>::type
__libcpp_isfinite(_A1 __lcpp_x) _NOEXCEPT
{
return isfinite(__lcpp_x);

29
test/libcxx/numerics/c.math/constexpr-fns.pass.cpp Normal file
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@@ -0,0 +1,29 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Check that the overloads of std::__libcpp_{isnan,isinf,isfinite} that take
// floating-point values are evaluatable from constexpr contexts.
//
// These functions need to be constexpr in order to be called from CUDA, see
// https://reviews.llvm.org/D25403. They don't actually need to be
// constexpr-evaluatable, but that's what we check here, since we can't check
// true constexpr-ness.
//
// UNSUPPORTED: c++98, c++03
#include <cmath>
constexpr bool a = std::__libcpp_isnan(0.);
constexpr bool b = std::__libcpp_isinf(0.0);
constexpr bool c = std::__libcpp_isfinite(0.0);
int main()
{
return 0;
}