Special case some duration arithmetic for GCC and PPC because their long double constant folding is broken. Fixes PR#39696.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@357478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/thread b/include/thread
index df06ff7..400459a 100644
--- a/include/thread
+++ b/include/thread
@@ -434,7 +434,12 @@
using namespace chrono;
if (__d > duration<_Rep, _Period>::zero())
{
+#if defined(_LIBCPP_COMPILER_GCC) && (__powerpc__ || __POWERPC__)
+ // GCC's long double const folding is incomplete for IBM128 long doubles.
+ _LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
+#else
_LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
+#endif
nanoseconds __ns;
if (__d < _Max)
{
