libstdc++: Fix std::numeric_limits<__float128>::max_digits10 [PR121374]
When I added this explicit specialization in r14-1433-gf150a084e25eaa I
used the wrong value for the number of mantissa digits (I used 112
instead of 113). Then when I refactored it in r14-1582-g6261d10521f9fd I
used the value calculated from the incorrect value (35 instead of 36).
libstdc++-v3/ChangeLog:
PR libstdc++/121374
* include/std/limits (numeric_limits<__float128>::max_digits10):
Fix value.
* testsuite/18_support/numeric_limits/128bit.cc: Check value.
(cherry picked from commit cf88ed5bf20c86ca38da19358ff79a34adb4d0b5)
diff --git a/libstdc++-v3/include/std/limits b/libstdc++-v3/include/std/limits
index 2331c25..5662a22 100644
--- a/libstdc++-v3/include/std/limits
+++ b/libstdc++-v3/include/std/limits
@@ -2129,7 +2129,7 @@
static _GLIBCXX_USE_CONSTEXPR int digits = 113;
static _GLIBCXX_USE_CONSTEXPR int digits10 = 33;
#if __cplusplus >= 201103L
- static constexpr int max_digits10 = 35;
+ static constexpr int max_digits10 = 36;
#endif
static _GLIBCXX_USE_CONSTEXPR bool is_signed = true;
static _GLIBCXX_USE_CONSTEXPR bool is_integer = false;
diff --git a/libstdc++-v3/testsuite/18_support/numeric_limits/128bit.cc b/libstdc++-v3/testsuite/18_support/numeric_limits/128bit.cc
index b13d837..bf12b65 100644
--- a/libstdc++-v3/testsuite/18_support/numeric_limits/128bit.cc
+++ b/libstdc++-v3/testsuite/18_support/numeric_limits/128bit.cc
@@ -4,6 +4,11 @@
#if __SIZEOF_FLOAT128__
__extension__ template class std::numeric_limits<__float128>;
+
+# if __cplusplus >= 201103L
+static_assert( std::numeric_limits<__float128>::max_digits10 == 36,
+ "PR libstdc++/121374" );
+# endif
#endif
#if __SIZEOF_INT128__
