Fix the inaccuracy of j0f/j1f/y0f/y1f [BZ #14469, #14470, #14471, #14472]

[thirdparty/glibc.git] / math / w_log2_compat.c

diff --git a/math/w_log2_compat.c b/math/w_log2_compat.c
index 6d1f9f2159bf3ca1426b6858a07a3c5145434790..5a2e1b62a0591dde7102f64413005ba2f20758e2 100644 (file)
--- a/math/w_log2_compat.c
+++ b/math/w_log2_compat.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+/* Copyright (C) 2011-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
 
@@ -14,18 +14,21 @@
 
    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
+   <https://www.gnu.org/licenses/>.  */
 
 #include <fenv.h>
 #include <math.h>
 #include <math_private.h>
 #include <math-svid-compat.h>
+#include <libm-alias-double.h>
 
 
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) \
+                        || defined NO_LONG_DOUBLE \
+                        || defined LONG_DOUBLE_COMPAT)
 /* wrapper log2(x) */
 double
-__log2 (double x)
+__log2_compat (double x)
 {
   if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
     {
@@ -43,9 +46,17 @@ __log2 (double x)
 
   return  __ieee754_log2 (x);
 }
-weak_alias (__log2, log2)
+# if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29)
+compat_symbol (libm, __log2_compat, log2, GLIBC_2_1);
+# endif
 # ifdef NO_LONG_DOUBLE
-strong_alias (__log2, __log2l)
-weak_alias (__log2, log2l)
+weak_alias (__log2_compat, log2l)
+# endif
+# ifdef LONG_DOUBLE_COMPAT
+/* Work around gas bug "multiple versions for symbol".  */
+weak_alias (__log2_compat, __log2_compat_alias)
+
+LONG_DOUBLE_COMPAT_CHOOSE_libm_log2l (
+  compat_symbol (libm, __log2_compat_alias, log2l, FIRST_VERSION_libm_log2l), );
 # endif
 #endif