Improve the accuracy of tgamma (BZ #26983)

[thirdparty/glibc.git] / math / fenv.h

diff --git a/math/fenv.h b/math/fenv.h
index 7f4ceb744ca24332bf156a1b4ca82a3f65003e72..feeacfc2f492c1b571e0c466294f050c173dbcc0 100644 (file)
--- a/math/fenv.h
+++ b/math/fenv.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -13,7 +13,7 @@
 
    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/>.  */
 
 /*
  * ISO C99 7.6: Floating-point environment     <fenv.h>
@@ -38,6 +38,12 @@
    fexcept_t   type for object representing the floating-point exception
                flags including status associated with the flags
 
+   femode_t    type for object representing floating-point control modes
+
+   FE_DFL_MODE macro of type pointer to const femode_t to be used as the
+               argument to fesetmode; in this case the default control
+               modes will be used
+
    The following macros are defined iff the implementation supports this
    kind of exception.
    FE_INEXACT          inexact result
@@ -71,7 +77,7 @@ extern int fegetexceptflag (fexcept_t *__flagp, int __excepts) __THROW;
 /* Raise the supported exceptions represented by EXCEPTS.  */
 extern int feraiseexcept (int __excepts) __THROW;
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
 /* Set the supported exception flags represented by EXCEPTS, without
    causing enabled traps to be taken.  */
 extern int fesetexcept (int __excepts) __THROW;
@@ -85,6 +91,12 @@ extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
    currently set.  */
 extern int fetestexcept (int __excepts) __THROW;
 
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Determine which of subset of the exceptions specified by EXCEPTS
+   are set in *FLAGP.  */
+extern int fetestexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
+#endif
+
 
 /* Rounding control.  */
 
@@ -116,9 +128,25 @@ extern int fesetenv (const fenv_t *__envp) __THROW;
 extern int feupdateenv (const fenv_t *__envp) __THROW;
 
 
-/* Include optimization.  */
-#ifdef __OPTIMIZE__
-# include <bits/fenvinline.h>
+/* Control modes.  */
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Store the current floating-point control modes in the object
+   pointed to by MODEP.  */
+extern int fegetmode (femode_t *__modep) __THROW;
+
+/* Establish the floating-point control modes represented by the
+   object pointed to by MODEP.  */
+extern int fesetmode (const femode_t *__modep) __THROW;
+#endif
+
+
+/* NaN support.  */
+
+#if (__GLIBC_USE (IEC_60559_BFP_EXT_C2X)               \
+     && defined FE_INVALID                     \
+     && defined __SUPPORT_SNAN__)
+# define FE_SNANS_ALWAYS_SIGNAL        1
 #endif
 
 #ifdef __USE_GNU