[BZ #3427]

2007-03-22  Jakub Jelinek  <jakub@redhat.com>
	[BZ #3427]
	* sysdeps/x86_64/fpu/feholdexcpt.c (feholdexcept): Clear all
	exceptions both in SW and MXCSR.
	* sysdeps/x86_64/fpu/feupdateenv.c: New file.
	* sysdeps/x86_64/fpu/feenablxcpt.c (feenableexcept): Remove dead code.
	* sysdeps/x86_64/fpu/fedisblxcpt.c (fedisableexcept): Likewise.
	* sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions
	in MXCSR if SSE is available.
	* sysdeps/i386/fpu/feupdateenv.c: Include unistd.h, dl-procinfo.h
	and ldsodefs.h.
	(__feupdateenv): Query exceptions also from MXCSR if SSE is available.
	Fix comment typo.
	* sysdeps/ia64/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions.
	Return 0 rather than 1.
	* sysdeps/ia64/fpu/feupdateenv.c (feupdateenv): Fix comment typo.
	Remove incorrect part of a comment.  Fix argument to feraiseexcept.
	* math/test-fenv.c (feholdexcept_tests): New function.
	(main): Call it.

2007-01-05  Richard B. Kreckel  <kreckel@ginac.de>

	[BZ #3427]
	* sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions
	in SW.

4 files changed, 66 insertions, 14 deletions

diff --git a/sysdeps/x86_64/fpu/fedisblxcpt.c b/sysdeps/x86_64/fpu/fedisblxcpt.c
index e8157da126..261c1e877c 100644
--- a/sysdeps/x86_64/fpu/fedisblxcpt.c
+++ b/sysdeps/x86_64/fpu/fedisblxcpt.c
@@ -1,5 +1,5 @@
 /* Disable floating-point exceptions.
-   Copyright (C) 2001 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Andreas Jaeger <aj@suse.de>, 2001.
 
@@ -24,7 +24,7 @@ int
 fedisableexcept (int excepts)
 {
   unsigned short int new_exc, old_exc;
-  unsigned int new, old;
+  unsigned int new;
 
   excepts &= FE_ALL_EXCEPT;
 
@@ -40,8 +40,6 @@ fedisableexcept (int excepts)
   __asm__ ("stmxcsr %0" : "=m" (*&new));
 
   /* The SSE exception masks are shifted by 7 bits.  */
-  old = (~new) & (FE_ALL_EXCEPT << 7);
-
   new |= excepts << 7;
   __asm__ ("ldmxcsr %0" : : "m" (*&new));
 
diff --git a/sysdeps/x86_64/fpu/feenablxcpt.c b/sysdeps/x86_64/fpu/feenablxcpt.c
index 43259d0cfb..7bbc368d27 100644
--- a/sysdeps/x86_64/fpu/feenablxcpt.c
+++ b/sysdeps/x86_64/fpu/feenablxcpt.c
@@ -1,5 +1,5 @@
 /* Enable floating-point exceptions.
-   Copyright (C) 2001 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Andreas Jaeger <aj@suse.de>, 2001.
 
@@ -24,7 +24,7 @@ int
 feenableexcept (int excepts)
 {
   unsigned short int new_exc, old_exc;
-  unsigned int new, old;
+  unsigned int new;
 
   excepts &= FE_ALL_EXCEPT;
 
@@ -40,8 +40,6 @@ feenableexcept (int excepts)
   __asm__ ("stmxcsr %0" : "=m" (*&new));
 
   /* The SSE exception masks are shifted by 7 bits.  */
-  old = (~new) & (FE_ALL_EXCEPT << 7);
-
   new &= ~(excepts << 7);
   __asm__ ("ldmxcsr %0" : : "m" (*&new));
 
diff --git a/sysdeps/x86_64/fpu/feholdexcpt.c b/sysdeps/x86_64/fpu/feholdexcpt.c
index a9b21a3c25..d56ab163ca 100644
--- a/sysdeps/x86_64/fpu/feholdexcpt.c
+++ b/sysdeps/x86_64/fpu/feholdexcpt.c
@@ -1,5 +1,5 @@
 /* Store current floating-point environment and clear exceptions.
-   Copyright (C) 2001, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2005, 2007 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
@@ -22,19 +22,24 @@
 int
 feholdexcept (fenv_t *envp)
 {
-  unsigned short int work;
   unsigned int mxcsr;
+  fenv_t temp;
 
   /* Store the environment.  */
   __asm__ ("fnstenv %0\n"
-	   "stmxcsr %1" : "=m" (*envp), "=m" (envp->__mxcsr));
+	   "stmxcsr %1" : "=m" (temp), "=m" (temp.__mxcsr));
+  *envp = temp;
 
   /* Now set all exceptions to non-stop, first the x87 FPU.  */
-  work = envp->__control_word | 0x3f;
-  __asm__ ("fldcw %0" : : "m" (*&work));
+  temp.__control_word |= 0x3f;
+
+  /* And clear all exceptions.  */
+  temp.__status_word &= ~0x3f;
+
+  __asm__ ("fldenv %0" : : "m" (temp));
 
   /* Set the SSE MXCSR register.  */
-  mxcsr = envp->__mxcsr | 0x1f80;
+  mxcsr = (envp->__mxcsr | 0x1f80) & ~0x3f;
   __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr));
 
   return 0;
diff --git a/sysdeps/x86_64/fpu/feupdateenv.c b/sysdeps/x86_64/fpu/feupdateenv.c
new file mode 100644
index 0000000000..e23f1affa6
--- /dev/null
+++ b/sysdeps/x86_64/fpu/feupdateenv.c
@@ -0,0 +1,51 @@
+/* Install given floating-point environment and raise exceptions.
+   Copyright (C) 1997,99,2000,01,07 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <fenv.h>
+
+int
+__feupdateenv (const fenv_t *envp)
+{
+  fexcept_t temp;
+  unsigned int xtemp;
+
+  /* Save current exceptions.  */
+  __asm__ ("fnstsw %0\n\tstmxcsr %1" : "=m" (*&temp), "=m" (xtemp));
+  temp = (temp | xtemp) & FE_ALL_EXCEPT;
+
+  /* Install new environment.  */
+  fesetenv (envp);
+
+  /* Raise the saved exception.  Incidently for us the implementation
+     defined format of the values in objects of type fexcept_t is the
+     same as the ones specified using the FE_* constants.  */
+  feraiseexcept ((int) temp);
+
+  /* Success.  */
+  return 0;
+}
+
+#include <shlib-compat.h>
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
+strong_alias (__feupdateenv, __old_feupdateenv)
+compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
+#endif
+
+versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);