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authorJoseph Myers <joseph@codesourcery.com>2015-10-28 18:50:20 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-10-28 18:50:20 +0000
commit0b9af583a5c2d68085e88cece13952bf05dc4882 (patch)
treeefc4a66a9b018447c371749d91cf8a5b8508754f /sysdeps/x86/fpu/test-fenv-clear-sse.c
parenteae6c382bdca2e7ac582a69d56c9c228b678ee67 (diff)
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Fix i386/x86_64 fesetenv SSE exception clearing (bug 19181).
The i386 and x86_64 versions of fesetenv, when called with FE_DFL_ENV
or FE_NOMASK_ENV as argument, do not clear SSE exceptions raised in
MXCSR.  These arguments should, like other fenv_t values, represent
the whole of the floating-point state, so such exceptions should be
cleared; this patch adds the required clearing.  (Discovered while
working on bug 16068.)

Tested for x86_64 and x86.

	[BZ #19181]
	* sysdeps/i386/fpu/fesetenv.c (__fesetenv): Clear already-raised
	SSE exceptions when argument is FE_DFL_ENV or FE_NOMASK_ENV.
	* sysdeps/x86_64/fpu/fesetenv.c (__fesetenv): Likewise.
	* math/test-fenv-clear-main.c: New file.
	* math/test-fenv-clear.c: Likewise.
	* math/Makefile (tests): Add test-fenv-clear.
	* sysdeps/x86/fpu/test-fenv-clear-sse.c: New file.
	* sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add
	test-fenv-clear-sse.
	[$(subdir) = math] (CFLAGS-test-fenv-clear-sse.c): New variable.
Diffstat (limited to 'sysdeps/x86/fpu/test-fenv-clear-sse.c')
-rw-r--r--sysdeps/x86/fpu/test-fenv-clear-sse.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/x86/fpu/test-fenv-clear-sse.c b/sysdeps/x86/fpu/test-fenv-clear-sse.c
new file mode 100644
index 0000000000..531164c79c
--- /dev/null
+++ b/sysdeps/x86/fpu/test-fenv-clear-sse.c
@@ -0,0 +1,45 @@
+/* Test fesetenv (FE_DFL_ENV) and fesetenv (FE_NOMASK_ENV) clear
+   exceptions (bug 19181).  SSE version.
+   Copyright (C) 2015 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
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <cpuid.h>
+#include <stdbool.h>
+
+static bool
+have_sse2 (void)
+{
+  unsigned int eax, ebx, ecx, edx;
+
+  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+    return false;
+
+  return (edx & bit_SSE2) != 0;
+}
+
+#define CHECK_CAN_TEST						\
+  do								\
+    {								\
+      if (!have_sse2 ())					\
+	{							\
+	  puts ("CPU does not support SSE2, cannot test");	\
+	  return 0;						\
+	}							\
+    }								\
+  while (0)
+
+#include <test-fenv-clear-main.c>