/*
- * Copyright (C) 2005 Free Software Foundation, Inc.
+ * Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
+ * Free Software Foundation; either version 3, or (at your option) any
* later version.
*
- * In addition to the permissions in the GNU General Public License, the
- * Free Software Foundation gives you unlimited permission to link the
- * compiled version of this file with other programs, and to distribute
- * those programs without any restriction coming from the use of this
- * file. (The General Public License restrictions do apply in other
- * respects; for example, they cover modification of the file, and
- * distribution when not linked into another program.)
- *
* This file 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
* General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- * As a special exception, if you link this library with files
- * compiled with GCC to produce an executable, this does not cause
- * the resulting executable to be covered by the GNU General Public License.
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ * <http://www.gnu.org/licenses/>.
*/
#define MXCSR_DAZ (1 << 6) /* Enable denormals are zero mode */
#define MXCSR_FTZ (1 << 15) /* Enable flush to zero mode */
-#define FXSAVE (1 << 24)
-#define SSE (1 << 25)
+#ifndef __x86_64__
+/* All 64-bit targets have SSE and DAZ;
+ only check them explicitly for 32-bit ones. */
+#include "cpuid.h"
+#endif
static void __attribute__((constructor))
#ifndef __x86_64__
-/* The i386 ABI only requires 4-byte stack alignment, so this is neccessary
+/* The i386 ABI only requires 4-byte stack alignment, so this is necessary
to make sure the fxsave struct gets correct alignment.
See PR27537 and PR28621. */
__attribute__ ((force_align_arg_pointer))
set_fast_math (void)
{
#ifndef __x86_64__
- /* All 64-bit targets have SSE and DAZ; only check them explicitly
- for 32-bit ones. */
unsigned int eax, ebx, ecx, edx;
- /* See if we can use cpuid. */
- asm volatile ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
- "pushl %0; popfl; pushfl; popl %0; popfl"
- : "=&r" (eax), "=&r" (ebx)
- : "i" (0x00200000));
-
- if (((eax ^ ebx) & 0x00200000) == 0)
+ if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
return;
- /* Check the highest input value for eax. */
- asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
- : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
- : "0" (0));
-
- if (eax == 0)
- return;
-
- asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
- : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
- : "0" (1));
-
- if (edx & SSE)
+ if (edx & bit_SSE)
{
unsigned int mxcsr = __builtin_ia32_stmxcsr ();
mxcsr |= MXCSR_FTZ;
- if (edx & FXSAVE)
+ if (edx & bit_FXSAVE)
{
/* Check if DAZ is available. */
struct
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