+2005-08-10 H.J. Lu <hongjiu.lu@intel.com>
+
+ * config.gcc (i[34567]86-*-linux*): Add i386/t-crtfm to tm-file.
+ (x86_64-*-linux*): Likewise.
+
+ * config/i386/crtfastmath.c: New file.
+ * config/i386/t-crtfm: Likewise.
+
+ * config/i386/linux.h (ENDFILE_SPEC): New.
+ * config/i386/linux64.h (ENDFILE_SPEC): Likewise.
+
+ * config/i386/t-linux64 (EXTRA_MULTILIB_PARTS): Add
+ crtfastmath.o.
+
2005-08-10 Dorit Nuzman <dorit@il.ibm.com>
* doc/md.texi: (reduc_smin, reduc_umin, reduc_splus, reduc_uplus):
i[34567]86-*-knetbsd*-gnu) tm_file="${tm_file} knetbsd-gnu.h i386/knetbsd-gnu.h" ;;
i[34567]86-*-kfreebsd*-gnu) tm_file="${tm_file} kfreebsd-gnu.h i386/kfreebsd-gnu.h" ;;
esac
- tmake_file="${tmake_file} i386/t-crtstuff"
+ tmake_file="${tmake_file} i386/t-crtstuff i386/t-crtfm"
;;
x86_64-*-linux* | x86_64-*-kfreebsd*-gnu | x86_64-*-knetbsd*-gnu)
tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h svr4.h linux.h \
x86_64-*-kfreebsd*-gnu) tm_file="${tm_file} kfreebsd-gnu.h" ;;
x86_64-*-knetbsd*-gnu) tm_file="${tm_file} knetbsd-gnu.h" ;;
esac
- tmake_file="${tmake_file} i386/t-linux64"
+ tmake_file="${tmake_file} i386/t-linux64 i386/t-crtfm"
;;
i[34567]86-*-gnu*)
;;
--- /dev/null
+/*
+ * Copyright (C) 2005 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
+ * 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, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, 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.
+ */
+
+#define MXCSR_DAZ (1 << 6) /* Enable denormals are zero mode */
+#define MXCSR_FTZ (1 << 15) /* Enable flush to zero mode */
+
+static void __attribute__((constructor))
+set_fast_math (void)
+{
+#ifndef __x86_64__
+ /* SSE is the part of 64bit. Only need to check it for 32bit. */
+ 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)
+ 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 & (1 << 25))
+#endif
+ {
+ unsigned int mxcsr = __builtin_ia32_stmxcsr ();
+ mxcsr |= MXCSR_DAZ | MXCSR_FTZ;
+ __builtin_ia32_ldmxcsr (mxcsr);
+ }
+}
git://gcc.gnu.org / gcc.git / commitdiff