Support --with-fpmath=sse for x86.

2010-02-26  H.J. Lu  <hongjiu.lu@intel.com>

	* config.gcc: Support --with-fpmath=sse for x86.

	* config/i386/ssemath.h: New.

	* doc/install.texi (--with-fpmath=sse): Documented.

From-SVN: r157090

gcc/ChangeLog

@@ -1,3 +1,11 @@
+2010-02-26  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* config.gcc: Support --with-fpmath=sse for x86.
+
+	* config/i386/ssemath.h: New.
+
+	* doc/install.texi (--with-fpmath=sse): Documented.
+
 2010-02-26  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/43188

gcc/config.gcc

@@ -2835,7 +2835,18 @@ esac
 # This block sets nothing except for with_arch.
 if test x$with_arch = x ; then
   case ${target} in
-    i[34567]86-*-*|x86_64-*-*)
+    i[34567]86-*-darwin*)
+      # Don't set default arch for Darwin since it will set the default
+      # ISA to SSE2.
+      ;;
+    i[34567]86-*-*)
+      # Don't set default arch if --with-fpmath is used since it will set
+      # the default ISA to SSE2.
+      if test x$with_fpmath = x; then
+        with_arch=$arch
+      fi
+      ;;
+    x86_64-*-*)
       with_arch=$arch
       ;;
   esac
@@ -2856,6 +2867,27 @@ if test x$with_arch = x ; then
   esac
 fi
 
+# Support --with-fpmath.
+if test x$with_fpmath != x; then
+  case ${target} in
+    i[34567]86-*-* | x86_64-*-*)
+      case ${with_fpmath} in
+      sse)
+	tm_file="${tm_file} i386/ssemath.h"
+	;;
+      *)
+	echo "Invalid --with-fpmath=$with_fpmath" 1>&2
+	exit 1
+	;;
+      esac
+      ;;
+    *)
+      echo "--with-fpmath isn't supported for $target." 1>&2
+      exit 1
+      ;;
+  esac
+fi
+
 # Similarly for --with-schedule.
 if test x$with_schedule = x; then
 	case ${target} in

gcc/config/i386/ssemath.h

@@ -0,0 +1,25 @@
+/* Copyright (C) 2010
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option)
+any later version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#undef TARGET_FPMATH_DEFAULT
+#define TARGET_FPMATH_DEFAULT (TARGET_SSE2 ? FPMATH_SSE : FPMATH_387)
+
+#undef TARGET_SUBTARGET32_ISA_DEFAULT
+#define TARGET_SUBTARGET32_ISA_DEFAULT \
+   (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_SSE | OPTION_MASK_ISA_SSE2)

gcc/doc/install.texi

@@ -1170,6 +1170,11 @@ of the arguments depend on the target.
 Specify if the compiler should default to @option{-marm} or @option{-mthumb}.
 This option is only supported on ARM targets.
 
+@item --with-fpmath=sse
+Specify if the compiler should default to @option{-msse2} and
+@option{-mfpmath=sse}.  This option is only supported on i386 and
+x86-64 targets.
+
 @item --with-divide=@var{type}
 Specify how the compiler should generate code for checking for
 division by zero.  This option is only supported on the MIPS target.