[AArch64] Add support for crtfastmath.c

diff --git a/gcc/config/aarch64/aarch64-elf-raw.h b/gcc/config/aarch64/aarch64-elf-raw.h
index adec7e7..b9d4e8d 100644
--- a/gcc/config/aarch64/aarch64-elf-raw.h
+++ b/gcc/config/aarch64/aarch64-elf-raw.h
@@ -23,7 +23,9 @@ 
 #define GCC_AARCH64_ELF_RAW_H
 
 #define STARTFILE_SPEC " crti%O%s crtbegin%O%s crt0%O%s"
-#define ENDFILE_SPEC " crtend%O%s crtn%O%s"
+#define ENDFILE_SPEC \
+  " crtend%O%s crtn%O%s " \
+  "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
 
 #ifndef LINK_SPEC
 #define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X \
diff --git a/gcc/config/aarch64/aarch64-linux.h b/gcc/config/aarch64/aarch64-linux.h
index 8d20310..1731432 100644
--- a/gcc/config/aarch64/aarch64-linux.h
+++ b/gcc/config/aarch64/aarch64-linux.h
@@ -37,6 +37,14 @@ 
 
 #define LINK_SPEC LINUX_TARGET_LINK_SPEC
 
+#define GNU_USER_TARGET_MATHFILE_SPEC \
+  "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC   \
+  GNU_USER_TARGET_MATHFILE_SPEC " " \
+  GNU_USER_TARGET_ENDFILE_SPEC
+
 #define TARGET_OS_CPP_BUILTINS()		\
   do						\
     {						\
diff --git a/libgcc/config.host b/libgcc/config.host
index 0550c34..2ea8f20 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -322,13 +322,15 @@  esac
 case ${host} in
 aarch64*-*-elf)
 	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
+	extra_parts="$extra_parts crtfastmath.o"
 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
-	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp"
+	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
 	;;
 aarch64*-*-linux*)
+	extra_parts="$extra_parts crtfastmath.o"
 	md_unwind_header=aarch64/linux-unwind.h
 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
-	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp"
+	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
 	;;
 alpha*-*-linux*)
 	tmake_file="${tmake_file} alpha/t-alpha alpha/t-ieee t-crtfm alpha/t-linux"
diff --git a/libgcc/config/aarch64/crtfastmath.c b/libgcc/config/aarch64/crtfastmath.c
new file mode 100644
index 0000000..3a8ddfc
--- /dev/null
+++ b/libgcc/config/aarch64/crtfastmath.c
@@ -0,0 +1,36 @@ 
+/*
+ * Copyright (C) 2014 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 3, or (at your option) any
+ * later version.
+ *
+ * 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.
+ *
+ * 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 _FPU_FPCR_FZ 0x1000000
+
+#define _FPU_SETCW(fpcr)				   \
+  {							   \
+    __asm__ __volatile__ ("msr	fpcr, %0" : : "r" (fpcr)); \
+  }
+
+static void __attribute__((constructor))
+set_fast_math (void)
+{
+  /* Flush to zero, round to nearest, IEEE exceptions disabled.  */
+  _FPU_SETCW (_FPU_FPCR_FZ);
+}