[ARM] Select appropriate memcpy implementation for ARMv8-a.

The newlib configury logic that detects architecture version and
chooses an appropriate memcpy implementation does not consider
ARMv8-a.

This patch adds configury logic to detect ARMv8-a along with the
associated changes in Makefile.am and memcpy.

newlib/ChangeLog

@@ -1,3 +1,12 @@
+2015-11-03  Marcus Shawcroft  <marcus.shawcroft@arm.com>
+
+	* libc/machine/arm/configure.in: Check for __ARM_ARCH_8A__.
+	* libc/machine/arm/memcpy.S: Handle __ARM_ARCH_8A__.
+	* libc/machine/arm/Makefile.am: Consider HAVE_ARMV8A in memcpy
+	selection.
+	* libc/machine/arm/Makefile.in: Regenerate.
+	* libc/machine/arm/configure: Regenerate.
+
 2015-11-02  Jon Turney  <jon.turney@dronecode.org.uk>
 
 	* HOWTO: Update.

newlib/libc/machine/arm/Makefile.am

@@ -33,6 +33,10 @@ if OPT_SIZE
 MEMCPY_SRC=
 MEMCPY_OBJ=
 else
+if HAVE_ARMV8A
+MEMCPY_SRC=memcpy.S
+MEMCPY_OBJ=$(lpfx)memcpy.o
+else
 if HAVE_ARMV7A
 MEMCPY_SRC=memcpy.S
 MEMCPY_OBJ=$(lpfx)memcpy.o
@@ -45,6 +49,7 @@ MEMCPY_SRC=
 MEMCPY_OBJ=
 endif !HAVE_ARMV7M
 endif !HAVE_ARMV7A
+endif !HAVE_ARMV8A
 endif !OPT_SIZE
 
 lib_a_SOURCES = setjmp.S access.c strcmp.S strcpy.c \

newlib/libc/machine/arm/Makefile.in

@@ -71,12 +71,14 @@ lib_a_AR = $(AR) $(ARFLAGS)
 @HAVE_THUMB1_FALSE@am__DEPENDENCIES_1 = $(lpfx)strlen.o
 @HAVE_THUMB1_TRUE@@OPT_SIZE_TRUE@am__DEPENDENCIES_1 = $(lpfx)strlen.o
 @HAVE_ARMV7_TRUE@am__DEPENDENCIES_2 = $(lpfx)memchr.o
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@OPT_SIZE_FALSE@am__DEPENDENCIES_3 = $(lpfx)memcpy.o
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@am__DEPENDENCIES_3 = $(lpfx)memcpy.o
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@am__DEPENDENCIES_3 =  \
+@HAVE_ARMV7A_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@am__DEPENDENCIES_3 = $(lpfx)memcpy.o
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@	$(lpfx)memcpy.o
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@am__DEPENDENCIES_3 =  \
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@OPT_SIZE_FALSE@am__objects_1 = lib_a-memcpy.$(OBJEXT)
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@	$(lpfx)memcpy.o
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@am__objects_1 =  \
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@am__objects_1 = lib_a-memcpy.$(OBJEXT)
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@	lib_a-memcpy.$(OBJEXT)
+@HAVE_ARMV7A_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@am__objects_1 = lib_a-memcpy.$(OBJEXT)
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@am__objects_1 =  \
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@	lib_a-memcpy.$(OBJEXT)
 @HAVE_ARMV7_TRUE@am__objects_2 = lib_a-memchr.$(OBJEXT)
 @HAVE_THUMB1_FALSE@am__objects_3 = lib_a-strlen.$(OBJEXT)
 @HAVE_THUMB1_TRUE@@OPT_SIZE_TRUE@am__objects_3 =  \
@@ -226,13 +228,15 @@ noinst_LIBRARIES = lib.a
 @HAVE_ARMV7_TRUE@MEMCHR_SRC = memchr.S
 @HAVE_ARMV7_FALSE@MEMCHR_OBJ = 
 @HAVE_ARMV7_TRUE@MEMCHR_OBJ = $(lpfx)memchr.o
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_FALSE@@OPT_SIZE_FALSE@MEMCPY_SRC = 
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_FALSE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_SRC = 
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@OPT_SIZE_FALSE@MEMCPY_SRC = memcpy.S
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_SRC = memcpy.S
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@MEMCPY_SRC = memcpy.S
+@HAVE_ARMV7A_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_SRC = memcpy.S
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@MEMCPY_SRC = memcpy.S
 @OPT_SIZE_TRUE@MEMCPY_SRC = 
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_FALSE@@OPT_SIZE_FALSE@MEMCPY_OBJ = 
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_FALSE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_OBJ = 
-@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@OPT_SIZE_FALSE@MEMCPY_OBJ = $(lpfx)memcpy.o
+@HAVE_ARMV7A_FALSE@@HAVE_ARMV7M_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_OBJ = $(lpfx)memcpy.o
-@HAVE_ARMV7A_TRUE@@OPT_SIZE_FALSE@MEMCPY_OBJ = $(lpfx)memcpy.o
+@HAVE_ARMV7A_TRUE@@HAVE_ARMV8A_FALSE@@OPT_SIZE_FALSE@MEMCPY_OBJ = $(lpfx)memcpy.o
+@HAVE_ARMV8A_TRUE@@OPT_SIZE_FALSE@MEMCPY_OBJ = $(lpfx)memcpy.o
 @OPT_SIZE_TRUE@MEMCPY_OBJ = 
 lib_a_SOURCES = setjmp.S access.c strcmp.S strcpy.c \
 	        $(MEMCPY_SRC) $(MEMCHR_SRC) $(STRLEN_SRC) \

newlib/libc/machine/arm/configure

@@ -567,6 +567,8 @@ LIBOBJS
 CFLAGS
 HAVE_ARMV7M_FALSE
 HAVE_ARMV7M_TRUE
+HAVE_ARMV8A_FALSE
+HAVE_ARMV8A_TRUE
 HAVE_ARMV7A_FALSE
 HAVE_ARMV7A_TRUE
 HAVE_ARMV7_FALSE
@@ -3589,6 +3591,48 @@ else
 fi
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether armv8a processor is supported" >&5
+$as_echo_n "checking whether armv8a processor is supported... " >&6; }
+if ${acnewlib_cv_armv8a_processor+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.c <<EOF
+
+#if defined (__ARM_ARCH_8A__) && defined (__ARM_FEATURE_UNALIGNED)
+  #define HAVE_ARMV8A
+ #else
+  #error "ARMV8A is not supported."
+#endif
+int main () {
+  return 0;
+}
+EOF
+if { ac_try='${CC} $CFLAGS $CPPFLAGS -c -o conftest.o conftest.c
+							1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then
+  acnewlib_cv_armv8a_processor=yes;
+else
+  acnewlib_cv_armv8a_processor=no;
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $acnewlib_cv_armv8a_processor" >&5
+$as_echo "$acnewlib_cv_armv8a_processor" >&6; }
+
+ if test x"$acnewlib_cv_armv8a_processor" = x"yes"; then
+  HAVE_ARMV8A_TRUE=
+  HAVE_ARMV8A_FALSE='#'
+else
+  HAVE_ARMV8A_TRUE='#'
+  HAVE_ARMV8A_FALSE=
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether armv7m processor is supported" >&5
 $as_echo_n "checking whether armv7m processor is supported... " >&6; }
 if ${acnewlib_cv_armv7m_processor+:} false; then :
@@ -3837,6 +3881,10 @@ if test -z "${HAVE_ARMV7A_TRUE}" && test -z "${HAVE_ARMV7A_FALSE}"; then
   as_fn_error $? "conditional \"HAVE_ARMV7A\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${HAVE_ARMV8A_TRUE}" && test -z "${HAVE_ARMV8A_FALSE}"; then
+  as_fn_error $? "conditional \"HAVE_ARMV8A\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${HAVE_ARMV7M_TRUE}" && test -z "${HAVE_ARMV7M_FALSE}"; then
   as_fn_error $? "conditional \"HAVE_ARMV7M\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5

newlib/libc/machine/arm/configure.in

@@ -111,6 +111,31 @@ rm -f conftest*])
 
 AM_CONDITIONAL(HAVE_ARMV7A, test x"$acnewlib_cv_armv7a_processor" = x"yes")
 
+dnl Check for whether ARM_ARCH_8A is defined.
+AC_CACHE_CHECK(whether armv8a processor is supported,
+	       acnewlib_cv_armv8a_processor, [dnl
+cat > conftest.c <<EOF
+
+#if defined (__ARM_ARCH_8A__) && defined (__ARM_FEATURE_UNALIGNED)
+  #define HAVE_ARMV8A
+ #else
+  #error "ARMV8A is not supported."
+#endif
+int main () {
+  return 0;
+}
+EOF
+if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -c -o conftest.o conftest.c
+							1>&AS_MESSAGE_LOG_FD])
+then
+  acnewlib_cv_armv8a_processor=yes;
+else
+  acnewlib_cv_armv8a_processor=no;
+fi
+rm -f conftest*])
+
+AM_CONDITIONAL(HAVE_ARMV8A, test x"$acnewlib_cv_armv8a_processor" = x"yes")
+
 dnl Check for whether ARM_ARCH_7M is defined.
 AC_CACHE_CHECK(whether armv7m processor is supported,
 	       acnewlib_cv_armv7m_processor, [dnl

newlib/libc/machine/arm/memcpy.S

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 ARM Ltd
+ * Copyright (c) 2013-2015 ARM Ltd
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,7 +40,8 @@
      lib_a-memcpy.o to be generated.
   */
 
-#elif defined (__ARM_ARCH_7A__) && defined (__ARM_FEATURE_UNALIGNED)
+#elif (__ARM_ARCH >= 7 && __ARM_ARCH_PROFILE == 'A' \
+       && defined (__ARM_FEATURE_UNALIGNED))
 #include "memcpy-armv7a.S"
 
 #elif defined (__ARM_ARCH_7M__) || defined (__ARM_ARCH_7EM__)