From 1ab478a7ce281f7cdce01df2fe04953c0770fdbc Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Mon, 19 Mar 2018 19:13:29 +0100
Subject: erl_interface: Optimize latin1_to_utf8 and friend

to do word wise check/copy for pure ASCII
if ARCH allows it (x86 and amd64).
---
 lib/erl_interface/configure.in | 92 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

(limited to 'lib/erl_interface/configure.in')

diff --git a/lib/erl_interface/configure.in b/lib/erl_interface/configure.in
index 0a8fbf513c..7cc1f1f89a 100644
--- a/lib/erl_interface/configure.in
+++ b/lib/erl_interface/configure.in
@@ -106,6 +106,98 @@ if test $ac_cv_sizeof_long = 8; then
   CFLAGS="$CFLAGS -DEI_64BIT"
 fi
 
+dnl
+dnl Determine target hardware in ARCH
+dnl
+AC_MSG_CHECKING([target hardware architecture])
+if test "x$host_alias" != "x" -a "x$host_cpu" != "x"; then
+    chk_arch_=$host_cpu
+else
+    chk_arch_=`uname -m`
+fi
+
+case $chk_arch_ in
+    sun4u)	ARCH=ultrasparc;;
+    sparc64)	ARCH=sparc64;;
+    sun4v)	ARCH=ultrasparc;;
+    i86pc)	ARCH=x86;;
+    i386)	ARCH=x86;;
+    i486)	ARCH=x86;;
+    i586)	ARCH=x86;;
+    i686)	ARCH=x86;;
+    x86_64)	ARCH=amd64;;
+    amd64)	ARCH=amd64;;
+    macppc)	ARCH=ppc;;
+    powerpc)	ARCH=ppc;;
+    ppc)	ARCH=ppc;;
+    ppc64)	ARCH=ppc64;;
+    ppc64le)	ARCH=ppc64le;;
+    "Power Macintosh")	ARCH=ppc;;
+    armv5b)	ARCH=arm;;
+    armv5teb)	ARCH=arm;;
+    armv5tel)	ARCH=arm;;
+    armv5tejl)	ARCH=arm;;
+    armv6l)	ARCH=arm;;
+    armv6hl)	ARCH=arm;;
+    armv7l)	ARCH=arm;;
+    armv7hl)	ARCH=arm;;
+    tile)	ARCH=tile;;
+    *)	 	ARCH=noarch;;
+esac
+AC_MSG_RESULT($ARCH)
+
+dnl
+dnl Convert between x86 and amd64 based on the compiler's mode.
+dnl Ditto between ultrasparc and sparc64.
+dnl
+AC_MSG_CHECKING(whether compilation mode forces ARCH adjustment)
+case "$ARCH-$ac_cv_sizeof_void_p" in
+    x86-8)
+	AC_MSG_RESULT(yes: adjusting ARCH=x86 to ARCH=amd64)
+	ARCH=amd64
+	;;
+    amd64-4)
+	AC_MSG_RESULT(yes: adjusting ARCH=amd64 to ARCH=x86)
+	ARCH=x86
+	;;
+    ultrasparc-8)
+	AC_MSG_RESULT(yes: adjusting ARCH=ultrasparc to ARCH=sparc64)
+	ARCH=sparc64
+	;;
+    sparc64-4)
+	AC_MSG_RESULT(yes: adjusting ARCH=sparc64 to ARCH=ultrasparc)
+	ARCH=ultrasparc
+	;;
+    ppc64-4)
+	AC_MSG_RESULT(yes: adjusting ARCH=ppc64 to ARCH=ppc)
+	ARCH=ppc
+	;;
+    ppc-8)
+	AC_MSG_RESULT(yes: adjusting ARCH=ppc to ARCH=ppc64)
+	ARCH=ppc64
+	;;
+    arm-8)
+	AC_MSG_RESULT(yes: adjusting ARCH=arm to ARCH=noarch)
+	ARCH=noarch
+	;;
+    *)
+	AC_MSG_RESULT(no: ARCH is $ARCH)
+	;;
+esac
+
+AC_SUBST(ARCH)
+
+AC_MSG_CHECKING(for unaligned word access)
+case "$ARCH" in
+    x86|amd64)
+	AC_MSG_RESULT(yes: x86 or amd64)
+	AC_DEFINE(HAVE_UNALIGNED_WORD_ACCESS, 1, [Define if hw supports unaligned word access])
+	;;
+    *)
+	AC_MSG_RESULT(no)
+	;;
+esac
+
 AC_CHECK_TOOL(AR, ar, false)
 if test "$AR" = false; then
   AC_MSG_ERROR([No 'ar' command found in PATH])
-- 
cgit v1.2.3