[Qemu-devel] [RFC][PATCH v2 4/4] configure: add CONFIG_QEMU_LDST_OPTIMIZATION for TCG qemu_ld/st optimization

[Yeongkyoon Lee]

Add an option "--enable-ldst-optimization" to enable 
CONFIG_QEMU_LDST_OPTIMIZATION macro for TCG qemu_ld/st optimization. It only 
works with CONFIG_SOFTMMU and doesn't work with CONFIG_TCG_PASS_AREG0.

Signed-off-by: Yeongkyoon Lee <address@hidden>
---
 configure |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 9f071b7..2b364cc 100755
--- a/configure
+++ b/configure
@@ -171,6 +171,7 @@ bsd="no"
 linux="no"
 solaris="no"
 profiler="no"
+ldst_optimization="no"
 cocoa="no"
 softmmu="yes"
 linux_user="no"
@@ -714,6 +715,8 @@ for opt do
   ;;
   --enable-profiler) profiler="yes"
   ;;
+  --enable-ldst-optimization) ldst_optimization="yes"
+  ;;
   --disable-cocoa) cocoa="no"
   ;;
   --enable-cocoa)
@@ -3463,6 +3466,11 @@ echo "EXESUF=$EXESUF" >> $config_host_mak
 echo "LIBS_QGA+=$libs_qga" >> $config_host_mak
 echo "POD2MAN=$POD2MAN" >> $config_host_mak
 
+if [ "$ldst_optimization" = "yes" -a "$cpu" != "i386" -a "$cpu" != "x86_64" ] 
; then
+  echo "ERROR: qemu_ld/st optimization is only available on i386 or x86_64 
hosts"
+  exit 1
+fi
+
 # generate list of library paths for linker script
 
 $ld --verbose -v 2> /dev/null | grep SEARCH_DIR > ${config_host_ld}
@@ -3696,11 +3704,18 @@ fi
 symlink "$source_path/Makefile.target" "$target_dir/Makefile"
 
 
+target_ldst_optimization="$ldst_optimization"
+
 case "$target_arch2" in
   alpha | sparc* | xtensa* | ppc*)
     echo "CONFIG_TCG_PASS_AREG0=y" >> $config_target_mak
+    # qemu_ld/st optimization is not available with CONFIG_TCG_PASS_AREG0
+    target_ldst_optimization="no"
   ;;
 esac
+if [ "$target_ldst_optimization" = "yes" -a "$target_softmmu" = "yes" ] ; then
+    echo "CONFIG_QEMU_LDST_OPTIMIZATION=y" >> $config_target_mak
+fi
 
 echo "TARGET_SHORT_ALIGNMENT=$target_short_alignment" >> $config_target_mak
 echo "TARGET_INT_ALIGNMENT=$target_int_alignment" >> $config_target_mak
-- 
1.7.4.1