From: Julian Seward <jseward@acm.org>
Date: Fri, 25 Oct 2013 06:27:19 +0000 (+0000)
Subject: Merge, from trunk, r13688: move host code closer to generate code to
X-Git-Tag: svn/VALGRIND_3_9_0~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c26740dc6d21d23b5c16f0310269e7e5ad915c3c;p=thirdparty%2Fvalgrind.git

Merge, from trunk, r13688: move host code closer to generate code to
improve branch predictor performance.


git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_9_BRANCH@13695
---

diff --git a/configure.ac b/configure.ac
index d9acbc1199..35647444f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -564,9 +564,10 @@ case "$ARCH_MAX-$VGCONF_OS" in
         VGCONF_ARCH_SEC=""
         VGCONF_PLATFORM_PRI_CAPS="S390X_LINUX"
         VGCONF_PLATFORM_SEC_CAPS=""
-        # we want to have the generated code close to the dispatcher
-        valt_load_address_pri_norml="0x401000000"
-        valt_load_address_pri_inner="0x410000000"
+        # To improve branch prediction hit rate we want to have
+        # the generated code close to valgrind (host) code
+        valt_load_address_pri_norml="0x800000000"
+        valt_load_address_pri_inner="0x810000000"
         valt_load_address_sec_norml="0xUNSET"
         valt_load_address_sec_inner="0xUNSET"
         AC_MSG_RESULT([ok (${ARCH_MAX}-${VGCONF_OS})])