Improve the tree builder in IR optimisation. Allow load expressions to be
moved past Put/I statements and dirty helpers, when it is safe to do so.
It is safe, when the statement does not require exact memory exceptions.
New functions stmt_modifies_guest_state and dirty_helper_puts have been
added to determine the side effect on the guest state.
This optimisation enables the use of memory-to-memory insns on
architectures that have those.
git-svn-id: svn://svn.valgrind.org/vex/trunk@2645 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_main.c b/priv/main_main.c
index 2304d5a..baa573a 100644
--- a/priv/main_main.c
+++ b/priv/main_main.c
@@ -724,7 +724,7 @@
/* Turn it into virtual-registerised code. Build trees -- this
also throws away any dead bindings. */
- max_ga = ado_treebuild_BB( irsb );
+ max_ga = ado_treebuild_BB( irsb, preciseMemExnsFn );
if (vta->finaltidy) {
irsb = vta->finaltidy(irsb);