6667581: Don't generate initialization (by 0) code for arrays with size 0
Summary: generate_arraycopy() does not check the size of allocated array.
Reviewed-by: jrose, never
--- a/hotspot/src/share/vm/opto/library_call.cpp Fri Feb 29 09:57:18 2008 -0800
+++ b/hotspot/src/share/vm/opto/library_call.cpp Fri Feb 29 11:22:27 2008 -0800
@@ -4170,6 +4170,7 @@
&& !_gvn.eqv_uncast(src, dest)
&& ((alloc = tightly_coupled_allocation(dest, slow_region))
!= NULL)
+ && _gvn.find_int_con(alloc->in(AllocateNode::ALength), 1) > 0
&& alloc->maybe_set_complete(&_gvn)) {
// "You break it, you buy it."
InitializeNode* init = alloc->initialization();