--- a/hotspot/src/share/vm/opto/memnode.cpp Thu Mar 06 10:55:28 2014 -0800
+++ b/hotspot/src/share/vm/opto/memnode.cpp Thu Mar 06 11:12:45 2014 -0800
@@ -1593,35 +1593,33 @@
// Try to constant-fold a stable array element.
static const Type* fold_stable_ary_elem(const TypeAryPtr* ary, int off, BasicType loadbt) {
+ assert(ary->const_oop(), "array should be constant");
assert(ary->is_stable(), "array should be stable");
- if (ary->const_oop() != NULL) {
- // Decode the results of GraphKit::array_element_address.
- ciArray* aobj = ary->const_oop()->as_array();
- ciConstant con = aobj->element_value_by_offset(off);
-
- if (con.basic_type() != T_ILLEGAL && !con.is_null_or_zero()) {
- const Type* con_type = Type::make_from_constant(con);
- if (con_type != NULL) {
- if (con_type->isa_aryptr()) {
- // Join with the array element type, in case it is also stable.
- int dim = ary->stable_dimension();
- con_type = con_type->is_aryptr()->cast_to_stable(true, dim-1);
- }
- if (loadbt == T_NARROWOOP && con_type->isa_oopptr()) {
- con_type = con_type->make_narrowoop();
- }
+ // Decode the results of GraphKit::array_element_address.
+ ciArray* aobj = ary->const_oop()->as_array();
+ ciConstant con = aobj->element_value_by_offset(off);
+
+ if (con.basic_type() != T_ILLEGAL && !con.is_null_or_zero()) {
+ const Type* con_type = Type::make_from_constant(con);
+ if (con_type != NULL) {
+ if (con_type->isa_aryptr()) {
+ // Join with the array element type, in case it is also stable.
+ int dim = ary->stable_dimension();
+ con_type = con_type->is_aryptr()->cast_to_stable(true, dim-1);
+ }
+ if (loadbt == T_NARROWOOP && con_type->isa_oopptr()) {
+ con_type = con_type->make_narrowoop();
+ }
#ifndef PRODUCT
- if (TraceIterativeGVN) {
- tty->print("FoldStableValues: array element [off=%d]: con_type=", off);
- con_type->dump(); tty->cr();
- }
+ if (TraceIterativeGVN) {
+ tty->print("FoldStableValues: array element [off=%d]: con_type=", off);
+ con_type->dump(); tty->cr();
+ }
#endif //PRODUCT
- return con_type;
- }
+ return con_type;
}
}
-
return NULL;
}
@@ -1641,7 +1639,7 @@
// Try to guess loaded type from pointer type
if (tp->isa_aryptr()) {
const TypeAryPtr* ary = tp->is_aryptr();
- const Type *t = ary->elem();
+ const Type* t = ary->elem();
// Determine whether the reference is beyond the header or not, by comparing
// the offset against the offset of the start of the array's data.
@@ -1653,10 +1651,9 @@
const bool off_beyond_header = ((uint)off >= (uint)min_base_off);
// Try to constant-fold a stable array element.
- if (FoldStableValues && ary->is_stable()) {
- // Make sure the reference is not into the header
- if (off_beyond_header && off != Type::OffsetBot) {
- assert(adr->is_AddP() && adr->in(AddPNode::Offset)->is_Con(), "offset is a constant");
+ if (FoldStableValues && ary->is_stable() && ary->const_oop() != NULL) {
+ // Make sure the reference is not into the header and the offset is constant
+ if (off_beyond_header && adr->is_AddP() && off != Type::OffsetBot) {
const Type* con_type = fold_stable_ary_elem(ary, off, memory_type());
if (con_type != NULL) {
return con_type;