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7153771: array bound check elimination for c1

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When possible optimize out array bound checks, inserting predicates when needed.

Reviewed-by: never, kvn, twisti
This commit is contained in:
Thomas Wuerthinger 2013-03-21 09:27:54 +01:00 • committed by Roland Westrelin
parent 2f4ecb86a2
commit 06ef4cddf7
40 changed files with 2861 additions and 153 deletions
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12
hotspot/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp
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@ -263,7 +263,7 @@ void LIRGenerator::store_stack_parameter (LIR_Opr item, ByteSize offset_from_sp)
void LIRGenerator::do_StoreIndexed(StoreIndexed* x) {
assert(x->is_pinned(),"");
bool needs_range_check = true;
bool needs_range_check = x->compute_needs_range_check();
bool use_length = x->length() != NULL;
bool obj_store = x->elt_type() == T_ARRAY || x->elt_type() == T_OBJECT;
bool needs_store_check = obj_store && (x->value()->as_Constant() == NULL ||
@ -278,12 +278,10 @@ void LIRGenerator::do_StoreIndexed(StoreIndexed* x) {
array.load_item();
index.load_nonconstant();
if (use_length) {
needs_range_check = x->compute_needs_range_check();
if (needs_range_check) {
length.set_instruction(x->length());
length.load_item();
}
if (use_length && needs_range_check) {
length.set_instruction(x->length());
length.load_item();
}
if (needs_store_check) {
value.load_item();