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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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11
hotspot/src/share/vm/c1/c1_Optimizer.cpp
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@ -178,7 +178,7 @@ void CE_Eliminator::block_do(BlockBegin* block) {
// 2) substitute conditional expression
// with an IfOp followed by a Goto
// cut if_ away and get node before
Instruction* cur_end = if_->prev(block);
Instruction* cur_end = if_->prev();
// append constants of true- and false-block if necessary
// clone constants because original block must not be destroyed
@ -202,7 +202,7 @@ void CE_Eliminator::block_do(BlockBegin* block) {
}
// append Goto to successor
ValueStack* state_before = if_->is_safepoint() ? if_->state_before() : NULL;
ValueStack* state_before = if_->state_before();
Goto* goto_ = new Goto(sux, state_before, if_->is_safepoint() || t_goto->is_safepoint() || f_goto->is_safepoint());
// prepare state for Goto
@ -367,10 +367,11 @@ class BlockMerger: public BlockClosure {
#endif
// find instruction before end & append first instruction of sux block
Instruction* prev = end->prev(block);
Instruction* prev = end->prev();
Instruction* next = sux->next();
assert(prev->as_BlockEnd() == NULL, "must not be a BlockEnd");
prev->set_next(next);
prev->fixup_block_pointers();
sux->disconnect_from_graph();
block->set_end(sux->end());
// add exception handlers of deleted block, if any
@ -533,6 +534,8 @@ public:
void do_ProfileInvoke (ProfileInvoke* x);
void do_RuntimeCall (RuntimeCall* x);
void do_MemBar (MemBar* x);
void do_RangeCheckPredicate(RangeCheckPredicate* x);
void do_Assert (Assert* x);
};
@ -714,6 +717,8 @@ void NullCheckVisitor::do_ProfileCall (ProfileCall* x) { nce()->clear_las
void NullCheckVisitor::do_ProfileInvoke (ProfileInvoke* x) {}
void NullCheckVisitor::do_RuntimeCall (RuntimeCall* x) {}
void NullCheckVisitor::do_MemBar (MemBar* x) {}
void NullCheckVisitor::do_RangeCheckPredicate(RangeCheckPredicate* x) {}
void NullCheckVisitor::do_Assert (Assert* x) {}
void NullCheckEliminator::visit(Value* p) {