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6384206: Phis which are later unneeded are impairing our ability to inline based on static types

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Reviewed-by: rasbold, jrose
This commit is contained in:
Tom Rodriguez 2008-09-17 12:59:52 -07:00
parent eee15b163e
commit 4b1e242299
18 changed files with 1082 additions and 401 deletions
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25
hotspot/src/share/vm/opto/parse.hpp
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@ -167,9 +167,19 @@ class Parse : public GraphKit {
int start() const { return flow()->start(); }
int limit() const { return flow()->limit(); }
int pre_order() const { return flow()->pre_order(); }
int rpo() const { return flow()->rpo(); }
int start_sp() const { return flow()->stack_size(); }
bool is_loop_head() const { return flow()->is_loop_head(); }
bool is_SEL_head() const { return flow()->is_single_entry_loop_head(); }
bool is_SEL_backedge(Block* pred) const{ return is_SEL_head() && pred->rpo() >= rpo(); }
bool is_invariant_local(uint i) const {
const JVMState* jvms = start_map()->jvms();
if (!jvms->is_loc(i)) return false;
return flow()->is_invariant_local(i - jvms->locoff());
}
bool can_elide_SEL_phi(uint i) const { assert(is_SEL_head(),""); return is_invariant_local(i); }
const Type* peek(int off=0) const { return stack_type_at(start_sp() - (off+1)); }
const Type* stack_type_at(int i) const;
@ -305,7 +315,7 @@ class Parse : public GraphKit {
// entry_bci() -- see osr_bci, etc.
ciTypeFlow* flow() const { return _flow; }
// blocks() -- see pre_order_at, start_block, etc.
// blocks() -- see rpo_at, start_block, etc.
int block_count() const { return _block_count; }
GraphKit& exits() { return _exits; }
@ -330,12 +340,12 @@ class Parse : public GraphKit {
// Must this parse be aborted?
bool failing() { return C->failing(); }
Block* pre_order_at(int po) {
assert(0 <= po && po < _block_count, "oob");
return &_blocks[po];
Block* rpo_at(int rpo) {
assert(0 <= rpo && rpo < _block_count, "oob");
return &_blocks[rpo];
}
Block* start_block() {
return pre_order_at(flow()->start_block()->pre_order());
return rpo_at(flow()->start_block()->rpo());
}
// Can return NULL if the flow pass did not complete a block.
Block* successor_for_bci(int bci) {
@ -359,9 +369,6 @@ class Parse : public GraphKit {
// Parse all the basic blocks.
void do_all_blocks();
// Helper for do_all_blocks; makes one pass in pre-order.
void visit_blocks();
// Parse the current basic block
void do_one_block();