src/share/vm/opto/loopTransform.cpp
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*** old/src/share/vm/opto/loopTransform.cpp Wed Nov 19 23:23:52 2014
--- new/src/share/vm/opto/loopTransform.cpp Wed Nov 19 23:23:52 2014
*** 270,283 ****
--- 270,282 ----
// Return TRUE or FALSE if the loop should be peeled or not. Peel if we can
// make some loop-invariant test (usually a null-check) happen before the loop.
bool IdealLoopTree::policy_peeling( PhaseIdealLoop *phase ) const {
Node *test = ((IdealLoopTree*)this)->tail();
int body_size = ((IdealLoopTree*)this)->_body.size();
int live_node_count = phase->C->live_nodes();
// Peeling does loop cloning which can result in O(N^2) node construction
if( body_size > 255 /* Prevent overflow for large body_size */
! || (body_size * body_size + live_node_count > MaxNodeLimit) ) {
! || (body_size * body_size + phase->C->live_nodes()) > phase->C->max_node_limit() ) {
return false; // too large to safely clone
}
while( test != _head ) { // Scan till run off top of loop
if( test->is_If() ) { // Test?
Node *ctrl = phase->get_ctrl(test->in(1));
*** 602,612 ****
--- 601,611 ----
uint tst_body_size = (new_body_size - EMPTY_LOOP_SIZE) / trip_count + EMPTY_LOOP_SIZE;
if (body_size != tst_body_size) // Check for int overflow
return false;
if (new_body_size > unroll_limit ||
// Unrolling can result in a large amount of node construction
! new_body_size >= MaxNodeLimit - (uint) phase->C->live_nodes()) {
! new_body_size >= phase->C->max_node_limit() - phase->C->live_nodes()) {
return false;
}
// Do not unroll a loop with String intrinsics code.
// String intrinsics are large and have loops.
*** 2279,2290 ****
--- 2278,2289 ----
}
}
// Skip next optimizations if running low on nodes. Note that
// policy_unswitching and policy_maximally_unroll have this check.
! uint nodes_left = MaxNodeLimit - (uint) phase->C->live_nodes();
! if ((2 * _body.size()) > nodes_left) {
! int nodes_left = phase->C->max_node_limit() - phase->C->live_nodes();
! if ((int)(2 * _body.size()) > nodes_left) {
return true;
}
// Counted loops may be peeled, may need some iterations run up
// front for RCE, and may want to align loop refs to a cache
src/share/vm/opto/loopTransform.cpp
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