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7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64

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Revert changes which caused regression.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-09-09 13:47:11 -07:00
parent 67ba51cae8
commit 92b2b44b18
1 changed files with 32 additions and 23 deletions

55
hotspot/src/share/vm/opto/loopnode.cpp

@ -582,20 +582,25 @@ bool PhaseIdealLoop::is_counted_loop( Node *x, IdealLoopTree *loop ) {
// Build a canonical trip test.
// Clone code, as old values may be in use.
Node* nphi = PhiNode::make(x, init_trip, TypeInt::INT);
nphi = _igvn.register_new_node_with_optimizer(nphi);
set_ctrl(nphi, get_ctrl(phi));
incr = incr->clone();
incr->set_req(1,nphi);
incr->set_req(1,phi);
incr->set_req(2,stride);
incr = _igvn.register_new_node_with_optimizer(incr);
set_early_ctrl( incr );
_igvn.hash_delete(phi);
phi->set_req_X( LoopNode::LoopBackControl, incr, &_igvn );
nphi->set_req(LoopNode::LoopBackControl, incr);
_igvn.replace_node(phi, nphi);
phi = nphi->as_Phi();
// If phi type is more restrictive than Int, raise to
// Int to prevent (almost) infinite recursion in igvn
// which can only handle integer types for constants or minint..maxint.
if (!TypeInt::INT->higher_equal(phi->bottom_type())) {
Node* nphi = PhiNode::make(phi->in(0), phi->in(LoopNode::EntryControl), TypeInt::INT);
nphi->set_req(LoopNode::LoopBackControl, phi->in(LoopNode::LoopBackControl));
nphi = _igvn.register_new_node_with_optimizer(nphi);
set_ctrl(nphi, get_ctrl(phi));
_igvn.replace_node(phi, nphi);
phi = nphi->as_Phi();
}
cmp = cmp->clone();
cmp->set_req(1,incr);
cmp->set_req(2,limit);
@ -1618,8 +1623,6 @@ void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) {
Node *phi = cl->phi();
int stride_con = cl->stride_con();
PhaseGVN *gvn = &_igvn;
// Visit all children, looking for Phis
for (DUIterator i = cl->outs(); cl->has_out(i); i++) {
Node *out = cl->out(i);
@ -1655,25 +1658,31 @@ void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) {
int ratio_con = stride_con2/stride_con;
if ((ratio_con * stride_con) == stride_con2) { // Check for exact
#ifndef PRODUCT
if (TraceLoopOpts) {
tty->print("Parallel IV: %d ", phi2->_idx);
loop->dump_head();
}
#endif
// Convert to using the trip counter. The parallel induction
// variable differs from the trip counter by a loop-invariant
// amount, the difference between their respective initial values.
// It is scaled by the 'ratio_con'.
// Perform local Ideal transformation since in most cases ratio == 1.
Node* ratio = _igvn.intcon(ratio_con);
set_ctrl(ratio, C->root());
Node* hook = new (C, 3) Node(3);
Node* ratio_init = gvn->transform(new (C, 3) MulINode(init, ratio));
hook->init_req(0, ratio_init);
Node* diff = gvn->transform(new (C, 3) SubINode(init2, ratio_init));
hook->init_req(1, diff);
Node* ratio_idx = gvn->transform(new (C, 3) MulINode(phi, ratio));
hook->init_req(2, ratio_idx);
Node* add = gvn->transform(new (C, 3) AddINode(ratio_idx, diff));
set_subtree_ctrl(add);
Node* ratio_init = new (C, 3) MulINode(init, ratio);
_igvn.register_new_node_with_optimizer(ratio_init, init);
set_early_ctrl(ratio_init);
Node* diff = new (C, 3) SubINode(init2, ratio_init);
_igvn.register_new_node_with_optimizer(diff, init2);
set_early_ctrl(diff);
Node* ratio_idx = new (C, 3) MulINode(phi, ratio);
_igvn.register_new_node_with_optimizer(ratio_idx, phi);
set_ctrl(ratio_idx, cl);
Node* add = new (C, 3) AddINode(ratio_idx, diff);
_igvn.register_new_node_with_optimizer(add);
set_ctrl(add, cl);
_igvn.replace_node( phi2, add );
// Free up intermediate goo
_igvn.remove_dead_node(hook);
// Sometimes an induction variable is unused
if (add->outcnt() == 0) {
_igvn.remove_dead_node(add);