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6810845: Performance regression in mpegaudio on x64

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Used the outer loop frequency in frequencies checks in RA.

Reviewed-by: never, twisti
This commit is contained in:
Vladimir Kozlov 2009-03-26 15:04:55 -07:00
parent 3b786f8edc
commit 68cf08d2c3
7 changed files with 30 additions and 4 deletions
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12
hotspot/src/share/vm/opto/gcm.cpp
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@ -1374,6 +1374,9 @@ void PhaseCFG::Estimate_Block_Frequency() {
_root_loop->_freq = 1.0;
_root_loop->scale_freq();
// Save outmost loop frequency for LRG frequency threshold
_outer_loop_freq = _root_loop->outer_loop_freq();
// force paths ending at uncommon traps to be infrequent
if (!C->do_freq_based_layout()) {
Block_List worklist;
@ -1898,6 +1901,7 @@ bool CFGLoop::in_loop_nest(Block* b) {
// Do a top down traversal of loop tree (visit outer loops first.)
void CFGLoop::scale_freq() {
float loop_freq = _freq * trip_count();
_freq = loop_freq;
for (int i = 0; i < _members.length(); i++) {
CFGElement* s = _members.at(i);
float block_freq = s->_freq * loop_freq;
@ -1912,6 +1916,14 @@ void CFGLoop::scale_freq() {
}
}
// Frequency of outer loop
float CFGLoop::outer_loop_freq() const {
if (_child != NULL) {
return _child->_freq;
}
return _freq;
}
#ifndef PRODUCT
//------------------------------dump_tree--------------------------------------
void CFGLoop::dump_tree() const {