Mercurial > hg > truffle

diff src/share/vm/opto/gcm.cpp @ 673:fbc12e71c476
6810845: Performance regression in mpegaudio on x64 Summary: Used the outer loop frequency in frequencies checks in RA. Reviewed-by: never, twisti
author: kvn
date: Thu, 26 Mar 2009 15:04:55 -0700
parents: 7bb995fbd3c0
children: fbde8ec322d0
--- a/src/share/vm/opto/gcm.cpp	Thu Mar 26 14:39:39 2009 -0700
+++ b/src/share/vm/opto/gcm.cpp	Thu Mar 26 15:04:55 2009 -0700
@@ -1374,6 +1374,9 @@
   _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 @@
 // 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 @@
   }
 }
 
+// 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 {