--- old/src/share/vm/opto/gcm.cpp	2014-02-19 12:01:33.532301630 +0100
+++ new/src/share/vm/opto/gcm.cpp	2014-02-19 12:01:33.420301625 +0100
@@ -1661,10 +1661,10 @@
   }
   assert (_members.length() > 0, "no empty loops");
   Block* hd = head();
-  hd->_freq = 1.0f;
+  hd->_freq = 1.0;
   for (int i = 0; i < _members.length(); i++) {
     CFGElement* s = _members.at(i);
-    float freq = s->_freq;
+    double freq = s->_freq;
     if (s->is_block()) {
       Block* b = s->as_Block();
       for (uint j = 0; j < b->_num_succs; j++) {
@@ -1676,7 +1676,7 @@
       assert(lp->_parent == this, "immediate child");
       for (int k = 0; k < lp->_exits.length(); k++) {
         Block* eb = lp->_exits.at(k).get_target();
-        float prob = lp->_exits.at(k).get_prob();
+        double prob = lp->_exits.at(k).get_prob();
         update_succ_freq(eb, freq * prob);
       }
     }
@@ -1688,7 +1688,7 @@
   // inner blocks do not get erroneously scaled.
   if (_depth != 0) {
     // Total the exit probabilities for this loop.
-    float exits_sum = 0.0f;
+    double exits_sum = 0.0f;
     for (int i = 0; i < _exits.length(); i++) {
       exits_sum += _exits.at(i).get_prob();
     }
@@ -1935,7 +1935,7 @@
 //------------------------------update_succ_freq-------------------------------
 // Update the appropriate frequency associated with block 'b', a successor of
 // a block in this loop.
-void CFGLoop::update_succ_freq(Block* b, float freq) {
+void CFGLoop::update_succ_freq(Block* b, double freq) {
   if (b->_loop == this) {
     if (b == head()) {
       // back branch within the loop
@@ -1976,11 +1976,11 @@
 // Scale frequency of loops and blocks by trip counts from outer loops
 // Do a top down traversal of loop tree (visit outer loops first.)
 void CFGLoop::scale_freq() {
-  float loop_freq = _freq * trip_count();
+  double 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;
+    double block_freq = s->_freq * loop_freq;
     if (g_isnan(block_freq) || block_freq < MIN_BLOCK_FREQUENCY)
       block_freq = MIN_BLOCK_FREQUENCY;
     s->_freq = block_freq;
@@ -1993,7 +1993,7 @@
 }
 
 // Frequency of outer loop
-float CFGLoop::outer_loop_freq() const {
+double CFGLoop::outer_loop_freq() const {
   if (_child != NULL) {
     return _child->_freq;
   }
@@ -2042,7 +2042,7 @@
       k = 0;
     }
     Block *blk = _exits.at(i).get_target();
-    float prob = _exits.at(i).get_prob();
+    double prob = _exits.at(i).get_prob();
     tty->print(" ->%d@%d%%", blk->_pre_order, (int)(prob*100));
   }
   tty->print("\n");