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6784930: server jvm fails with assert(!n->is_SpillCopy(),"")

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Set minimum block frequency MIN_BLOCK_FREQUENCY 1.e-35f.

Reviewed-by: never, rasbold
This commit is contained in:
Vladimir Kozlov 2009-01-13 11:10:00 -08:00
parent 1ff1bdc3e6
commit 78f5dc395e
1 changed files with 13 additions and 1 deletions
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14
hotspot/src/share/vm/opto/gcm.cpp
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@ -29,6 +29,9 @@
#include "incls/_precompiled.incl" #include "incls/_precompiled.incl"
#include "incls/_gcm.cpp.incl" #include "incls/_gcm.cpp.incl"
// To avoid float value underflow
#define MIN_BLOCK_FREQUENCY 1.e-35f
//----------------------------schedule_node_into_block------------------------- //----------------------------schedule_node_into_block-------------------------
// Insert node n into block b. Look for projections of n and make sure they // Insert node n into block b. Look for projections of n and make sure they
// are in b also. // are in b also.
@ -1380,6 +1383,13 @@ void PhaseCFG::Estimate_Block_Frequency() {
} }
} }
#ifdef ASSERT
for (uint i = 0; i < _num_blocks; i++ ) {
Block *b = _blocks[i];
assert(b->_freq >= MIN_BLOCK_FREQUENCY, "Register Allocator requiers meaningful block frequency");
}
#endif
#ifndef PRODUCT #ifndef PRODUCT
if (PrintCFGBlockFreq) { if (PrintCFGBlockFreq) {
tty->print_cr("CFG Block Frequencies"); tty->print_cr("CFG Block Frequencies");
@ -1877,7 +1887,9 @@ void CFGLoop::scale_freq() {
float loop_freq = _freq * trip_count(); float loop_freq = _freq * trip_count();
for (int i = 0; i < _members.length(); i++) { for (int i = 0; i < _members.length(); i++) {
CFGElement* s = _members.at(i); CFGElement* s = _members.at(i);
s->_freq *= loop_freq; float block_freq = s->_freq * loop_freq;
if (block_freq < MIN_BLOCK_FREQUENCY) block_freq = MIN_BLOCK_FREQUENCY;
s->_freq = block_freq;
} }
CFGLoop* ch = _child; CFGLoop* ch = _child;
while (ch != NULL) { while (ch != NULL) {