JDK-6784930 : server jvm fails with assert(!n->is_SpillCopy(),"") in -Xcomp mode with fastdebug bits
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: hs11
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2008-12-14
  • Updated: 2011-03-08
  • Resolved: 2011-03-08
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JDK 6 JDK 7 Other
6u14Fixed 7Fixed hs14Fixed
Related Reports
Relates :  
JDK-6812721 - Block's frequency should not be NaN
Description
server jvm fails with assertion (!n->is_SpillCopy(),"") in -Xcomp mode with fastdebug bits (both 2 and 64 bits) on all platforms.
Comments
EVALUATION The fix has been verified as part of hs15-b02 pit.
24-02-2009
SUGGESTED FIX Set minimum block frequency MIN_BLOCK_FREQUENCY 1.e-35f. Add the assert to check a block frequency.
13-01-2009
PUBLIC COMMENTS The LRG's _area value 0. is used by RA to avoid additional splits of a spill copy which has one immediately following use. But _area value 0. could be also produced if a block has frequency 0. caused by a long chain of conditional branches with small probability P <= 0.1 so that a float value underflow. As result all LRGs in such blocks have the same high score 1e35 and RA can not make progress producing a lot of spill copies. Solution: Set minimum block frequency MIN_BLOCK_FREQUENCY 1.e-35f. Add the assert to check a block frequency.
13-01-2009
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/011517bbcd7b
13-01-2009