JDK-7080431 : VM asserts if specified size(x) in .ad is larger than emitted size
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: hs22
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2011-08-18
  • Updated: 2011-11-25
  • Resolved: 2011-09-30
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JDK 7 Other
7u2Fixed hs22Fixed
Related Reports
Relates :  
JDK-7063629 - use cbcond in C2 generated code on T4
Description
It was allowed to specify larger size(x) in mach node definition in .ad file than actual emitted instruction size. It was treated as upper bound on instruction size. 7063629 changes broke that, it requires size(x) in mach node definition match the emitted size which reduced flexibility in C2 development.
Comments
EVALUATION See main CR
12-09-2011
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-rt/hotspot/rev/739a9abbbd4b
23-08-2011
PUBLIC COMMENTS It was allowed to specify larger size(x) in mach node definition in .ad file than actual emitted instruction size. It was treated as upper bound on instruction size. 7063629 changes broke that, it requires size(x) in mach node definition match the emitted size which reduced flexibility in C2 development. Move code from finalize_offsets_and_shorten() to fill_buffer() to restore previous behavior. Also move call to mcall->size(_regalloc) after mcall->method_set(mcall->entry_point()) since destination could be far and requires more code.
18-08-2011
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-comp/hotspot/rev/739a9abbbd4b
18-08-2011