Re: [Chicken-janitors] #910: Failure with many arguments on amd64

[Chicken Trac]

#910: Failure with many arguments on amd64
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  Reporter:  sjamaan         |       Owner:  felix 
      Type:  defect          |      Status:  closed
  Priority:  critical        |   Milestone:  4.9.0 
 Component:  core libraries  |     Version:  4.8.x 
Resolution:  worksforme      |    Keywords:        
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Changes (by sjamaan):

  * status:  assigned => closed
  * resolution:  => worksforme


Comment:

 After diving in deeper, all signs point towards a GCC bug. When the
 function is entered, the assembly prologue generated by GCC jumps to an
 address which gets %al added to it (?).  According to the ABI
 documentation, %al holds the number of saved SSE registers.  However, the
 value of %al is completely out of whack and has largish negative values
 (it should be a number between 0 and 8).

 As Christian and Mario did not run into any crashes with GCC 4.7, I tried
 upgrading as well (I was running 4.5).  With GCC 4.8, everything worked
 just fine!

 Finally, Christian and Mario did report running into crashes with larger
 argument counts, but that's almost definitely due to the temporary stack
 overflowing, like Felix theorised above.  I think adding an extra check
 there won't hurt, but at least this ticket itself is bogus.

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/910#comment:10>
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