[GHC] #867: Integer arithmetic gives the wrong answer on amd64/Linux

GHC trac at galois.com
Wed Sep 27 21:20:23 EDT 2006


#867: Integer arithmetic gives the wrong answer on amd64/Linux
-----------------------+----------------------------------------------------
  Reporter:  igloo     |          Owner:                
      Type:  bug       |         Status:  closed        
  Priority:  normal    |      Milestone:                
 Component:  Compiler  |        Version:  6.4.1         
  Severity:  normal    |     Resolution:  fixed         
  Keywords:            |             Os:  Linux         
Difficulty:  Unknown   |   Architecture:  x86_64 (amd64)
-----------------------+----------------------------------------------------
Changes (by igloo):

  * resolution:  => fixed
  * status:  new => closed

Comment:

 Fixed by:
 {{{
 Thu Sep 28 01:48:06 BST 2006  Ian Lynagh <igloo at earth.li>
   * Fix mulIntMayOflo on 64-bit arches; fixes trac #867
   We were assuming we could multiply 2 32-bit numbers without overflowing
   a 64-bit number, but we can't as the top bit is the sign bit.
 }}}
 Test is arith019.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/867>
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