[ ghc-Bugs-818425 ] Bad sparc Int64 code via NCG with -O

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Bugs item #818425, was opened at 2003-10-06 04:10
Message generated for change (Comment added) made by simonmar
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Category: Compiler (NCG)
Group: 6.0.1
Status: Open
Resolution: None
>Priority: 3
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bad sparc Int64 code via NCG with -O

Initial Comment:
On sparc machines ( sparc-sun-solaris2.6,
sparc-unknown-openbsd ) testsuite tests exercising
Int64 code are broken when compiled the optasm way.
This includes the arith011 test and the enum02 test,
possibly others. Trivial Int64 code will produce
erroneous results. Turning off optimisation, or
compiling via C, will generate correct code. 

Some examples.. 

This one comes from enum02:

  import Int
  main = do print $ pred (1 :: Int64)

$ ./a.out 
  4294967295

which is UINT_MAX...
And from arith011, this generates incorrect results:

  import Int
  main = do print $ take 10 [ (0::Int64), toEnum 2 .. ]

on x86:
   [0,2,4]
on sparc:
   [0,8589934592,17179869184]

which is 2 * (UNIT_MAX + 1), and then twice that.
This erroneously generates an infinte sequence, filling
up /usr on my system before I realised what happened:

  import Int
  main = do print [ (0::Int64) .. toEnum 2 ]

-- Don Stewart

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>Comment By: Simon Marlow (simonmar)
Date: 2004-12-17 09:42

Message:
Logged In: YES 
user_id=48280

Lowering priority; the native code generator in 6.4 doesn't
support sparc any more.  Any volunteers?

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