#2080: Bug in CmmOpt
-------------------------+--------------------------------------------------
Reporter: simonmar | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Compiler | Version: 6.8.2
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
-------------------------+--------------------------------------------------
Two bugs are demonstrated by the following code. The first one is wrong
code generated for the comparison, and the second is the panic (see the
comment):
{{{
module Test where
import GHC.Base
utf8DecodeChar# :: Addr# -> Bool -> Bool
{-# NOINLINE utf8DecodeChar# #-}
utf8DecodeChar# a# fred =
case () of
_ | word2Int# (indexWord8OffAddr# a# 0#) <=# 0x7F# -> True
-- Omitting the next line gives an ASSERT error:
-- ghc-6.9: panic! (the 'impossible' happened)
-- (GHC version 6.9 for x86_64-unknown-linux):
-- ASSERT failed! file nativeGen/MachCodeGen.hs line 1049
-- %MO_S_Le_I8(I8[R2], 127 :: I8)
| fred -> True
| otherwise -> False
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2080>
GHC <http://www.haskell.org/ghc/>
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