#3561: Incorrect code generation on x86
-----------------------------+----------------------------------------------
Reporter: aleksey | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.4 | Severity: major
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: x86
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This program prints "0" on x86 with ghc-6.10.4 and "-O" optimization at
least under Linux and FreeBSD:
{{{
main = print $ pqr' 0 1
pqr' :: Int -> Int -> Integer
pqr' a b | a == b - 1 = rab
| otherwise = ram * rmb
where m = (a + b) `div` 2
ram = pqr' a m
rmb = pqr' m b
rab = toInteger (6 * b - 5) * toInteger (2 * b - 1) *
toInteger (6 * b - 1)
}}}
It prints the correct value "5" with either "-O0", or "-fvia-C", or on
x86_64.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3561>
GHC <http://www.haskell.org/ghc/>
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