#4441: NCG miscompiles Double -> Float -> Double
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Reporter: dterei | Owner: dterei
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (NCG) | Version: 7.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: x86 | Failure: Incorrect result at runtime
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Comment(by simonmar):
Are you sure this is the same bug? On x86 there are often floating-point
differences between `-fasm` and `-fvia-C`, due to the difference in
precision between x87 registers (80 bits) and in-memory values (32 or
64-bits). Try using `-fasm` with `-msse2` to get more consistent results,
or `-fvia-C` with `-fexcess-precision` to get inconsistent results with
the C backend.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4441#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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