Very poor constant folding
GHC seems to lack constant folding for encodeFloat/decodeFloat. For many examples, compile the numeric-limits package on hackage, or just this snippet:
epsilon :: Double
epsilon = r
where r = 1 - encodeFloat (m-1) e
(m, e) = decodeFloat (1 `asTypeOf` r)
This has a very simple value, but GHC refuses to compute it at compile time. This in turn inhibits other constant folding that should be going on.
Trac metadata
Trac field | Value |
---|---|
Version | 7.4.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
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Blocking | |
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Operating system | |
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