Non-cheap primop is duplicated
Conal Elliot writes: I have
exampleC :: Double -> Double -> Double
exampleC = \ t -> let s = sin t in \ x -> x + s
But the sin
ends up being pushed inside the lambda by the optimiser, like so:
exampleC = \ t x -> x + sin t
So if I do map (exampleC v) xs
I end up computing sin v
once for each element of xs
rather than once.
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |