#2353: GHC inliner doesn't
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
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Changes (by simonpj):
* difficulty: => Unknown
Comment:
GHC deliberately doesn't inline a function, even if there's an INLINE
pragma, if there is nothing "interesting" about the arguments or context.
For example
{{{
f x y = g (h x y)
}}}
Here GHC won't inline `h` even if `h` has an INLINE pragma. Why? Because
doing so just increases code duplication.
However, GHC does take account of context too. If `g` has a RULE, then
`h` will be inlined in case that inlining allows g's RULE to match.
It's possible that even this isn't enough in some circumstances. Perhaps
you have such a case in mind.
But as things stand, it's deliberate.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2353#comment:1>
GHC <http://www.haskell.org/ghc/>
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