#15304: Huge increase of compile time and memory use from 8.0.2 to 8.2.2 or 8.4.2
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Reporter: NathanWaivio | Owner: tdammers
Type: bug | Status: new
Priority: high | Milestone: 8.6.1
Component: Compiler | Version: 8.4.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture: x86_64
Type of failure: Compile-time | (amd64)
performance bug | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by tdammers):
Sounds like a promising lead, if not the key to figuring this out.
Worker/wrapper is generally a good thing to do; in theory, all it should
do is turn arguments to recursive function calls closures, thus reducing
the argument-passing overhead. But I can imagine that this would also get
in the way of inlinings and `RULES`.
So what we're looking for is code that follows the pattern that makes it a
candidate for worker/wrapper optimization (parameters passed through
recursive calls unchanged), such that the worker/wrapper optimization
breaks up expressions that might otherwise trigger useful inlinings or
rewrites.
--
Ticket URL: <
http://ghc.haskell.org/trac/ghc/ticket/15304#comment:17>
GHC <
http://www.haskell.org/ghc/>
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