#5954: Performance regression 7.0 -> 7.2 (still in 7.4)
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Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: high | Milestone: 7.4.2
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonmar):
It looks like the simplifer has duplicated some primops. The program is
making more calls to `exp()` at runtime than it was with 7.0. I've spent
some time peering at the Core but it's quite complicated, and I haven't
been able to narrow down the exact bit of problematic code yet. I suggest
we look at it together when you have a chance.
(strong possibility that this is the same as #5623)
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5954#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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