#5615: ghc produces poor code for `div` with constant powers of 2.
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Reporter: Lennart | Owner: daniel.is.fischer
Type: bug | Status: new
Priority: normal | Milestone: 7.6.1
Component: Compiler | Version: 7.2.1
Keywords: | Os: Unknown/Multiple
Architecture: x86 | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonmar):
I think I was hoping that we'd be able to do it without a built-in rule,
since the backends already turn constant divisions into shifts (and LLVM
probably has a range of more sophisticated translations). If only
`divInt#` was inlined, it would just work.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5615#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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