#3034: divInt# floated into a position which leads to low arity
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Reporter: batterseapower | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Comment (by twhitehead):
For some reason, using quot instead of div produces the desired code.
This is despite quotInt# not being cheap according to ghci 6.10.1
Prelude> PrimOp.primOpIsCheap PrimOp.IntQuotOp
False
Maybe it has something to do with there being a primitive IntQuotOp but
not a corresponding IntDivOp (tidy core gives GHC.Prim.quotInt# versus
GHC.Base.divInt#)
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3034#comment:2>
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