#3744: Comparisons against minBound/maxBound not optimised
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Reporter: rl | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.0.1
Component: Compiler | Version: 6.13
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Runtime performance bug
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Comment(by rl):
I don't think these rules would work reliably because the comparison
operators could (and would) be inlined before the rules have had a chance
to fire. Rules for specific primitive types wouldn't have this problem but
IIRC, matching against the actual bounds literals can be problematic.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3744#comment:4>
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