#7116: Missing optimisation: strength reduction of floating-point multiplication
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Reporter: simonmar | Owner:
Type: bug | Status: patch
Priority: normal | Milestone: 7.8.1
Component: Compiler | Version: 7.4.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Runtime performance bug | Unknown/Multiple
Test Case: | Difficulty: Unknown
Blocking: | Blocked By:
| Related Tickets:
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Comment (by simonmar):
jstolarek: the ticket is about doing the optimisation for floating-point
multiplication, not integer. We don't want to do it for integer
operations, because it's better to do this in the code generator (the only
reason for doing it in the simplifier would be to enable further
simplifications, but that isn't the case here).
Furthermore, we definitely want to optimise integer multiplication at the
Cmm level, because the Stg->Cmm code generator and later stages may create
opportunities for this optimisation.
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7116#comment:7>
GHC <http://www.haskell.org/ghc/>
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