patch applied (ghc): Make record selection look cheap
Simon Peyton Jones
simonpj at microsoft.com
Wed Sep 6 15:25:08 EDT 2006
Wed Sep 6 04:52:42 PDT 2006 simonpj at microsoft.com
* Make record selection look cheap
exprIsCheap was already making record selection look cheap, esp for
dictionary selection; e.g.
The idea is to allow those record selections to migrate inside a
lambda, because on the whole it's more expensive to share than
But sometimes dictionary selection is nested; e.g.
(==) ($p1Num dNum)
This turned out to make a (fragile) rewrite rule fire a little
more robustly, but it seems like a good idea in any case.
This patch makes nested record selections also look cheap.
M ./compiler/coreSyn/CoreUtils.lhs -1 +1
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