#2416: Optimization defeated by merging module into main
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Reporter: sedillard | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.8.3
Severity: normal | Resolution:
Keywords: | Testcase:
Architecture: x86_64 (amd64) | Os: Linux
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Comment (by sedillard):
The main reason Main.hs is so much faster is this:
{{{
ghc --make Main.hs -O2 -fexcess-precision -ddump-simpl | grep D#
[1 of 2] Compiling TheModule ( TheModule.hs, TheModule.o )
[2 of 2] Compiling Main ( Main.hs, Main.o )
Linking Main ...
(no hits)
}}}
There are no calls D# in the compiled Main.hs, whereas Both.hs ends up
with many D# constructors in the main loop.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2416#comment:1>
GHC <http://www.haskell.org/ghc/>
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