A small program Main.hs compiled with -O runs 10 times faster or
slower depending on the export list
module Main (main)
or module Main (main,test)
Is this a bug?
Please, tell me, how to make -O work in ghc-2.08-i386-all-linux ?
I am trying -O in Makefile for some critical modules of certain
large project, but cannot predict when this occures useful.
The only result so far is this small program in Main.hs which exports
only `main'.
First, I decided to omit -O at all; then met occasionally this 10
times acceleration and thought it worths trying ...
In ghc-0.29 the performance for -O was predictable.
What I work now with is the binary snapshot ghc-2.08-i386-all-linux
by S.Panne. But maybe, this is common for all ghc-2.08 ?
May it help to build ghc from sources (not so simple for 20Mbyte RAM)
?
Another question:
does it worth to set things like {-# inline 0 f #-} or
{-# inline 1 f #-}
- has ghc -c -O (2.08 or future) to be clever enough to guess
what to inline?
Thank you in advance.
------------------
Sergey Mechveliani
[EMAIL PROTECTED]
