-O causing a 7x slowdown (Map of IORef's)

Good afternoon,

the attached program is about 7 times slower when compiled
_with_ -O using ghc 6.4. Using ghc 6.2.1 with ddata's Map gives
the same behaviour.

Happy hacking,
Remi


% make

ghc --make -no-recomp    Main.hs -o nor
Chasing modules from: Main.hs
Compiling Main             ( Main.hs, Main.o )
Linking ...

ghc --make -no-recomp -O Main.hs -o opt
Chasing modules from: Main.hs
Compiling Main             ( Main.hs, Main.o )
Linking ...

time -p ./nor
real 1.77
user 1.75
sys 0.00

time -p ./opt
real 13.05
user 12.45
sys 0.06

-- 
Nobody can be exactly like me. Even I have trouble doing it.

Main.hs
Description: Text document

Makefile
Description: Text document

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