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Revision 139c0683

Parent f9556d33
Child dc4b5c42

Added by Iustin Pop about 11 years ago

Remove read instances from our Haskell code

It turns out that optimising 'read' derived instances (via -O) for
complex data types (like OpCode, or the various objects) can be slow
to very slow. Disabling such instances results in (time make
$all_our_haskell_binaries) large compile-time savings and also smaller
(unstripped) binaries (by a significant amount):

ghc 6.12: time htools sz hconfd sz
with read: 4m50s 12,244,694 14,927,928
no read: 3m30s 10,234,305 12,536,745
ghc 7.6:
with read: 14m45s 13,694,761 15,741,755
no read: 3m40s 11,631,373 13,245,134

So let's remove these instances, since we never use read in production
for our custom types, and even when debugging in GHCI, we can simply
use the 'show' representation to create the types, without needing to
actually parse from strings.

Note: for the very slow ghc 7.6 compilation time, I filled a ticket
(ghc #7450), since it is surprising(ly slow).

Signed-off-by: Iustin Pop <>
Reviewed-by: Michele Tartara <>


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