[erlang-patches] Serge's ei float patch

Björn-Egil Dahlberg <>
Mon May 31 17:30:39 CEST 2010

On 2010-05-31 16:42, Steve Vinoski wrote:
> 2010/5/31 Björn-Egil Dahlberg<>:
>>   - Distribution flags, the DFLAG_NEW_FLOATS option should be enabled in
>>    lib/erl_interface/src/connect/ei_connect.c: static int
>> send_name_or_challenge.
>>    See lib/erl_interface/src/connect/ei_connect_int.h and
>> lib/kernel/src/dist.hrl for some details.
> Does the recv_challenge function in ei_connect.c need to verify that
> DFLAG_NEW_FLOATS is set in the flags, treating it as an error if not
> set (e.g. the same way DFLAG_EXTENDED_REFERENCES is handled)?

Right, need to ponder on that one. Should newer erl_interface be able to 
handle ancient erts? Well, it can't since encode_double will always 
encode with the new float. Hence yes, give them an error and let them 
upgrade erlang.

This will be incompatible with releases before R12B.

>> Anyway, with DFLAGS_NEW_FLOATS flag enabled the code would be tested as well
>> which is a necessity in order for it to be included in the otp relase.
> Which tests would exercise the DFLAGS_NEW_FLOATS flag?
> Note that the code already submitted in this patch is definitely
> tested by the erl_interface ei_print suite, since tests there were
> failing with just the original R12B-2 patch.

Perhaps that is what I saw in code coverage. I see now that for some 
vxworks reason the match_float is commented in the ei_encode/decode 
suites. It shouldn't be.


> thanks,
> --steve
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