dc hitting a compiler bug, or undefined behavior

[Ralf Friedl]

Lauri Kasanen wrote:
> On Mon, Mar 31, 2014, at 0:37, Ralf Friedl wrote:
>> Are you using some special compiler options, especially regarding
>> parameter passing in registers and stack alignment?
> None, I'm afraid. CFLAGS etc are all unset. See later on for the gcc
> defaults too.
>
> Thanks for the research. I only speak x86 asm on a "yep, that's asm"
> level.
>
>> The instruction at 12 loads the double from address %edi after %edi has
>> been set to point to the parameter area. The instruction at 0 in the
>> failed case is exactly the same, except that %edi has not been setup
>> before. So I would consider this a compiler bug.
> Would it be possible for you to submit a gcc bug? I can try to do so
> too, but it'll take a (long) while before I have time to build latest
> gcc to test.
And if they ask what to do to reproduce the bug then I answer that I 
don't know. Besides I don't know whether 4.7.1 is still in development. 
They might ask whether an update to 4.7.3 or 4.8.2 solves the problem.