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bug#5754: Bytecomp Arithmetic test failed
From: |
Eli Zaretskii |
Subject: |
bug#5754: Bytecomp Arithmetic test failed |
Date: |
Sun, 04 Apr 2010 09:25:10 +0300 |
> From: Chong Yidong <cyd@stupidchicken.com>
> Date: Sat, 03 Apr 2010 18:40:59 -0400
> Cc: 5754@debbugs.gnu.org
>
> The key is that if I compile Emacs with CFLAGS="-g", then
>
> (funcall
> (byte-compile
> (list 'lambda nil
> (quote (let ((a (expt 2 -1074)) (b 0.125)) (* a 8 b))))))
>
> returns 0.0. If I compile Emacs with CFLAGS="-g -O2", then it returns
> 5e-324.
>
> It looks like this may be a compiler bug.
I doubt it. I see this in GCC 3.4.x; the chances that two very
different versions have the same bug are less than slim, I think.
I'd suspect some bug in our code, before considering a GCC bug.