[Bug c++/44069] optimization bug initializing from cast array

[kraftche at cae dot wisc dot edu]

------- Comment #2 from kraftche at cae dot wisc dot edu  2010-05-11 00:29 -------
Subject: Re:  optimization bug initializing from cast array

On 05/10/2010 07:22 PM, pinskia at gcc dot gnu dot org wrote:
> ------- Comment #1 from pinskia at gcc dot gnu dot org  2010-05-11 00:22 -------
> The problem is that you are reading past the array (vals[0]).
>
>

I don't think that I am.  Or rather, I understand that I am reading off 
the end of the first row of a 2D array, but not past the end of the 
entire 2D array.  It is fairly common when combining C and C++ code to 
assume things such about the memory layout of an array.  For example 
that the array rows are consecutive in memory such that reading one 
position past the end of the first row of a 2D array is equivalent to 
reading the first element of the second row.  And it works fine with 
without optimization.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44069