[Bug middle-end/52621] [4.6/4.7/4.8 Regression] ICE with -O3 -march=opteron in initialize_matrix_A, at tree-data-ref.c:1964

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52621

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.4.6, 4.5.3
            Summary|ICE with -O3 -march=opteron |[4.6/4.7/4.8 Regression]
                   |in initialize_matrix_A, at  |ICE with -O3 -march=opteron
                   |tree-data-ref.c:1964        |in initialize_matrix_A, at
                   |                            |tree-data-ref.c:1964

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-03-21 
13:50:34 UTC ---
> I can reproduce it on x86-64-gnu-linux with:
>   gfortran -march=opteron -O3 -w -c file.f
>
> The crucial flag is the "opteron" - it works with "core2".

Confirmed. AFAICT the code compiles with 4.4.6 and 4.5.3 (so marked as a
regression) and on trunk when compiled with '-march=opteron -O2
-ftree-vectorize'.