[Bug target/56897] unaligned memory access on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56897

--- Comment #7 from Uros Bizjak <ubizjak at gmail dot com> 2013-04-16 15:15:14 UTC ---
(In reply to comment #4)
> Hi,
> 
> (In reply to comment #3)
> > Please create a self-sufficient executable testcase, following the instructions
> > at [1]. I was not able to confirm the problem from the lines you posted.
> 
> Thanks for the feedback, Uros.  Did you try it together with the frame 
> growing downwards diff posted in #56898?  If so, the locals are actually
> at the negative offsets and unaligned loads like foo%8-5 will expose this,
> instead of foo%8-1.

No, I am using unpatched compiler. Compiling your ab-pre.tgz test, I got:

~/gcc-build-47/gcc/xgcc -B ~/gcc-build-47/gcc -O a.c
uros@monolith ~/test $ ./a.out
0d0a
0d0a0401
0d0a0401

~/gcc-build-47/gcc/xgcc -B ~/gcc-build-47/gcc -O -mcpu=ev4 a.c
uros@monolith ~/test $ ./a.out
0d0a
0d0a0401
0d0a0401

with:

GNU C (GCC) version 4.7.3 20130228 (prerelease) [gcc-4_7-branch revision
196343] (alphaev68-unknown-linux-gnu)

and the same result (with the same flags) with:

GNU C (GCC) version 4.9.0 20130407 (experimental) [trunk revision 197551]
(alphaev68-unknown-linux-gnu)

The compilers imply -mcpu=ev67 when invoked without -mcpu command.