[Bug tree-optimization/49093] [4.6/4.7 Regression] ICE in vect_enhance_data_refs_alignment() with volatile inside peeled loop

[irar at il dot ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49093

Ira Rosen <irar at il dot ibm.com> changed:

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                 CC|                            |irar at il dot ibm.com

--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-05-31 07:31:02 UTC 
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The problem here is that
vol.2_8 ={v} g_324[g_97_22];
is skipped during determination of the vectorization factor, because it has no
uses. The vf is set to 4, and then the analysis fails on the char data-ref.

I think we should just not vectorize when there is a volatile access in a loop.
Is that reasonable?

Thanks,
Ira