[PATCH] Fix vectorizer ICEs with calls with MEM_REF arguments (PR tree-optimization/51485)

[Ira Rosen]

On 9 December 2011 19:08, Jakub Jelinek <jakub@redhat.com> wrote:
> Hi!
>
> As mentioned in the PR, we ICE on the following testcase, because
> there are DRs in a GIMPLE_CALL stmt and when there is just one, we
> compute vectype for the call as if it were a load or store, but during
> computation of vectorization factor we only consider the return value
> of the call.  As such calls are not vectorizable anyway, the following
> patch just gives up on them.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk
> (and with the if (bb_vinfo)/if (gather) parts removed for 4.6 too)?

OK for trunk.

Thanks,
Ira


>
> 2011-12-09  Jakub Jelinek  <jakub@redhat.com>
>
>        PR tree-optimization/51485
>        * tree-vect-data-refs.c (vect_analyze_data_refs): Give up on
>        DRs in call stmts.
>
>        * g++.dg/vect/pr51485.cc: New test.
>
> --- gcc/tree-vect-data-refs.c.jj        2011-12-02 01:52:26.325893329 +0100
> +++ gcc/tree-vect-data-refs.c   2011-12-09 13:27:29.726668859 +0100
> @@ -2896,6 +2896,26 @@ vect_analyze_data_refs (loop_vec_info lo
>           return false;
>         }
>
> +      if (is_gimple_call (stmt))
> +       {
> +         if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS))
> +           {
> +             fprintf (vect_dump, "not vectorized: dr in a call ");
> +             print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
> +           }
> +
> +         if (bb_vinfo)
> +           {
> +             STMT_VINFO_VECTORIZABLE (stmt_info) = false;
> +             stop_bb_analysis = true;
> +             continue;
> +           }
> +
> +         if (gather)
> +           free_data_ref (dr);
> +         return false;
> +       }
> +
>       /* Update DR field in stmt_vec_info struct.  */
>
>       /* If the dataref is in an inner-loop of the loop that is considered for
> --- gcc/testsuite/g++.dg/vect/pr51485.cc.jj     2011-12-09 13:28:45.155281405 +0100
> +++ gcc/testsuite/g++.dg/vect/pr51485.cc        2011-12-09 13:28:57.692205773 +0100
> @@ -0,0 +1,14 @@
> +/* { dg-do compile } */
> +
> +struct A { A (); unsigned int a; };
> +double bar (A a) throw () __attribute__((pure));
> +
> +void
> +foo (unsigned int x, double *y, A *z)
> +{
> +  unsigned int i;
> +  for (i = 0; i < x; i++)
> +    y[i] = bar (z[i]);
> +}
> +
> +/* { dg-final { cleanup-tree-dump "vect" } } */
>
>        Jakub