[PATCH] Fix ICE in vectorizable_store ().

[Kirill Yukhin]

Hello Richard,
On 15 Jan 12:54, Richard Biener wrote:
> On Fri, 15 Jan 2016, Kirill Yukhin wrote:
> 
> > Hello,
> > Thet patch in the bottom adds check if rhs is "useless_type_conversion_p"
> > in vectorizable_store () to avoid subsequent gcc_assert.
> > 
> > This change is very similar to [1].
> > 
> > Bootstrapped & regtest in progress.
> > 
> > Is it ok for main trunk if regtest pass?
> 
> Ok, but please add a testcase that is fixed.
I've updated the patch to allow RHSes w/o vectypes (like from built-ins)
And now bootstrap & regtest show no issues.

Unfortunatelly, this issue arised on huge Fortran workload (POP2)
only w/ LTO and I was unable to extract a case from it (spent few hours though).

So, may be this patch is acceptable w/o reg test?

--
Thanks, K

> 
> Thanks,
> Richard.
> 
> > gcc/
> > 	* tree-vect-stmts.c (vectorizable_store): Check
> > 	rhs vectype.
> > 
> > 
> > [1] - https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01551.html
> > 
> > --
> > Thanks, K
> > 

diff --git b/gcc/tree-vect-stmts.c a/gcc/tree-vect-stmts.c
index 872fa07..2aaa335 100644
--- b/gcc/tree-vect-stmts.c
+++ a/gcc/tree-vect-stmts.c
@@ -5282,7 +5282,7 @@ vectorizable_store (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
 
   gcc_assert (gimple_assign_single_p (stmt));
 
-  tree vectype = STMT_VINFO_VECTYPE (stmt_info);
+  tree vectype = STMT_VINFO_VECTYPE (stmt_info), rhs_vectype = NULL_TREE;
   unsigned int nunits = TYPE_VECTOR_SUBPARTS (vectype);
 
   if (loop_vinfo)
@@ -5308,7 +5308,8 @@ vectorizable_store (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
     }
 
   op = gimple_assign_rhs1 (stmt);
-  if (!vect_is_simple_use (op, vinfo, &def_stmt, &dt))
+
+  if (!vect_is_simple_use (op, vinfo, &def_stmt, &dt, &rhs_vectype))
     {
       if (dump_enabled_p ())
         dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
@@ -5316,6 +5317,9 @@ vectorizable_store (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
       return false;
     }
 
+  if (rhs_vectype && !useless_type_conversion_p (vectype, rhs_vectype))
+    return false;
+
   elem_type = TREE_TYPE (vectype);
   vec_mode = TYPE_MODE (vectype);