[PATCH] Fix PR70310

[Richard Biener]

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2016-03-21  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/70310
        * tree-vect-generic.c (expand_vector_condition): Fold the built
        condition.

        * gcc.dg/torture/pr70310.c: New testcase.

Index: gcc/tree-vect-generic.c
===================================================================
*** gcc/tree-vect-generic.c     (revision 234320)
--- gcc/tree-vect-generic.c     (working copy)
*************** expand_vector_condition (gimple_stmt_ite
*** 897,903 ****
        {
          tree aa1 = tree_vec_extract (gsi, comp_inner_type, a1, width, index);
          tree aa2 = tree_vec_extract (gsi, comp_inner_type, a2, width, index);
!         aa = build2 (TREE_CODE (a), cond_type, aa1, aa2);
        }
        else
        aa = tree_vec_extract (gsi, cond_type, a, width, index);
--- 897,903 ----
        {
          tree aa1 = tree_vec_extract (gsi, comp_inner_type, a1, width, index);
          tree aa2 = tree_vec_extract (gsi, comp_inner_type, a2, width, index);
!         aa = fold_build2 (TREE_CODE (a), cond_type, aa1, aa2);
        }
        else
        aa = tree_vec_extract (gsi, cond_type, a, width, index);
Index: gcc/testsuite/gcc.dg/torture/pr70310.c
===================================================================
*** gcc/testsuite/gcc.dg/torture/pr70310.c      (revision 0)
--- gcc/testsuite/gcc.dg/torture/pr70310.c      (working copy)
***************
*** 0 ****
--- 1,20 ----
+ /* { dg-do run } */
+ 
+ typedef unsigned char v32u8 __attribute__ ((vector_size (32)));
+ 
+ unsigned __attribute__((noinline, noclone))
+ foo(unsigned u)
+ {
+   v32u8 v32u8_0 = (v32u8){} > (v32u8){-u};
+   return v32u8_0[31] + v32u8_0[0];
+ }
+ 
+ int
+ main ()
+ {
+   unsigned x = foo(0);
+   __builtin_printf ("%08x\n",x);
+   if (x != 0)
+     __builtin_abort();
+   return 0;
+ }