[gcc r12-7245] vect: Fix early free

[Richard Sandiford]

https://gcc.gnu.org/g:63a9328cb8c601377fe73e214b708c4ae0441847

commit r12-7245-g63a9328cb8c601377fe73e214b708c4ae0441847
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Tue Feb 15 18:09:33 2022 +0000

    vect: Fix early free
    
    When updating the target costs interface, I failed to move the
    free of the scalar costs beyond the new last use.
    
    gcc/
            * tree-vect-slp.cc (vect_bb_vectorization_profitable_p): Fix
            use after free.

Diff:
---
 gcc/tree-vect-slp.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index e2cc7218c2b..273543d37ea 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -5380,7 +5380,6 @@ vect_bb_vectorization_profitable_p (bb_vec_info bb_vinfo,
       unsigned dummy;
       finish_cost (scalar_target_cost_data, nullptr,
 		   &dummy, &scalar_cost, &dummy);
-      delete scalar_target_cost_data;
 
       /* Complete the target-specific vector cost calculation.  */
       class vector_costs *vect_target_cost_data = init_cost (bb_vinfo, false);
@@ -5393,6 +5392,7 @@ vect_bb_vectorization_profitable_p (bb_vec_info bb_vinfo,
 	     && li_vector_costs[vi].first == vl);
       finish_cost (vect_target_cost_data, scalar_target_cost_data,
 		   &vec_prologue_cost, &vec_inside_cost, &vec_epilogue_cost);
+      delete scalar_target_cost_data;
       delete vect_target_cost_data;
 
       vec_outside_cost = vec_prologue_cost + vec_epilogue_cost;