[PATCH] Fix PR59951

[Richard Biener]

This fixes PR59951, a debug-compare failure where we didn't disregard
uses in debug stmts when accounting for SLP uses outside of the slp.

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

Richard.

2014-01-30  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/59951
        * tree-vect-slp.c (vect_bb_slp_scalar_cost): Skip uses in debug
        insns.

Index: gcc/tree-vect-slp.c
===================================================================
*** gcc/tree-vect-slp.c (revision 207238)
--- gcc/tree-vect-slp.c (working copy)
*************** vect_bb_slp_scalar_cost (basic_block bb,
*** 1967,1975 ****
          imm_use_iterator use_iter;
          gimple use_stmt;
          FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, DEF_FROM_PTR (def_p))
!           if (gimple_code (use_stmt) == GIMPLE_PHI
!               || gimple_bb (use_stmt) != bb
!               || !STMT_VINFO_VECTORIZABLE (vinfo_for_stmt (use_stmt)))
              {
                (*life)[i] = true;
                BREAK_FROM_IMM_USE_STMT (use_iter);
--- 1967,1976 ----
          imm_use_iterator use_iter;
          gimple use_stmt;
          FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, DEF_FROM_PTR (def_p))
!           if (!is_gimple_debug (use_stmt)
!               && (gimple_code (use_stmt) == GIMPLE_PHI
!                   || gimple_bb (use_stmt) != bb
!                   || !STMT_VINFO_VECTORIZABLE (vinfo_for_stmt (use_stmt))))
              {
                (*life)[i] = true;
                BREAK_FROM_IMM_USE_STMT (use_iter);