[PATCH] dce: Use FOR_EACH_IMM_USE_FAST instead of FOR_EACH_IMM_USE_STMT in simple_dce_from_worklist

[Andrew Pinski]

When I wrote this code I forgot about FOR_EACH_IMM_USE_FAST. Since this code 
does not change
any of the uses inside of the loop using FOR_EACH_IMM_USE_FAST will be slightly 
faster.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

        * tree-ssa-dce.cc (simple_dce_from_worklist): Use FOR_EACH_IMM_USE_FAST 
instead of
        FOR_EACH_IMM_USE_STMT.

Signed-off-by: Andrew Pinski <andrew.pin...@oss.qualcomm.com>
---
 gcc/tree-ssa-dce.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-ssa-dce.cc b/gcc/tree-ssa-dce.cc
index 53bbd7584fd..317a0d6179b 100644
--- a/gcc/tree-ssa-dce.cc
+++ b/gcc/tree-ssa-dce.cc
@@ -2378,12 +2378,13 @@ simple_dce_from_worklist (bitmap worklist, bitmap 
need_eh_cleanup)
          if (gimple_code (def_stmt) != GIMPLE_PHI)
            continue;
 
-         gimple *use_stmt;
          imm_use_iterator use_iter;
+         use_operand_p use_p;
          bool canremove = true;
 
-         FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, def)
+         FOR_EACH_IMM_USE_FAST (use_p, use_iter, def)
            {
+             gimple *use_stmt = USE_STMT (use_p);
              /* Ignore debug statements. */
              if (is_gimple_debug (use_stmt))
                continue;
-- 
2.43.0