tree-ssa.dce.c (eliminate_unnecessary_stmts): Eliminate IFN_GOMP_SIMD_LANE without lhs as useless.

	* tree-ssa.dce.c (eliminate_unnecessary_stmts): Eliminate
	IFN_GOMP_SIMD_LANE without lhs as useless.

From-SVN: r217584

gcc/ChangeLog

 2014-11-14  Jakub Jelinek  <jakub@redhat.com>
 
+	* tree-ssa.dce.c (eliminate_unnecessary_stmts): Eliminate
+	IFN_GOMP_SIMD_LANE without lhs as useless.
+
 	* ipa-pure-const.c (struct funct_state_d): Add can_free field.
 	(varying_state): Add true for can_free.
 	(check_call): For builtin or internal !nonfreeing_call_p set

gcc/tree-ssa-dce.c

@@ -1402,6 +1402,11 @@ eliminate_unnecessary_stmts (void)
 		  maybe_clean_or_replace_eh_stmt (stmt, stmt);
 		  update_stmt (stmt);
 		  release_ssa_name (name);
+
+		  /* GOMP_SIMD_LANE without lhs is not needed.  */
+		  if (gimple_call_internal_p (stmt)
+		      && gimple_call_internal_fn (stmt) == IFN_GOMP_SIMD_LANE)
+		    remove_dead_stmt (&gsi, bb);
 		}
 	      else if (gimple_call_internal_p (stmt))
 		switch (gimple_call_internal_fn (stmt))