re PR tree-optimization/57027 (ICE in gimple_assign_rhs_code, at gimple.h:2022)

2013-05-03  Joern Rennecke <joern.rennecke@embecosm.com>

        PR tree-optimization/57027
        * tree-ssa-math-opts.c (convert_mult_to_fma): When checking for
        fnms opportunity, check we got the prerequisite kind of tree / gimple
        before using accessor functions.

From-SVN: r198577

gcc/ChangeLog

+2013-05-03  Joern Rennecke <joern.rennecke@embecosm.com>
+
+	PR tree-optimization/57027
+	* tree-ssa-math-opts.c (convert_mult_to_fma): When checking
+	for fnms opportunity, check we got the prerequisite kind
+	of tree / gimple before using accessor functions.
+
 2013-05-03  Richard Biener  <rguenther@suse.de>
 
 	* double-int.h (lshift): New overload without precision

gcc/tree-ssa-math-opts.c

@@ -2581,12 +2581,16 @@ convert_mult_to_fma (gimple mul_stmt, tree op1, tree op2)
 	  && optab_handler (fnma_optab, TYPE_MODE (type)) != CODE_FOR_nothing)
 	{
 	  tree rhs2 = gimple_assign_rhs2 (use_stmt);
-	  gimple stmt2 = SSA_NAME_DEF_STMT (rhs2);
 
+	  if (TREE_CODE (rhs2) == SSA_NAME)
+	    {
+	      gimple stmt2 = SSA_NAME_DEF_STMT (rhs2);
 	      if (has_single_use (rhs2)
+		  && is_gimple_assign (stmt2)
 		  && gimple_assign_rhs_code (stmt2) == MULT_EXPR)
 	      return false;
 	    }
+	}
 
       /* We can't handle a * b + a * b.  */
       if (gimple_assign_rhs1 (use_stmt) == gimple_assign_rhs2 (use_stmt))