re PR bootstrap/46474 (powerpc64-linux bootstrap comparison failure in libcpp/symtab.o)

2010-11-15  Richard Guenther  <rguenther@suse.de>

	PR bootstrap/46474
	* tree-ssa-math-opts.c (convert_mult_to_fma): Disregard debug stmts.

From-SVN: r166750

gcc/ChangeLog

+2010-11-15  Richard Guenther  <rguenther@suse.de>
+
+	PR bootstrap/46474
+	* tree-ssa-math-opts.c (convert_mult_to_fma): Disregard debug stmts.
+
 2010-11-15  Nick Clifton  <nickc@redhat.com>
 
 	* config/stormy16/stormy16.c (direct_return): Do not generate a

gcc/tree-ssa-math-opts.c

@@ -1534,6 +1534,9 @@ convert_mult_to_fma (gimple mul_stmt)
 
       use_stmt = USE_STMT (use_p);
 
+      if (is_gimple_debug (use_stmt))
+	continue;
+
       /* For now restrict this operations to single basic blocks.  In theory
 	 we would want to support sinking the multiplication in
 	 m = a*b;
@@ -1603,10 +1606,14 @@ convert_mult_to_fma (gimple mul_stmt)
   FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, mul_result)
     {
       gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt);
-      enum tree_code use_code = gimple_assign_rhs_code (use_stmt);
+      enum tree_code use_code;
       tree addop, mulop1, result = mul_result;
       bool negate_p = false;
 
+      if (is_gimple_debug (use_stmt))
+	continue;
+
+      use_code = gimple_assign_rhs_code (use_stmt);
       if (use_code == NEGATE_EXPR)
 	{
 	  result = gimple_assign_lhs (use_stmt);