+class pass_optimize_bswap : public gimple_opt_pass
+{
+public:
+ pass_optimize_bswap (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_optimize_bswap, ctxt)
+ {}
+
+ /* opt_pass methods: */
+ bool gate () { return gate_optimize_bswap (); }
+ unsigned int execute () { return execute_optimize_bswap (); }
+
+}; // class pass_optimize_bswap
+
+} // anon namespace
+
+gimple_opt_pass *
+make_pass_optimize_bswap (gcc::context *ctxt)
+{
+ return new pass_optimize_bswap (ctxt);
+}
+
+/* Return true if stmt is a type conversion operation that can be stripped
+ when used in a widening multiply operation. */
+static bool
+widening_mult_conversion_strippable_p (tree result_type, gimple stmt)
+{
+ enum tree_code rhs_code = gimple_assign_rhs_code (stmt);
+
+ if (TREE_CODE (result_type) == INTEGER_TYPE)
+ {
+ tree op_type;
+ tree inner_op_type;
+
+ if (!CONVERT_EXPR_CODE_P (rhs_code))
+ return false;
+
+ op_type = TREE_TYPE (gimple_assign_lhs (stmt));
+
+ /* If the type of OP has the same precision as the result, then
+ we can strip this conversion. The multiply operation will be
+ selected to create the correct extension as a by-product. */
+ if (TYPE_PRECISION (result_type) == TYPE_PRECISION (op_type))
+ return true;
+
+ /* We can also strip a conversion if it preserves the signed-ness of
+ the operation and doesn't narrow the range. */
+ inner_op_type = TREE_TYPE (gimple_assign_rhs1 (stmt));
+
+ /* If the inner-most type is unsigned, then we can strip any
+ intermediate widening operation. If it's signed, then the
+ intermediate widening operation must also be signed. */
+ if ((TYPE_UNSIGNED (inner_op_type)
+ || TYPE_UNSIGNED (op_type) == TYPE_UNSIGNED (inner_op_type))
+ && TYPE_PRECISION (op_type) > TYPE_PRECISION (inner_op_type))
+ return true;
+
+ return false;
+ }
+
+ return rhs_code == FIXED_CONVERT_EXPR;
+}
+
projects / platform / upstream / gcc.git / blobdiff