- do_jump (build2 (BIT_AND_EXPR, argtype, arg,
- fold (build2 (LSHIFT_EXPR, argtype,
- one, shift))),
- if_false_label, if_true_label);
- break;
+ clr_label = if_false_label;
+ set_label = if_true_label;
+ }
+
+ if (TREE_CODE (exp0) == RSHIFT_EXPR)
+ {
+ tree arg = TREE_OPERAND (exp0, 0);
+ tree shift = TREE_OPERAND (exp0, 1);
+ tree argtype = TREE_TYPE (arg);
+ if (TREE_CODE (shift) == INTEGER_CST
+ && compare_tree_int (shift, 0) >= 0
+ && compare_tree_int (shift, HOST_BITS_PER_WIDE_INT) < 0
+ && prefer_and_bit_test (TYPE_MODE (argtype),
+ TREE_INT_CST_LOW (shift)))
+ {
+ HOST_WIDE_INT mask = (HOST_WIDE_INT) 1
+ << TREE_INT_CST_LOW (shift);
+ do_jump (build2 (BIT_AND_EXPR, argtype, arg,
+ build_int_cst_type (argtype, mask)),
+ clr_label, set_label);
+ break;
+ }