- arch_register_req_type_none = 0, /**< No register requirement. */
- arch_register_req_type_normal = 1, /**< All registers in the class are allowed. */
- arch_register_req_type_limited = 2, /**< Only a real subset of the class is allowed. */
- arch_register_req_type_should_be_same = 4, /**< The register should be equal to another one at the node. */
- arch_register_req_type_must_be_different = 8, /**< The register must be unequal from some other at the node. */
+ arch_register_req_type_none = 0, /**< No register requirement. */
+ arch_register_req_type_normal = 1U << 0, /**< All registers in the class are allowed. */
+ arch_register_req_type_limited = 1U << 1, /**< Only a real subset of the class is allowed. */
+ arch_register_req_type_should_be_same = 1U << 2, /**< The register should be equal to another one at the node. */
+ arch_register_req_type_must_be_different = 1U << 3, /**< The register must be unequal from some other at the node. */
+ arch_register_req_type_ignore = 1U << 4, /**< ignore while allocating registers */
+ arch_register_req_type_produces_sp = 1U << 5, /**< the output produces a new value for the stack pointer */