-typedef enum {
- ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER = 0x0001,
- ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP = 0x0002,
- ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE = 0x0004,
- ASM_CONSTRAINT_FLAG_NO_SUPPORT = 0x0008,
- ASM_CONSTRAINT_FLAG_MODIFIER_WRITE = 0x0010,
- ASM_CONSTRAINT_FLAG_MODIFIER_NO_WRITE = 0x0020,
- ASM_CONSTRAINT_FLAG_MODIFIER_READ = 0x0040,
- ASM_CONSTRAINT_FLAG_MODIFIER_NO_READ = 0x0080,
- ASM_CONSTRAINT_FLAG_MODIFIER_EARLYCLOBBER = 0x0100,
- ASM_CONSTRAINT_FLAG_MODIFIER_COMMUTATIVE = 0x0200,
- ASM_CONSTRAINT_FLAG_INVALID = 0x8000
+/**
+ * @defgroup be Code Generation
+ *
+ * Code Generation (backend) produces machine-code.
+ * @{
+ */
+
+/**
+ * flags categorizing assembler constraint specifications
+ */
+typedef enum asm_constraint_flags_t {
+ ASM_CONSTRAINT_FLAG_NONE = 0, /**< no constraints */
+ /** input/output can be in a register */
+ ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER = 1u << 0,
+ /** input/output can be read/written to/from a memory address */
+ ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP = 1u << 1,
+ /** input can be encoded as an immediate number */
+ ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE = 1u << 2,
+ /** the constraint is not supported yet by libFirm */
+ ASM_CONSTRAINT_FLAG_NO_SUPPORT = 1u << 3,
+ /** The input is also written to */
+ ASM_CONSTRAINT_FLAG_MODIFIER_WRITE = 1u << 4,
+ /** the input is not written to */
+ ASM_CONSTRAINT_FLAG_MODIFIER_NO_WRITE = 1u << 5,
+ /** the input is read */
+ ASM_CONSTRAINT_FLAG_MODIFIER_READ = 1u << 6,
+ /** the input is not read */
+ ASM_CONSTRAINT_FLAG_MODIFIER_NO_READ = 1u << 7,
+ /** the value is modified before all inputs to the asm block
+ * are handled. */
+ ASM_CONSTRAINT_FLAG_MODIFIER_EARLYCLOBBER = 1u << 8,
+ /** This operand and the following operand are commutative */
+ ASM_CONSTRAINT_FLAG_MODIFIER_COMMUTATIVE = 1u << 9,
+ /** invalid constraint (due to parse error) */
+ ASM_CONSTRAINT_FLAG_INVALID = 1u << 10