e the bits corresponding to the type
   of dependency weakness.  */

/* Dependence can be overcome with generation of new data speculative
   instruction.  */
#define BEGIN_DATA (((ds_t) DEP_WEAK_MASK) << BEGIN_DATA_BITS_OFFSET)

/* This dependence is to the instruction in the recovery block, that was
   formed to recover after data-speculation failure.
   Thus, this dependence can overcome with generating of the copy of
   this instruction in the recovery block.  */
#define BE_IN_DATA (((ds_t) DEP_WEAK_MASK) << BE_IN_DATA_BITS_OFFSET)

/* Dependence can be overcome with generation of new control speculative
   instruction.  */
#define BEGIN_CONTROL (((ds_t) DEP_WEAK_MASK) << BEGIN_CONTROL_BITS_OFFSET)

/* This dependence is to the instruction in the recovery block, that was
   formed to recover after control-speculation failure.
   Thus, this dependence can be overcome with generating of the copy of
   this instruction in the recovery block.  */
#define BE_IN_CONTROL (((ds_t) DEP_WEAK_MASK) << BE_IN_CONTROL_BITS_OFFSET)

/* A few convenient combinations.  */
#define BEGIN_SPEC (BEGIN_DATA | BEGIN_CONTROL)
#define DATA_SPEC (BEGIN_DATA | BE_IN_DATA)
#define CONTROL_SPEC (BEGIN_CONTROL | BE_IN_CONTROL)
#define SPECULATIVE (DATA_SPEC | CONTROL_SPEC)
#define BE_IN_SPEC (BE_IN_DATA | BE_IN_CONTROL)

/* Constants, that are helpful in iterating through dep_status.  */
#define FIRST_SPEC_TYPE BEGIN_DATA
#define LAST_SPEC_TYPE BE_IN_CONTROL
#define SPEC_TYPE_SHIFT BITS_PER_DEP_WEAK

/* Dependence on instruction can be of multiple types
   (e.g. true and output). This fields enhance REG_NOTE_KIND information
   of the dependence.  */
#define DEP_TRUE (((ds_t) 1) << (BE_IN_CONTROL_BITS_OFFSET + BITS_PER_DEP_WEAK))
#define DEP_OUTPUT (DEP_TRUE << 1)
#define DEP_ANTI (DEP_OUTPUT << 1)
#define DEP_CONTROL (DEP_ANTI << 1)

#define DEP_TYPES (DEP_TRUE | DEP_OUTPUT | DEP_ANTI | DEP_CONTROL)

/* Instruction has non-speculative dependence.  This bit represents the
   property of an instruction - not the one of a dependence.
   Therefore, it can appear only in the TODO_SPEC field of an instruction.  */
#define HARD_DEP (DEP_CONTROL << 1)

/* Like HARD_DEP, but dependencies can perhaps be broken by modifying
   the instructions.  This is used for example to change:

   rn++		=>	rm=[rn + 4]
   rm=[rn]		rn++

   For instructions that have this bit set, one of the dependencies of
   the instructions will have a non-NULL REPLACE field in its DEP_T.
   Just like HARD_DEP, this bit is only ever set in TODO_SPEC.  */
#define DEP_POSTPONED (HARD_DEP << 1)

/* Set if a dependency is cancelled via speculation.  */
#define DEP_CANCELLED (DEP_POSTPONED << 1)

