29 
  30 /*
  31  * functions to map backwards and forwards between logical or floating
  32  * point immediates and their corresponding encodings. the mapping
  33  * from encoding to immediate is required by the simulator. the reverse
  34  * mapping is required by the OpenJDK assembler.
  35  *
  36  * a logical immediate value supplied to or returned from a map lookup
  37  * is always 64 bits. this is sufficient for looking up 32 bit
  38  * immediates or their encodings since a 32 bit immediate has the same
  39  * encoding as the 64 bit immediate produced by concatenating the
  40  * immediate with itself.
  41  *
  42  * a logical immediate encoding is 13 bits N:immr:imms (3 fields of
  43  * widths 1:6:6 -- see the arm spec). they appear as bits [22:10] of a
  44  * logical immediate instruction. encodings are supplied and returned
  45  * as 32 bit values. if a given 13 bit immediate has no corresponding
  46  * encoding then a map lookup will return 0xffffffff.
  47  */
  48 
  49 u_int64_t logical_immediate_for_encoding(u_int32_t encoding);
  50 u_int32_t encoding_for_logical_immediate(u_int64_t immediate);
  51 u_int64_t fp_immediate_for_encoding(u_int32_t imm8, int is_dp);
  52 u_int32_t encoding_for_fp_immediate(float immediate);
  53 
  54 #endif // _IMMEDIATE_H

  29 
  30 /*
  31  * functions to map backwards and forwards between logical or floating
  32  * point immediates and their corresponding encodings. the mapping
  33  * from encoding to immediate is required by the simulator. the reverse
  34  * mapping is required by the OpenJDK assembler.
  35  *
  36  * a logical immediate value supplied to or returned from a map lookup
  37  * is always 64 bits. this is sufficient for looking up 32 bit
  38  * immediates or their encodings since a 32 bit immediate has the same
  39  * encoding as the 64 bit immediate produced by concatenating the
  40  * immediate with itself.
  41  *
  42  * a logical immediate encoding is 13 bits N:immr:imms (3 fields of
  43  * widths 1:6:6 -- see the arm spec). they appear as bits [22:10] of a
  44  * logical immediate instruction. encodings are supplied and returned
  45  * as 32 bit values. if a given 13 bit immediate has no corresponding
  46  * encoding then a map lookup will return 0xffffffff.
  47  */
  48 
  49 uint64_t logical_immediate_for_encoding(uint32_t encoding);
  50 uint32_t encoding_for_logical_immediate(uint64_t immediate);
  51 uint64_t fp_immediate_for_encoding(uint32_t imm8, int is_dp);
  52 uint32_t encoding_for_fp_immediate(float immediate);
  53 
  54 #endif // _IMMEDIATE_H