// OPCODE, MNEMONIC, TYPE, DOC;
 
 0, UN,     N,    "Cause an unreachable code trap"        ;
 1, TX,     N,    "Termiante execution"                   ;
 2, NOP,    N,    "Do nothing"                            ;

 3, ADD,    RRR,  "Addition"                              ;
 4, SUB,    RRR,  "Subtraction"                           ;
 5, MUL,    RRR,  "Multiplication"                        ;
 6, AND,    RRR,  "Bitand"                                ;
 7, OR,     RRR,  "Bitor"                                 ;
 8, XOR,    RRR,  "Bitxor"                                ;
 9, SL,     RRR,  "Unsigned left bitshift"                ;
10, SR,     RRR,  "Unsigned right bitshift"               ;
11, SRS,    RRR,  "Signed right bitshift"                 ;
12, CMP,    RRR,  "Signed comparsion"                     ;
13, CMPU,   RRR,  "Unsigned comparsion"                   ;
14, DIR,    RRRR, "Merged divide-remainder"               ;
15, NOT,    RR,   "Logical negation"                      ;
16, ADDI,   RRD,  "Addition with immediate"               ;
17, MULI,   RRD,  "Multiplication with immediate"         ;
18, ANDI,   RRD,  "Bitand with immediate"                 ;
19, ORI,    RRD,  "Bitor with immediate"                  ;
20, XORI,   RRD,  "Bitxor with immediate"                 ;
21, SLI,    RRW,  "Unsigned left bitshift with immedidate";
22, SRI,    RRW,  "Unsigned right bitshift with immediate";
23, SRSI,   RRW,  "Signed right bitshift with immediate"  ;
24, CMPI,   RRD,  "Signed compare with immediate"         ;
25, CMPUI,  RRD,  "Unsigned compare with immediate"       ;

26, CP,     RR,   "Copy register"                         ;
27, SWA,    RR,   "Swap registers"                        ;
28, LI,     RD,   "Load immediate"                        ;
29, LRA,    RRO,  "Load relative address"                 ;
30, LD,     RRAH, "Load from absolute address"            ;
31, ST,     RRAH, "Store to absolute address"             ;
32, LDR,    RROH, "Load from relative address"            ;
33, STR,    RROH, "Store to relative address"             ;
34, BMC,    RRH,  "Copy block of memory"                  ;
35, BRC,    RRB,  "Copy register block"                   ;

36, JMP,    A,    "Absolute jump"                         ;
37, JMPR,   O,    "Relative jump"                         ;
38, JAL,    RRA,  "Linking absolute jump"                 ;
39, JALR,   RRO,  "Linking relative jump"                 ;
40, JEQ,    RRP,  "Branch on equal"                       ;
41, JNE,    RRP,  "Branch on nonequal"                    ;
42, JLT,    RRP,  "Branch on lesser-than (signed)"        ;
43, JGT,    RRP,  "Branch on greater-than (signed)"       ;
44, JLTU,   RRP,  "Branch on lesser-than (unsigned)"      ;
45, JGTU,   RRP,  "Branch on greater-than (unsigned)"     ;
46, ECALL,  N,    "Issue ecall trap"                      ;

47, ADDF,   RRR,  "Floating addition"                     ;
48, SUBF,   RRR,  "Floating subtraction"                  ;
49, MULF,   RRR,  "Floating multiply"                     ;
50, DIRF,   RRRR, "Merged floating divide-remainder"      ;
51, FMAF,   RRRR, "Fused floating multiply-add"           ;
52, NEGF,   RR,   "Floating sign negation"                ;
53, ITF,    RR,   "Int to float"                          ;
54, FTI,    RR,   "Float to int"                          ;

55, ADDFI,  RRD,  "Floating addition with immediate"      ;
56, MULFI,  RRD,  "Floating multiplication with immediate";

57, LRA16 , RRP,  "Load relative immediate (16 bit)"      ;
58, LDR16 , RRPH, "Load from relative address (16 bit)"   ;
59, STR16 , RRPH, "Store to relative address (16 bit)"    ;
60, JMPR16, P,    "Relative jump (16 bit)"                ;