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default Order dec
$include <prelude.sail>
$include <string.sail>
$include <mapping.sail>
$include <hex_bits.sail>
type regbits = bits(5)
val reg_name : bits(5) <-> string
mapping reg_name = {
0b00000 <-> "zero",
0b00001 <-> "ra",
0b00010 <-> "sp",
0b00011 <-> "gp",
0b00100 <-> "tp",
0b00101 <-> "t0",
0b00110 <-> "t1",
0b00111 <-> "t2",
0b01000 <-> "fp",
0b01001 <-> "s1",
0b01010 <-> "a0",
0b01011 <-> "a1",
0b01100 <-> "a2",
0b01101 <-> "a3",
0b01110 <-> "a4",
0b01111 <-> "a5",
0b10000 <-> "a6",
0b10001 <-> "a7",
0b10010 <-> "s2",
0b10011 <-> "s3",
0b10100 <-> "s4",
0b10101 <-> "s5",
0b10110 <-> "s6",
0b10111 <-> "s7",
0b11000 <-> "s8",
0b11001 <-> "s9",
0b11010 <-> "s10",
0b11011 <-> "s11",
0b11100 <-> "t3",
0b11101 <-> "t4",
0b11110 <-> "t5",
0b11111 <-> "t6"
}
enum uop = RISCV_LUI | RISCV_AUIPC
mapping utype_mnemonic : uop <-> string = {
RISCV_LUI <-> "lui",
RISCV_AUIPC <-> "auipc"
}
scattered union ast
val assembly : ast <-> string
union clause ast = UTYPE : (bits(20), regbits, uop)
mapping clause assembly = UTYPE(imm, rd, op)
<-> utype_mnemonic(op) ^ spc() ^ reg_name(rd) ^ sep() ^ hex_bits_20(imm)
$counterexample
function prop(x: string) -> bool = {
not_bool(utype_mnemonic(RISCV_LUI) == x)
}
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