remu
Unsigned remainder
This instruction is defined by:
-
M, version >= 0
This instruction is included in the following profiles:
-
RVA20U64 (Mandatory)
-
RVA22U64 (Mandatory)
-
RVI20U32 (Optional)
-
RVI20U64 (Optional)
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
-
IDL
-
Sail
if (implemented?(ExtensionName::M) && (CSR[misa].M == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg src1 = X[rs1];
XReg src2 = X[rs2];
if (src2 == 0) {
X[rd] = src1;
} else {
X[rd] = src1 % src2;
}{
if extension("M") then {
let rs1_val = X(rs1);
let rs2_val = X(rs2);
let rs1_int : int = if s then signed(rs1_val) else unsigned(rs1_val);
let rs2_int : int = if s then signed(rs2_val) else unsigned(rs2_val);
let r : int = if rs2_int == 0 then rs1_int else rem_round_zero(rs1_int, rs2_int);
/* signed overflow case returns zero naturally as required due to -1 divisor */
X(rd) = to_bits(sizeof(xlen), r);
RETIRE_SUCCESS
} else {
handle_illegal();
RETIRE_FAIL
}
}