remuw

Unsigned 32-bit remainder

This instruction is defined by:

Encoding

Synopsis

Calculate the remainder of unsigned division of the 32-bit values in rs1 by rs2, and store the sign-extended result in rd.

If the value in rs2 is zero, rd gets the sign-extended value in rs1.

Access

Always

Decode Variables

Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];

Execution

Pruned, XLEN == 64
Original

Bits<32> src1 = X[rs1][31:0];
Bits<32> src2 = X[rs2][31:0];
if (src2 == 0) {
  Bits<1> sign_bit = src1[31];
  X[rd] = {{32{sign_bit}}, src1};
} else {
  Bits<32> result = src1 % src2;
  Bits<1> sign_bit = result[31];
  X[rd] = {{32{sign_bit}}, result};
}

if (implemented?(ExtensionName::M) && (CSR[misa].M == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
Bits<32> src1 = X[rs1][31:0];
Bits<32> src2 = X[rs2][31:0];
if (src2 == 0) {
  Bits<1> sign_bit = src1[31];
  X[rd] = {{32{sign_bit}}, src1};
} else {
  Bits<32> result = src1 % src2;
  Bits<1> sign_bit = result[31];
  X[rd] = {{32{sign_bit}}, result};
}