rem
Signed remainder
Calculate the remainder of signed division of xs1 by xs2, and store the result in xd.
If the value in register xs2 is zero, write the value in xs1 into xd;
If the result of the division overflows, write zero into xd;
Decode Variables
Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];Execution
if (implemented?(ExtensionName::M) && (CSR[misa].M == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg src1 = X[xs1];
XReg src2 = X[xs2];
if (src2 == 0) {
X[xd] = src1;
} else if ((src1 == {1'b1, {MXLEN - 1{1'b0}}}) && (src2 == {MXLEN{1'b1}})) {
X[xd] = 0;
} else {
X[xd] = $signed(src1) % $signed(src2);
}