sh1add.uw

Shift unsigned word left by 1 and add

This instruction is defined by:

Encoding

Synopsis

Performs an XLEN-wide addition of two addends. The first addend is xs2. The second addend is the unsigned value formed by extracting the least-significant word of xs1 and shifting it left by 1 place.

Access

M	HS	U	VS	VU
Always	Always	Always	Always	Always

Always

Decode Variables

Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

Execution

Pruned, XLEN == 64
Original

X[xd] = X[xs2] + (X[xs1][31:0] << 1);

if (implemented?(ExtensionName::B) && (CSR[misa].B == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
X[xd] = X[xs2] + (X[xs1][31:0] << 1);