addiw

Add immediate word

This instruction is defined by:

Encoding

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Synopsis

Add an immediate to the 32-bit value in rs1, and store the sign extended result in rd

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<12> imm = $encoding[31:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

XReg operand = sext(X[rs1], 31);
X[rd] = sext(operand + imm, 31);
XReg operand = sext(X[rs1], 31);
X[rd] = sext(operand + imm, 31);