srai

Shift right arithmetic immediate

This instruction is defined by:

Encoding

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Synopsis

Arithmetic shift (the original sign bit is copied into the vacated upper bits) the value in rs1 right by shamt, and store the result in rd.

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<6> shamt = $encoding[25:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

X[rd] = X[rs1] >>> shamt;
X[rd] = X[rs1] >>> shamt;