c.zext.b

Zero-extend byte, 16-bit encoding

This instruction is defined by:

Encoding

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Synopsis

Takes a single source/destination operand. This instruction zero-extends the least-significant byte of the source to XLEN by inserting 0’s into all of the bits more significant than 7.

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

Bits<3> xd = $encoding[9:7];

Execution

  • Pruned, XLEN == 64

  • Original

X[creg2reg(xd)] = X[creg2reg(xd)][7:0];
if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
X[creg2reg(xd)] = X[creg2reg(xd)][7:0];