zext.h

Zero-extend halfword

This instruction is defined by:

Encoding

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Synopsis

Zero-extends the least-significant halfword of the source to XLEN by inserting 0’s into all of the bits more significant than 15.

The zext.h instruction is a pseudo-op for pack when Zbkb is implemented and XLEN == 32.
The zext.h instruction is a pseudo-op for packw when Zbkb is implemented and XLEN == 64.

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

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

Execution

  • Pruned, XLEN == 64

  • Original

X[xd] = X[xs1][15:0];
X[xd] = X[xs1][15:0];