lxsbu

Load scaled indexed byte unsigned

This instruction is defined by:

Encoding

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Synopsis

Load 8 bits of data into register xd from the effective address X[xs2] + X[xs1], where xs2 is the base and xs1 is the index. Zero extend the result to XLEN.

The lxbu mnemonic is an assembler pseudoinstruction for lxsbu.

Access

M HS U VS VU

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

XReg virtual_address = X[xs2] + X[xs1];
X[xd] = read_memory(8, virtual_address, $encoding);
XReg virtual_address = X[xs2] + X[xs1];
X[xd] = read_memory(8, virtual_address, $encoding);

Exceptions

This instruction may result in the following synchronous exceptions:

  • LoadAccessFault

  • LoadPageFault