sltiu

Set on less than immediate unsigned

This instruction is defined by:

Encoding

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Synopsis

Places the value 1 in register rd if register rs1 is less than the sign-extended immediate when both are treated as unsigned numbers (i.e., the immediate is first sign-extended to XLEN bits then treated as an unsigned number), else 0 is written to rd.

sltiu rd, rs1, 1 sets rd to 1 if rs1 equals zero, otherwise sets rd to 0 (assembler pseudoinstruction SEQZ rd, rs).

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

X[rd] = (X[rs1] < imm) ? 1 : 0;
X[rd] = (X[rs1] < imm) ? 1 : 0;