sltiu

Set on less than immediate unsigned

Places the value 1 in register xd if register xs1 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 xd.

sltiu xd, xs1, 1 sets xd to 1 if xs1 equals zero, otherwise sets xd to 0 (assembler pseudoinstruction SEQZ xd, rs).
This instruction must have data-independent timing when extension Zkt is enabled.

Assembly format

sltiu xd, xs1, imm

Decode Variables

signed Bits<12> imm = sext($encoding[31:20], 12);
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

Execution

Bits<MXLEN> sign_extend_imm = $signed(imm);
X[xd] = (X[xs1] < sign_extend_imm) ? 1 : 0;

Encoding

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Defining extension

I

Access

M

Always

Containing profiles

  • Mandatory: RVA20S64, RVA20U64, RVA22S64, RVA22U64, RVA23S64, RVA23U64, RVB23S64, RVB23U64, RVI20U32, RVI20U64

  • Optional: None