pto.vintlv

pto.vintlv is part of the Data Rearrangement instruction set.

Summary

Interleave two source vectors into an ordered low/high result pair.

Mechanism

pto.vintlv merges the two source vectors lane-by-lane. The low result receives the first half of the interleaved stream and the high result receives the second half. Conceptually: low = {lhs[0], rhs[0], lhs[1], rhs[1], ...} and high = {lhs[N/2], rhs[N/2], lhs[N/2+1], rhs[N/2+1], ...}.

Syntax

PTO Assembly Form

vintlv %low, %high, %lhs, %rhs

AS Level 1 (SSA)

%low, %high = pto.vintlv %lhs, %rhs : !pto.vreg<NxT>, !pto.vreg<NxT> -> !pto.vreg<NxT>, !pto.vreg<NxT>

Inputs

Operand Type Description
%lhs !pto.vreg<NxT> First source vector
%rhs !pto.vreg<NxT> Second source vector

Expected Outputs

Result Type Description
%low !pto.vreg<NxT> First half of the interleaved stream
%high !pto.vreg<NxT> Second half of the interleaved stream

Side Effects

This operation has no architectural side effect beyond producing its destination values. It does not implicitly reserve buffers, signal events, or establish memory fences.

Constraints

Constraints

  • %lhs, %rhs, %low, and %high MUST have the same element type and vector width.
  • The result pair ordering is architectural and MUST be preserved by lowering.

Exceptions

Exceptions

  • The verifier rejects illegal operand shapes, unsupported element types, and attribute combinations that are not valid for the selected instruction set or target profile.
  • Any additional illegality stated in the constraints section is also part of the contract.

Target-Profile Restrictions

Target-Profile Restrictions
  • A5 is the most detailed concrete profile in the current manual; CPU simulation and A2/A3-class targets may support narrower subsets or emulate the behavior while preserving the visible PTO contract.
  • Code that depends on an instruction-set-specific packing, selector, or permutation mode should treat that dependency as target-profile-specific unless the manual states cross-target portability explicitly.

Examples

// low  = {lhs[0], rhs[0], lhs[1], rhs[1], ...}
// high = {lhs[N/2], rhs[N/2], lhs[N/2+1], rhs[N/2+1], ...}