# hv_vcpu_get_sme_p_reg(_:_:_:_:) Returns the value of a vCPU P predicate register in streaming Scalable Vector Extension (SVE) mode. ``` func hv_vcpu_get_sme_p_reg(_ vcpu: hv_vcpu_t, _ reg: hv_sme_p_reg_t, _ value: UnsafeMutablePointer, _ length: Int) -> hv_return_t ``` ## Parameters `vcpu` The vCPU ID of the vCPU instance `reg` ID of the P predicate register. `value` The pointer to the retrieved register value. `length` The length of the provided value storage, in bytes. ## Return Value `HV_SUCCESS` on success; otherwise an error code. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)