vinshvlx

Vector Insert Halfword from VSR using GPR - specified Left-Index VX-form

vinshvlx VRT,RA,VRB

Inserts halfword from a vector register into another vector register at a position specified by a general-purpose register.

Encoding

Binary Layout

VRT

VRB

Format VX-form

Opcode 0x1000004F

Extension VMX (AltiVec)

Operands

VRT
Target Vector Register
RA
Source General Purpose Register
VRB
Source Vector Register
VSRT
Target Vector Register
VSRC1
Source Vector Register
VSRC2
Source Vector Register

Example

vinshvlx v1, r4, v3

Registers Altered

MSR

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

The instruction inserts the contents of bits 48:63 of VSR[VRB+32] into byte elements index:index+1 of VSR[VRT+32], where index is the contents of bits 60:63 of GPR[RA].

Operation

if MSR.VEC=0 then
    Vector_Unavailable()
index ← GPR[RA].bit[60:63]
src.byte[0:15] ← 0
VSR[VRT+32].byte[index:index+1] ← VSR[VRB+32].bit[48:63]

Programming Note

This instruction is used to insert the upper halfword of a vector register into specific byte elements of another vector register, based on an index derived from a general-purpose register. Ensure that the Vector Facility (MSR.VEC) is enabled; otherwise, a Vector_Unavailable exception will be raised. The index must be within the valid range for vector operations to avoid undefined behavior.