vinsblx

Vector Insert Byte from GPR using GPR-specified Left-Index VX-form

vinsblx VRT,RA,RB

Inserts a byte from a general-purpose register into a vector register at an index specified by another general-purpose register.

Encoding

Binary Layout

0:5

VRT

6:10

11:15

16:31

Format VX-form

Opcode 0x1000020F

Extension VMX (AltiVec)

Operands

VRT
Target Vector Register
RA
Source General Purpose Register (index)
RB
Source General Purpose Register (data)

Example

vinsblx v1, r4, r5

Reference

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

Description

The contents of bits 56:63 of GPR[RB] are placed into byte element index of VSR[VRT+32], where index is the contents of bits 60:63 of GPR[RA]. All other byte elements of VSR[VRT+32] remain unchanged.

Operation

if MSR.VEC=0 then
    Vector_Unavailable()
index ← GPR[RA].bit[60:63]
src.byte[0:15] ← 0
VSR[VRT+32].byte[index] ← GPR[RB].bit[56:63]

Programming Note

The vinsblx instruction is used to insert a byte from a general-purpose register (GPR) into a vector register, using another GPR to specify the index. Ensure that the MSR.VEC bit is set to 1; otherwise, a Vector_Unavailable exception will be raised. The index must be within the range of 0-15, as it specifies which byte element in the vector register to update. This instruction does not require any special alignment and operates at privilege level 0.