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.

Details

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.

Pseudocode 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.

Example

vinsblx v1, r4, r5

Encoding

Binary Layout
18
0
VRT
6
RA
11
RB
16
 
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)