vbrh

Vector Byte-Reverse Halfword

vbrh vD, vB

Reverses bytes within each halfword (Endian Swap).

Encoding

Binary Layout

4

0:5

vD

6:10

0

11:15

vB

16:20

1606

21:31

 

Format VX-form

Opcode 0x10000646

Extension VMX (AltiVec)

Operands

• vD
  Target
• vB
  Source

Example

vbrh vd, vb

Related

More in VMX (AltiVec)

Reference

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

Description

Reverses the order of bytes within each halfword (16-bit element) of the source vector, effectively performing a 16-bit endianness swap. The operation processes all 8 halfwords in the 128-bit vector independently. This instruction requires VMX/AltiVec support and does not affect any status registers.

Operation

for i = 0 to 7 do
  VR[vD][i*16:i*16+15] ← reverse_bytes(VR[vB][i*16:i*16+15])
end for