xxspltib

VSX Vector Splat Immediate Byte

xxspltib XT, IMM

Copies an immediate byte value into each byte element of a vector register.

Encoding

Binary Layout

60

0:5

XT

6:10

0

11:15

IMM

16:20

360

21:31

 

Format X-form

Opcode 0xF00002D0

Extension VSX

Operands

• XT
  Target
• IMM
  Value
• IMM8
  Immediate Byte Value

Example

xxspltib vs1, 1

Registers Altered

MSR

Related

More in VSX

Reference

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

Description

Splats an 8-bit immediate byte value across all 16 byte elements of VSR XT. Each byte of XT is set to the same immediate value, providing an efficient way to initialize a vector with a constant. This is a VSX instruction that does not update condition flags.

Operation

byte_val ← IMM[0:7]
for i ← 0 to 15
  XT[i * 8 : i * 8 + 7] ← byte_val

Programming Note

The xxspltib instruction is used to fill a VSX vector register with an immediate byte value. Ensure that the appropriate privilege level (VSX or Vector) is enabled in the MSR register, otherwise, it will raise an exception. This instruction is useful for initializing vectors with a constant value.