vstril

Vector String Isolate Left

vstril vD, vB

Isolates the leftmost element that matches the condition.

Encoding

Binary Layout

4

0:5

vD

6:10

0

11:15

vB

16:20

1607

21:31

 

Format VX-form

Opcode 0x10000647

Extension VMX (AltiVec)

Operands

• vD
  Target
• vB
  Source

Example

vstril vd, vb

Related

More in VMX (AltiVec)

Reference

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

Description

Searches the source vector vB from left to right for the first null byte (0x00) and isolates it, placing the result in vD with all bytes after the found null set to zero. Updates CR6 to indicate whether a null byte was found. This VMX instruction operates on byte elements.

Operation

vD ← isolate_left_null_byte(vB); CR6 ← null_byte_found_flag