xssqrtqpo

VSX Scalar Square Root Quad-Precision Odd

xssqrtqpo vD, vB

Used for Quad-Precision arithmetic on hardware that splits quads.

Encoding

Binary Layout

63

0:5

vD

6:10

0

11:15

vB

16:20

676

21:30

/

31

 

Format X-form

Opcode 0xFC1B0648

Extension VSX

Operands

• vD
  Target
• vB
  Source

Example

xssqrtqpo vd, vb

Registers Altered

FPSCR

Related

More in VSX

Reference

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

Description

Computes the square root of the odd (high-order) portion of a 128-bit quad-precision floating-point value in VSR vB, placing the result in VSR vD. This instruction is used on systems that split quad-precision operands into even/odd register pairs. FPSCR exception flags are updated based on the operation result. Requires VSX support.

Operation

vD ← sqrt(vB) as quad-precision (odd portion operation)
FPSCR[XX,ZX,OX,UX,VXSQRT] ← updated based on operation result

Programming Note

The xssqrtqpo instruction is used to compute the square root of a quad-precision floating-point value using the Round to Odd rounding mode. It handles signaling NaNs by raising an Invalid Operation exception and setting VXSNAN in the FPSCR. Ensure that the input is properly aligned and check the FPSCR for exceptions after execution.