xscmpopoqp

VSX Scalar Compare Ordered Quad-Precision

xscmpopoqp BF, vA, vB

Compares Quad floats (Signaling on NaN).

Encoding

Binary Layout

63

0:5

BF

6:8

/

9:10

vA

11:15

vB

16:20

132

21:30

/

31

 

Format X-form

Opcode 0xFC000108

Extension VSX

Operands

• BF
  CR Field
• vA
  Src A
• vB
  Src B

Example

xscmpopoqp cr0, va, vb

Related

More in VSX

Reference

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

Description

Compares two quad-precision floating-point values in VSRs vA and vB, signaling (raising exception) if either operand is a quiet NaN, and stores the comparison result (Less Than, Greater Than, Equal, or Unordered) in condition register field BF. The FPSCR VE flag may be set on NaN detection.

Operation

if (vA is NaN) or (vB is NaN) then FPSCR[VXSNAN] ← 1
if vA < vB then CR[BF] ← 0b100
else if vA > vB then CR[BF] ← 0b010
else if vA = vB then CR[BF] ← 0b001
else CR[BF] ← 0b011 (unordered)