xsrqpix

VSX Scalar Round Quad-Precision to Integer Extended

xsrqpix vD, vB, R

Rounds a Quad float to a Quad integer (Exact).

Encoding

Binary Layout

63

0:5

VRT

6:10

///

11:14

R

15

VRB

16:20

RMC

21:22

5

23:30

EX

31

 

Format Z23-form

Opcode 0xFC00000B

Extension VSX

Operands

• vD
  Target
• vB
  Source
• R
  Mode

Example

xsrqpix vd, vb, 0

Registers Altered

FPSCR, MSR

Related

More in VSX

Reference

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

Description

Rounds a quad-precision floating-point value in FRB to a quad-precision integer, placing the result in FRT. The rounding mode is specified by the R operand. FPSCR is updated with exceptions; this is a VSX instruction requiring VSX support.

Operation

let temp ← RoundToQuadInt(FRB, R)
FRT ← temp
FPSCR[FPRF, XX, ZX, UX, OX] ← updated based on operation

Programming Note

The xsrqpix instruction is used to round a quad-precision floating-point number to an integer. Ensure that the VSX (Vector Scalar Extensions) are enabled in the MSR register, as attempting to use this instruction when VSX is unavailable will result in an exception. The rounding mode is determined by the FPSCR register, and the instruction handles special cases like NaNs by setting appropriate flags in the FPSCR.