dquai.

DFP Quantize Immediate

dquai. TE,FRT,FRB,RMC

Quantizes a DFP value to an immediate number of decimal digits.

Encoding

Binary Layout

0

0:5

FRT

6:10

TE

11:15

FRB

16:20

RMC

21:30

Rc

31

 

Format Z23-form

Opcode 0xEC000086

Extension Decimal Floating-Point

Operands

• TE
  Target Exponent
• FRT
  Target Floating-Point Register
• FRB
  Source Floating-Point Register
• RMC
  Rounding Mode Control

Example

dquai. f1, f3, 4

Related

More in Decimal Floating-Point

Reference

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

Description

Quantizes a decimal floating-point (DFP) value in FRB to the number of decimal digits specified by immediate UI, storing the result in FRT. This instruction is part of the Decimal Floating-Point category and updates FPSCR and CR1 when Rc=1.

Operation

FRT ← Quantize(FRB, UI)
FPSCR ← updated with DFP status
CR1 ← (FRT is NaN, FRT is Infinity, FRT is Zero, FRT is Negative) if Rc=1

Programming Note

The dquai. instruction is used for quantizing DFP values with an immediate quantum, rounding as necessary. Ensure that the immediate field UI specifies a valid quantum and that the source operand FRB is correctly formatted. This instruction operates at the problem state privilege level.