dctfix

Decimal Convert To Fixed

dctfix FRT,FRB

Converts a decimal floating-point number to a fixed-point integer.

Encoding

Binary Layout

59

0:5

FRT

6:10

/

11:15

FRB

16:20

290

21:30

Rc

31

 

Format X-form

Opcode 0xEC000244

Extension Decimal Floating-Point

Operands

• FRT
  Target
• FRB
  Source

Example

dctfix f1, f3

Registers Altered

FPSCR (FPRF, FR, FI, FX, VXSNAN, VXCVI, XX), CR1 (if Rc=1)

Related

More in Decimal Floating-Point

Reference

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

Description

The DFP operand in FRB is rounded to an integer value and placed into FRT in the 64-bit signed binary integer format. The sign of the result is the same as the sign of the source operand, except when the source operand is a NaN or a zero.

Operation

if 'dctfix' then
    FRT <- round(FRB)
else if 'dctfix.' then
    FRT <- round(FRB)
    CR1 <- result of comparison

Programming Note

It is recommended that software pre-round the operand to a floating-point integral using drintx[q] or drintn[q] if a rounding mode other than the current rounding mode specified by DRN is needed.