drsp.

Decimal Round To DFP Short (Record)

drsp. FRT,FRB

Rounds DFP Long (64-bit) to DFP Short (32-bit compressed).

Encoding

Binary Layout

59

0:5

FRT

6:10

0

11:15

FRB

16:20

770

21:30

/

31

 

Format X-form

Opcode 0xEC000604

Extension Decimal Floating-Point

Operands

• FRT
  Target
• FRB
  Source

Example

drsp f1, f3

Registers Altered

FPSCR, CR0, CR1

Related

More in Decimal Floating-Point

Reference

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

Description

The DFP long operand in FRB is converted and rounded to DFP short format. The DFP short value is extended on the left with zeros to form a 64-bit entity and placed into FRT. The sign of the result is the same as the sign of the source operand.

Operation

if 'drsp' then
    FRT <- (FRB) rounded to DFP short format
    if Rc=1 then
        CR0, CR1 <- updated based on result

Programming Note

Note that DFP short format is a storage-only format. Therefore, conversion of a long SNaN to short for mat will not cause an exception.