xvcvuxdsp

VSX Vector Convert with round Unsigned Doubleword to Single-Precision format

xvcvuxdsp VS32,VS64

Converts an unsigned doubleword to a single-precision floating-point value with rounding.

Encoding

Binary Layout

111100

0:5

VS32

6:10

//

11:15

VS64

16:20

11010

21:30

1000

31

 

Format XX2-form

Opcode 0xF00006A0

Extension VSX

Operands

• VS32
  Target Vector Register
• VS64
  Source Vector Register

Example

xvcvuxdsp vs1, vs1

Related

More in VSX

Reference

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

Description

Converts a 64-bit unsigned doubleword integer (in the doubleword elements of VS64) to 32-bit single-precision floating-point format with rounding and stores the result in the corresponding word elements of VS32. This is a VSX instruction that performs IEEE-compliant rounding and may update FPSCR.

Operation

for i in 0 to 1:
  VS32[2*i:2*i+1] ← CONVERT_UNSIGNED_DWORD_TO_SINGLE_PRECISION_ROUNDED(VS64[i])

Programming Note

This instruction is useful for converting unsigned 64-bit integers to single-precision floating-point numbers. Ensure that the source vector elements are properly aligned and consider the current rounding mode's effect on conversion results. The target vector register will have its lower words zeroed out, so handle this if you need to preserve data in those positions.