xvcvspdp

VSX Vector Convert Single to Double

xvcvspdp XT, XB

Converts two floats to two doubles.

Encoding

Binary Layout

60

0:5

XT

6:10

0

11:15

XB

16:20

457

21:31

 

Format XX2-form

Opcode 0xF0000724

Extension VSX

Operands

• XT
  Target
• XB
  Source

Example

xvcvspdp vs1, vs3

Registers Altered

FPSCR, MSR

Related

More in VSX

Reference

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

Description

Converts two single-precision floating-point values in VSR[XB] to double-precision format and places the results in VSR[XT]. The single-precision elements (0 and 1) are expanded to double-precision elements (0 and 1). No rounding is required for this widening conversion.

Operation

VSR[XT].element[0] ← ConvertSP_to_DP(VSR[XB].element[0])
VSR[XT].element[1] ← ConvertSP_to_DP(VSR[XB].element[1])

Programming Note

The xvcvspdp instruction is used to convert a vector of single-precision floating-point values to double-precision. Ensure that the VSX (Vector Scalar Extensions) are enabled in the MSR register, otherwise, an exception will be raised. Handle special cases like signaling NaNs by checking and setting the appropriate flags in FPSCR.