xvcvuxwsp

VSX Vector Convert Unsigned Word to Single

xvcvuxwsp XT, XB

Converts four 32-bit unsigned integers to four floats.

Details

The xvcvuxwsp instruction converts each unsigned integer word from the source vector register to a single-precision floating-point value, rounds it according to the rounding mode specified by FPSCR.RN, and stores the result in the target vector register. If any trap-enabled exception occurs during the conversion of any element, no results are written to the target register.

Pseudocode Operation

if MSR.VSX=0 then VSX_Unavailable()
ex_flag ←0b0
do i = 0 to 3
   reset_xflags()
   src ←bfp_CONVERT_FROM_UI32(VSR[32×BX+B].word[i])
   rnd ←bfp_ROUND_TO_BFP32(FPSCR.RN,src)
   vresult.word[i] ←bfp32_CONVERT_FROM_BFP(rnd)
   if xx_flag=1 then SetFX(FPSCR.XX)
   ex_flag ←ex_flag | (FPSCR.XE & xx_flag)
end
if ex_flag=0 then VSR[32×TX+T] ←vresult

Programming Note

This instruction is commonly used for converting unsigned integer data to floating-point format in vector operations. Ensure that the VSX (Vector Scalar Extensions) are enabled by checking and setting MSR.VSX before using this instruction. Be aware of potential exceptions during conversion, as no results will be written to the target register if any trap-enabled exception occurs. The rounding mode is determined by FPSCR.RN, so ensure it's set appropriately for your application.

Example

xvcvuxwsp vs1, vs3

Encoding

Binary Layout

136

Format XX2-form

Opcode 0xF0000088

Extension VSX

Registers Altered FPSCR, MSR

Operands

XT
Target
XB
Source