xxbrw

Pseudocode Operation

if MSR.VSX=0 then VSX_Unavailable()
do i = 0 to 3
    vsrc ←VSR[32×BX+B].word[i]
    do j = 0 to 3
        VSR[32×TX+T].word[i].byte[j] ←vsrc.byte[3-j]
    end
end

Programming Note

The xxbrw instruction is used to reverse the byte order of each word in a vector register. Ensure that VSX (Vector Scalar Extensions) is enabled by checking and setting the appropriate bit in the MSR register. This instruction operates on 128-bit vector registers, processing four 32-bit words per operation. Be cautious of alignment requirements; source and target vectors must be properly aligned to avoid exceptions.

Example