Start, offset - 2023.1 English

In all the subsequent intrinsics, the input vector(s) go through a data shuffling function that is controlled by two parameters:

• Start

• Offset

Let us take the fpmul function:

vector<float,8> fpmul(vector<float,32> xbuf, int xstart, unsigned int xoffs, vector<float,8> zbuf, int zstart, unsigned int zoffs)

• xbuf, xstart, xoffs: first buffer and shuffling parameters

• zbuf, zstart, zoffs: second buffer and shuffling parameters

• Start: starting offset for all lanes of the buffer

• Offset: additional, lane-dependent offset for the buffer. Definition takes 4 bits per lane.

For example:

vector<float,8> ret = fpmul(xbuf,2,0x210FEDCB,zbuf,7,0x76543210)

for (i = 0 ; i < 8 ; i++)
  ret[i] =  xbuf[xstart + xoffs[i]] * zbuf[zstart + zoffs[i]]

All values in hexadecimal: