vdot4a.vv

Vector 4-element signed-signed dot-product accumulate (vector-vector)

This instruction is defined by:

Encoding

Synopsis

Computes the dot product of four signed 8-bit elements from vs2 and four signed 8-bit elements from vs1 (both packed within the same 32-bit element group), sums the four products, and accumulates the signed 32-bit result into the corresponding 32-bit element of vd.

No saturation is performed; given the 8-bit source width and 32-bit accumulation width, overflow is presumed infrequent.

Access

M	HS	U	VS	VU
Always	Always	Always	Always	Always

Always

Decode Variables

Bits<1> vm = $encoding[25];
Bits<5> vs2 = $encoding[24:20];
Bits<5> vs1 = $encoding[19:15];
Bits<5> vd = $encoding[11:7];

Execution

Pruned, XLEN == 64
Original