VREDSUM.VS

Vector Reduction Sum

VREDSUM.VS vd, vs2, vs1, vm

Reduces a vector to a scalar by summing all elements.

Details

Performs a vector reduction: applies the operation across all active elements of vs2, using vs1[0] as the initial accumulator, and writes the scalar result to vd[0]. Active elements are determined by vl.

Pseudocode Operation

vd[0] = vs1[0] + sum(vs2[*]);

Example

VREDSUM.VS v1, v4, v2, v0.t

Encoding

Binary Layout
000000
31:26
vm
25
vs2
24:20
vs1
19:15
010
14:12
vd
11:7
1010111
6:0
 
Format OPMVV
Opcode 0x57
Extension V

Operands

  • vd
    Dest Scalar
  • vs2
    Source Vector
  • vs1
    Start Scalar