avgr_u: Wasm SIMD arithmetic instruction

The avgr_u SIMD arithmetic instruction performs a rounding average of two unsigned v128 value interpretations. Each lane of the output value is (a + b + 1) / 2, i.e., the mean average of the corresponding lanes of the input values, rounded up to the nearest integer.

Try it

(module
  (import "console" "log" (func $log (param i32)))
  (func $main
    v128.const i16x8 4 6 16 8 23 65 82 9
    v128.const i16x8 0 25 2 30 2 34 45 80

    i16x8.avgr_u
    i16x8.extract_lane_s 7
    call $log ;; log the result
  )
  (start $main)
)

WebAssembly.instantiateStreaming(fetch("{%wasm-url%}"), { console });

Syntax

value_type.avgr_u

value_type

The type of value the instruction is being run on. The following types support avgr_u:

• i8x16
• i16x8

avgr_u

The avgr_u instruction. Must always be included after the value_type and a period (.).

Type

[input1, input2] -> [output]

input1

The first input value.

input2

The second input value.

output

The output value.

Binary encoding

Specifications

• WebAssembly Core Specification