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.

(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

InstructionBinary formatExample text => binaryi8x16.avgr_u0xfd 123:u32i8x16.avgr_u => 0xfd 0x7bi16x8.avgr_u0xfd 155:u32i16x8.avgr_u => 0xfd 0x9b 0x01

Specifications

Browser compatibility