max_u: Wasm SIMD arithmetic instruction

The max_u instruction compares two v128 unsigned integer value interpretations and returns a new interpretation with each lane set to the greater of that lane index's value on the two inputs.

Try it

(module
  (import "console" "log" (func $log (param i32)))
  (func $main
    ;; load two v128 i16x8s onto the stack
    v128.const i16x8 10 400 0 86 87 9000 -5 19
    v128.const i16x8 200 20 0 -5 80 9 -6 283

    ;; return a i16x8 containing the greatest values from each input
    i16x8.max_u
    i16x8.extract_lane_s 5 ;; Extract a single lane
    call $log ;; log the result
  )
  (start $main)
)

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

Syntax

value_type.max_u

value_type

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

• i8x16
• i16x8
• i32x4

max_u

The max_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. A new v128 of the same type as the inputs, with each lane set to the greater of that lane index's value on the two inputs.

Binary encoding

Specifications

• WebAssembly Core Specification

See also

• max
• max_s