all_true: Wasm SIMD bitwise instruction

The all_true SIMD bitwise instruction tests whether all lanes of a v128 input value are non-zero.

Try it

(module
  (import "console" "log" (func $log (param i32)))
  (func $main
    v128.const i8x16 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
    i8x16.all_true

    call $log ;; log the result
  )
  (start $main)
)

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

Syntax

value_type.all_true

value_type

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

• i8x16
• i16x8
• i32x4
• i64x2

all_true

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

Type

[input] -> [output]

input

The input v128 value interpretation.

output

The output value. This is an i32 type equal to 1 if the v128 input contains all non-zero bits, or 0 if any of the bits are 0.

Binary encoding

Specifications

• WebAssembly Core Specification