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

(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

InstructionBinary formatExample text => binaryi8x16.all_true0xfd 99:u32i8x16.all_true => 0xfd 0x63i16x8.all_true0xfd 131:u32i16x8.all_true => 0xfd 0x83 0x01i32x4.all_true0xfd 163:u32i32x4.all_true => 0xfd 0xa3 0x01i64x2.all_true0xfd 195:u32i64x2.all_true => 0xfd 0xc3 0x01

Specifications

Browser compatibility