WebAssembly SIMD-specific bitwise instructions

Bitwise logic

all_true

Tests whether all lanes of a v128 input value are non-zero.

andnot

Takes two v128 input values. It performs a bitwise AND on the first value and a second value equal to the result of performing a bitwise NOT on each byte of the second original value. It returns a new v128 value containing the result.

any_true

Tests whether a v128 input value contains any non-zero bits.

bitmask

Inspects the most significant bit (MSB) — bit 7 — of each byte of a v128 value interpretation. This is the sign bit if the value is treated as signed. The instruction's output value is equal to all of those bits collected into a single i32.

bitselect

Takes three v128 values as inputs — two inputs and a mask value — and returns a new v128 value with each byte calculated using the formula output = (input1 AND mask) OR (input2 AND NOT mask).

not

Performs a bitwise NOT on each byte of a v128 value and returns a new v128 value containing the result.

See also

• WebAssembly numeric instructions