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DSL for WebAssembly
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lib/orb/numeric/multiply.ex
defmodule Orb.Numeric.Multiply do
@moduledoc """
WebAssembly numeric `mul` instruction:
- `i32.mul`
- `i64.mul`
- `f32.mul`
- `f64.mul`
[MDN reference](https://developer.mozilla.org/en-US/docs/WebAssembly/Reference/Numeric/Multiplication)
"""
# Perform at comptime.
def optimized(_type, a, b) when is_integer(a) and is_integer(b), do: a * b
# Multiply anything by zero equals zero.
def optimized(_type, _, 0), do: 0
def optimized(_type, 0, _), do: 0
# Multiply anything by one is that same thing.
def optimized(_type, a, 1), do: a
def optimized(_type, 1, b), do: b
# Finally, spit out the instruction.
def optimized(type, a, b), do: {type.wasm_type(), :mul, {a, b}}
end