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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)
"""
alias Orb.CustomType
# 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: Orb.Instruction.wrap_constant!(type, 0)
def optimized(type, 0, _), do: Orb.Instruction.wrap_constant!(type, 0)
# Multiply one by anything is that same thing.
def optimized(_type, a, 1), do: a
def optimized(_type, 1, b), do: b
# Finally, spit out the runtime instruction.
def optimized(type, a, b), do: Orb.Instruction.new(CustomType.resolve!(type), :mul, [a, b])
end