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DSL for WebAssembly
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lib/orb/numeric/sub.ex
defmodule Orb.Numeric.Subtract do
@moduledoc """
WebAssembly numeric `sub` instruction:
- `i32.sub`
- `i64.sub`
- `f32.sub`
- `f64.sub`
[MDN reference](https://developer.mozilla.org/en-US/docs/WebAssembly/Reference/Numeric/Subtraction)
"""
alias Orb.CustomType
require alias Orb.Ops
# Perform at comptime.
def optimized(_type, a, b) when is_integer(a) and is_integer(b), do: a - b
# Minus zero from anything is that same thing.
def optimized(_type, a, 0), do: a
def optimized(type, a, b) when Ops.is_primitive_type(type),
do: Orb.Instruction.new(type, :sub, [a, b])
def optimized(type, a, b), do: Orb.Instruction.new(CustomType.resolve!(type), :sub, [a, b])
end