vgo is a compiler for array arithmetic expressions.

It is meant for use by Go programs, and currently targets SSE2 on amd64. It compiles functions written in Go syntax: see samples/vector.vgo for examples.

Usage

vgo's language is Go-like (hence gofmt-friendly) and very limited and simple. Functions must take arguments of the same type, the first type being the output slice.

All arguments must have the same length and have size multiple of 128 bits, otherwise an index runtime-panic will be triggered.

func SomeFormula(out, x, y, z []float32) {
	out = (x*y + y*z + z*x) / (x*x + y*y + z*z)
}

Functions may only be made of a single assignment statement with an arithmetic expression. Not all operators are supported by all types.

A vgo source file may mix normal Go functions and vgo functions. It is named with the .vgo extension. The vgo invocation

$ vgo

will produce from a vgo source file source.vgo a Go source file source_amd64.go and a Plan 9-like assembly file source_amd64.s suitable for use by 6a.

TODOs

• support multiple statements.
• support integer quotients (via magic constants?).
• support scalar/vector operations and constants.