I have run go get github.com/gonum/internal/asm then go get github.com/gonum/floats. The latter yields 7 errors that appear to be related to missing assembly functions, see below. Is this an issue or am I doing something wrong?

bash-4.1$ go get github.com/gonum/floats

github.com/gonum/floats

../../go_projects/src/github.com/gonum/floats/floats.go:27: undefined: asm.DaxpyUnitaryTo
../../go_projects/src/github.com/gonum/floats/floats.go:39: undefined: asm.DaxpyUnitaryTo
../../go_projects/src/github.com/gonum/floats/floats.go:56: undefined: asm.DaxpyUnitaryTo
../../go_projects/src/github.com/gonum/floats/floats.go:68: undefined: asm.DaxpyUnitaryTo
../../go_projects/src/github.com/gonum/floats/floats.go:702: undefined: asm.DscalUnitary
../../go_projects/src/github.com/gonum/floats/floats.go:732: undefined: asm.DaxpyUnitaryTo
../../go_projects/src/github.com/gonum/floats/floats.go:744: undefined: asm.DaxpyUnitaryTo

The rest of gonum has the property that if a destination slice is nil, a new slice is allocated. floats does not follow this property. Should it?

If so, these are the ones that need it:
AddScaledTo
AddTo
CumProd
CumSum
DivTo
MulTo
SubTo

In #27 @btracey mentioned that AddConst should be removed. It is just a wrapper around a simple loop but it is used at a couple of places in gonum (some of them added recently), so it looks like it is doing some service. What is the current opinion on this?

It seems that there is an assembly version of cumsum in https://github.com/gonum/internal/tree/master/asm/f64

Any reason for not using it here yet?

Compiling with go1.8 beta 1 doesn't work.

$ go version
go version go1.8beta1 linux/amd64
$ go install github.com/gonum/floats
# github.com/gonum/internal/asm
usage: asm [options] file.s
Flags:
  -D value
    	predefined symbol with optional simple value -D=identifier=value; can be set multiple times
  -I value
    	include directory; can be set multiple times
  -S	print assembly and machine code
  -debug
    	dump instructions as they are parsed
  -dynlink
    	support references to Go symbols defined in other shared libraries
  -e	no limit on number of errors reported
  -o string
    	output file; default foo.6 for /a/b/c/foo.s on amd64
  -shared
    	generate code that can be linked into a shared library
  -trimpath string
    	remove prefix from recorded source file paths

With go1.7.1 it works ok.

$ go version
go version go1.7.1 linux/amd64
$ go install github.com/gonum/floats
$

Checked on revision 856ee81.

The doc for Sub(s, t) states that the first argument is subtracted from the second. This implies that it computes (t-s) when it actually computes (s-t).