R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(float))
> 
> x = matrix(1:30, 10)
> y = matrix(1:10, 10, 2)
> z = matrix(1:5, 5, 3)
> 
> xs = fl(x)
> ys = fl(y)
> zs = fl(z)
> 
> cpxy = crossprod(x, y)
> tcpxz = tcrossprod(x, z)
> 
> 
> test = dbl(crossprod(xs))
> stopifnot(all.equal(test, crossprod(x)))
> 
> test = dbl(crossprod(xs, ys))
> stopifnot(all.equal(test, cpxy))
> 
> test = crossprod(x, ys)
> stopifnot(all.equal(test, cpxy))
> 
> test = crossprod(xs, y)
> stopifnot(all.equal(test, cpxy))
> 
> 
> 
> test = dbl(tcrossprod(xs))
> stopifnot(all.equal(test, tcrossprod(x)))
> 
> test = dbl(tcrossprod(xs, zs))
> stopifnot(all.equal(test, tcpxz))
> 
> test = tcrossprod(x, zs)
> stopifnot(all.equal(test, tcpxz))
> 
> test = tcrossprod(xs, z)
> stopifnot(all.equal(test, tcpxz))
> 
> proc.time()
   user  system elapsed 
   0.26    0.04    0.32