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(1:9, 3)
> 
> x_y = x %*% y
> 
> xs = fl(x)
> ys = fl(y)
> 
> test = dbl(xs %*% ys)
> stopifnot(all.equal(test, x_y))
> 
> test = dbl(xs %*% y)
> stopifnot(all.equal(test, x_y))
> 
> test = dbl(x %*% ys)
> stopifnot(all.equal(test, x_y))
> 
> 
> 
> storage.mode(x) = "double"
> storage.mode(y) = "double"
> 
> test = xs %*% y
> stopifnot(all.equal(test, x_y))
> 
> test = x %*% ys
> stopifnot(all.equal(test, x_y))
> 
> proc.time()
   user  system elapsed 
   0.28    0.06    0.34