At Fri, 6 Nov 2020 12:45:46 -0700, Matthew Flatt wrote:
> I will investigate faster option. A primitive without conversion could
> make the safe `flvector-set!` slightly faster, too, by avoiding a
> redundant check.
Long story short, I added flvectors to the Chez Scheme level as of
v7.9.0.4. With that change, `flvector-set!` is faster, and
`flvector-ref` and `flvector-set!` cooperate better with flonum
unboxing.
For example, this microbenchmark now avoids allocation and runs about 8
times as fast:
(let ([v (make-flvector 100)])
(time
(for ([j (in-range 100000)])
(for ([i (in-range (flvector-length v))])
(flvector-set! v i (fl+ 1.0 (flvector-ref v i)))))))
Also, your program now crashes as you intended.
(To make room in Chez Scheme's type encoding for flvectors, I removed
immutable fxvectors. Immutable fxvectors do not seem useful, and
there's no such thing at the Racket level.)
Matthew
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