On Fri, Feb 21, 2020 at 5:36 PM Bruno Albuquerque <b...@gmail.com> wrote:
> I wrote some simple code to convert a RGB24 image represented as a []byte > to a NRGBA image (also as a []byte), like so: > > https://play.golang.org/p/Y7ICg7t4_nd > > Unfortunately, the performance is lacking here and I am trying to improve > it. The first low hanging fruit seems to be taking advantage of BCE: > > $go test -bench . > goos: linux > goarch: amd64 > BenchmarkNRGBA-8 484 2636344 ns/op > > $ go test -gcflags="-B" -bench . > goos: linux > goarch: amd64 > BenchmarkNRGBA-8 855 1654882 ns/op > > Unfortunately, I could not find an incantation that would remove the bound > checks. My naive attempt was to just do > > _ = nrgbaData[len(nrgbaData)-1] > > at around line 7 in the program above but this did not help and added one > extra bound check. > > Funny enough, if I do > > _ = nrgbaData[len(nrgbaData)] > > all the bound checks seem to be eliminated but, obviously, the program > panics at this line. > what about: _ = nrgbaData[:len(nrgbaData)] does this also remove the bound checks? -s -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAAV3P_CEHU%3D-BhhsPyjKZBuDDQDMGMsdFheA8EzALQvF61n87Q%40mail.gmail.com.
