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. I am using go build -gcflags="-d=ssa/check_bce/debug=1" to check for the bound checks. What am I missing here? Any suggestions on how to make this work? And while we are at it, adding goroutines to convert partitions of the image also helps (2 goroutines gives a 50% increase in performance more or less). Other these 2 things, any other suggestion s0on how to make it faster? Thanks in advance. -- 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/CAEd86TzSSNfRrCV7ZhTf_KGo_dxKon2vxysghTeYDiMdFxp9sw%40mail.gmail.com.
