e90e7a59dc
First, we can lift the enc.decodeMap nil check out of the loop. Second, we can make it clear to the compiler that 'in := src[0]' doesn't need a bounds check, by making len(src)==0 a single if check that always stops the loop. This is by far the largest speed-up. Third, we can use a dst slice index instead of reslicing dst, which removes work from the loop body. While at it, we can merge the two 'switch dlen' pieces of code, which simplifies the code and doesn't affect performance. name old time/op new time/op delta DecodeString-8 80.2µs ± 0% 67.5µs ± 0% -15.81% (p=0.002 n=6+6) name old speed new speed delta DecodeString-8 163MB/s ± 0% 194MB/s ± 0% +18.78% (p=0.002 n=6+6) Change-Id: Iefeaae94c03453f8760452b1da706a77b3522718 Reviewed-on: https://go-review.googlesource.com/c/154422 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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