runtime: iterate over set bits in adjustpointers
There are several things combined in this change. First, eliminate the gobitvector type in favor of adding a ptrbit method to bitvector. In non-performance-critical code, use that method. In performance critical code, though, load the bitvector data one byte at a time and iterate only over set bits. To support that, add and use sys.Ctz8. name old time/op new time/op delta StackCopyPtr-8 81.8ms ± 5% 78.9ms ± 3% -3.58% (p=0.000 n=97+96) StackCopy-8 65.9ms ± 3% 62.8ms ± 3% -4.67% (p=0.000 n=96+92) StackCopyNoCache-8 105ms ± 3% 102ms ± 3% -3.38% (p=0.000 n=96+95) Change-Id: I00b80f45612708bd440b1a411a57fa6dfa24aa74 Reviewed-on: https://go-review.googlesource.com/109716 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Austin Clements <austin@google.com>
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