b589208c8c
Use just 1 bit per word to record the ptr/nonptr bitmap. Use word-sized operations to manipulate the bitmap, so we can operate on up to 64 ptr/nonptr bits at a time. Use a separate bitmap, one bit per word of the ptr/nonptr bitmap, to encode a no-more-pointers signal. Since we can check 64 ptr/nonptr bits at once, knowing the exact last pointer location is not necessary. This cleans up the bitmap implementation significantly, which will hopefully make it faster. TODO: measure As a followon CL, we should make the gcdata bitmap an array of uintptr instead of an array of byte, so we can load 64 bits of it at once. Similarly for the processing of gc programs. Change-Id: I18151b1876d9543599800dec51e2a1b19df97d49 Reviewed-on: https://go-review.googlesource.com/c/go/+/407035 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Keith Randall <khr@google.com> |
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