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runtime: process ptr bitmaps one word at a time

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[This is a retry of CL 407036 + its revert CL 422394. The only
content change is the 1-line change in cmd/internal/obj/objfile.go.]

Read the bitmaps one uintptr at a time instead of one byte at a time.

Performance so far:
 Allocation heavy, no retention: ~30% faster in heapBitsSetType
 Scan heavy, ~no allocation: ~even in scanobject

Change-Id: I04d899e1dbd23e989e9f552cdc1880318779c14c
Reviewed-on: https://go-review.googlesource.com/c/go/+/422635
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Keith Randall 2022-05-06 18:40:17 -07:00
parent 6a9c674a09
commit e49e876455
4 changed files with 91 additions and 18 deletions
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1
src/cmd/internal/obj/objfile.go
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@ -354,7 +354,6 @@ func (w *writer) Sym(s *LSym) {
case strings.HasPrefix(s.Name, "go:string."),
strings.HasPrefix(name, "type:.namedata."),
strings.HasPrefix(name, "type:.importpath."),
strings.HasPrefix(name, "runtime.gcbits."),
strings.HasSuffix(name, ".opendefer"),
strings.HasSuffix(name, ".arginfo0"),
strings.HasSuffix(name, ".arginfo1"),