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runtime: incorporate hbits advancement in scanobject into loop

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This makes it clearer that i and hbits advance together.
As a bonus, it generates slightly better code.

Change-Id: I24d51102535c39f962a59c1a4a7c5c894339aa18
Reviewed-on: https://go-review.googlesource.com/c/go/+/309569
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Josh Bleecher Snyder 2021-03-15 16:15:23 -07:00
parent 7ec7a3cf33
commit 72483de87a
1 changed files with 1 additions and 6 deletions
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7
src/runtime/mgcmark.go
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@ -1257,12 +1257,7 @@ func scanobject(b uintptr, gcw *gcWork) {
}
var i uintptr
for i = 0; i < n; i += sys.PtrSize {
// Find bits for this word.
if i != 0 {
// Avoid needless hbits.next() on last iteration.
hbits = hbits.next()
}
for i = 0; i < n; i, hbits = i+sys.PtrSize, hbits.next() {
// Load bits once. See CL 22712 and issue 16973 for discussion.
bits := hbits.bits()
if bits&bitScan == 0 {