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doc: add release notes for hot block alignment

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This is for the changes in CL 577935.

Change-Id: I8f70dd36c89aaede11a37744c0f279439e01eb13
Reviewed-on: https://go-review.googlesource.com/c/go/+/586895
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
David Chase 2024-05-20 14:21:30 -04:00
parent 183b6b4963
commit 1028d973d2
1 changed files with 7 additions and 0 deletions
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doc/next/5-toolchain.md
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@ -9,6 +9,13 @@ The compiler in Go 1.23 can now overlap the stack frame slots of local variables
accessed in disjoint regions of a function, which reduces stack usage accessed in disjoint regions of a function, which reduces stack usage
for Go applications. for Go applications.
<!-- https://go.dev/cl/577935 -->
For 386 and amd64, the compiler will use information from PGO to align certain
hot blocks in loops. This improves performance an additional 1-1.5% at
a cost of an additional 0.1% text and binary size. This is currently only implemented
on 386 and amd64 because it has not shown an improvement on other platforms.
Hot block alignment can be disabled with `-gcflags=[<packages>=]-d=alignhot=0`
## Assembler {#assembler} ## Assembler {#assembler}
## Linker {#linker} ## Linker {#linker}