acc93dac83
This is the first round of TODOs created based on relnote todo output. There are many entries that need to be documented, expanded, reworded, and this change makes progress on setting that up. For this cycle, relnote todo implemented a simple heuristic of finding CLs that mention accepted proposals (see issue 62376, or comment https://go.dev/issue/62376#issuecomment-2101086794 specifically). The "Items that don't need to be mentioned in Go 1.23 release notes but are picked up by relnote todo." section in todo.md contains an attempt at reviewing that list. The large number of items needed to be reviewed made it impractical to spend much time on any individual one. For #65614. Change-Id: Id9d5f1795575a46df2ec4ed0088de07ee6075a90 Reviewed-on: https://go-review.googlesource.com/c/go/+/588015 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Carlos Amedee <carlos@golang.org>
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Compiler
The build time overhead to building with Profile Guided Optimization has been reduced significantly. Previously, large builds could see 100%+ build time increase from enabling PGO. In Go 1.23, overhead should be in the single digit percentages.
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 for Go applications.
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
Linker
TODO: Say what needs to be said in Go 1.23 release notes regarding the locking down of future linkname uses.
The new -bindnow flag enables full RELRO on ELF targets.