1028d973d2
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>
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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