tree a75ad1fde9937d7c0a15b42479b610333fb65c4a
parent e9c2607ab47b63993cb5ee54c934d67baba7fc95
author Keith Randall <khr@golang.org> 1679415943 -0700
committer Keith Randall <khr@golang.org> 1682111146 +0000

cmd/compile: introduce separate memory op combining pass

Memory op combining is currently done using arch-specific rewrite rules.
Instead, do them as a arch-independent rewrite pass. This ensures that
all architectures (with unaligned loads & stores) get equal treatment.

This removes a lot of rewrite rules.

The new pass is a bit more comprehensive. It handles things like out-of-order
writes and is careful not to apply partial optimizations that then block
further optimizations.

Change-Id: I780ff3bb052475cd725a923309616882d25b8d9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/478475
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>