| commit | 304f769ffc68e64244266b3aadbf91e6738c0064 | [log] [tgz] |
|---|---|---|
| author | Keith Randall <khr@golang.org> | Thu Jan 07 14:57:53 2021 -0800 |
| committer | Keith Randall <khr@golang.org> | Fri Jan 08 05:00:06 2021 +0000 |
| tree | fe443868201a208fac12c485149f7922416d4c57 | |
| parent | ae9771713383c1ee01a544cd50cfdbc22841380a [diff] |
cmd/compile: don't short-circuit copies whose source is volatile Current optimization: When we copy a->b and then b->c, we might as well copy a->c instead of b->c (then b might be dead and go away). *Except* if a is a volatile location (might be clobbered by a call). In that case, we really do want to copy a immediately, because there might be a call before we can do the a->c copy. User calls can't happen in between, because the rule matches up the memory states. But calls inserted for memory barriers, particularly runtime.typedmemmove, can. (I guess we could introduce a register-calling-convention version of runtime.typedmemmove, but that seems a bigger change than this one.) Fixes #43570 Change-Id: Ifa518bb1a6f3a8dd46c352d4fd54ea9713b3eb1a Reviewed-on: https://go-review.googlesource.com/c/go/+/282492 Trust: Keith Randall <khr@golang.org> Trust: Josh Bleecher Snyder <josharian@gmail.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
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