ceca99bdeb
We'll use CTR as a scratch register for call injection. Mark code sequences that use CTR as unsafe for async preemption. Currently it is only used in LoweredZero and LoweredMove. It is unfortunate that they are nonpreemptible. But I think it is still better than using LR for call injection and marking all leaf functions nonpreemptible. Also mark the prologue of large frame functions nonpreemptible, as we write below SP. Change-Id: I05a75431499f3f4b2f23651a7b17f7fcf2afbe06 Reviewed-on: https://go-review.googlesource.com/c/go/+/203823 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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