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cmd/compile: mark architecture-specific unsafe points

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Introduce a mechanism for marking architecture-specific Ops
unsafe. And mark ones that use REGTMP on ARM64, as for async
preemption we will be using REGTMP as a temporary register in the
injected call.

Change-Id: I8ff22e87d8f9cb10d02a2f0af7c12ad6d7d58f54
Reviewed-on: https://go-review.googlesource.com/c/go/+/203459
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Cherry Zhang 2019-10-25 00:51:10 -04:00
parent 0f992b9948
commit 4a7ed1fab7
5 changed files with 32 additions and 8 deletions
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9
src/cmd/compile/internal/gc/plive.go
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@ -639,6 +639,15 @@ func (lv *Liveness) markUnsafePoints() {
lv.unsafePoints = bvalloc(int32(lv.f.NumValues()))
// Mark architecture-specific unsafe pointes.
for _, b := range lv.f.Blocks {
for _, v := range b.Values {
if v.Op.UnsafePoint() {
lv.unsafePoints.Set(int32(v.ID))
}
}
}
// Mark write barrier unsafe points.
for _, wbBlock := range lv.f.WBLoads {
if wbBlock.Kind == ssa.BlockPlain && len(wbBlock.Values) == 0 {