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| author | Cherry Zhang <cherryyz@google.com> | 2019-10-28 00:50:39 -0400 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2019-11-07 19:20:35 +0000 |
| commit | ceca99bdebf1154879288d108c8506372e1a0173 (patch) | |
| tree | 86e605208452c73910534e1c4b6b893dcb6f70a8 /src/cmd/compile/internal/ssa/opGen.go | |
| parent | 24e549a717d1e083e7bef9003bce124294e9e975 (diff) | |
| download | go-ceca99bdebf1154879288d108c8506372e1a0173.tar.gz go-ceca99bdebf1154879288d108c8506372e1a0173.zip | |
cmd/compile, cmd/internal/obj/ppc64: mark unsafe points
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>
Diffstat (limited to 'src/cmd/compile/internal/ssa/opGen.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/opGen.go | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/opGen.go b/src/cmd/compile/internal/ssa/opGen.go index b5b2c1d406..047a2a5573 100644 --- a/src/cmd/compile/internal/ssa/opGen.go +++ b/src/cmd/compile/internal/ssa/opGen.go @@ -24566,6 +24566,7 @@ var opcodeTable = [...]opInfo{ argLen: 2, clobberFlags: true, faultOnNilArg0: true, + unsafePoint: true, reg: regInfo{ inputs: []inputInfo{ {0, 8}, // R3 @@ -24580,6 +24581,7 @@ var opcodeTable = [...]opInfo{ clobberFlags: true, faultOnNilArg0: true, faultOnNilArg1: true, + unsafePoint: true, reg: regInfo{ inputs: []inputInfo{ {0, 8}, // R3 |