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cmd/compile: fix scheduling of memory-producing tuple ops
Intrinsified atomic op produces <value,memory>. Make sure this memory is considered in the store chain calculation. Fixes #16948. Change-Id: I029f164b123a7e830214297f8373f06ea0bf1e26 Reviewed-on: https://go-review.googlesource.com/28350 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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@ -128,9 +128,13 @@ func schedule(f *Func) {
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// the calculated store chain is good only for this block.
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for _, v := range b.Values {
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if v.Op != OpPhi && v.Type.IsMemory() {
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mem := v
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if v.Op == OpSelect1 {
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v = v.Args[0]
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}
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for _, w := range v.Args {
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if w.Type.IsMemory() {
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nextMem[w.ID] = v
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nextMem[w.ID] = mem
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}
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}
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}
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34
test/fixedbugs/issue16948.go
Normal file
34
test/fixedbugs/issue16948.go
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@ -0,0 +1,34 @@
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// run
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// issue 16948: make sure intrinsified atomic ops won't
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// confuse the scheduler.
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package main
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import "sync/atomic"
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func main() {
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f()
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}
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var x int32
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type T [10]int
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var sink *T
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func f() (t T) {
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atomic.AddInt32(&x, 1)
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g(42, 42, 42, 42, 42, &t) // use int values that is invalid pointer to smash the stack slot of return value of runtime.newobject
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return
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}
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//go:noinline
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func g(a, b, c, d, e int, p *T) {
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var t [10000]int // a large stack frame to trigger stack growing
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_ = t
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sink = p // force p (in caller) heap allocated
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}
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