From 47ab3d4a42e9ab51c465c4322d2ec233f6324e6b Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:16:40 +0200 Subject: Adding upstream version 1.18.10. Signed-off-by: Daniel Baumann --- test/fixedbugs/issue30977.go | 52 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 test/fixedbugs/issue30977.go (limited to 'test/fixedbugs/issue30977.go') diff --git a/test/fixedbugs/issue30977.go b/test/fixedbugs/issue30977.go new file mode 100644 index 0000000..2ca040d --- /dev/null +++ b/test/fixedbugs/issue30977.go @@ -0,0 +1,52 @@ +// run + +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Issue 30977: write barrier call clobbers volatile +// value when there are multiple uses of the value. + +package main + +import "runtime" + +type T struct { + a, b, c, d, e string +} + +//go:noinline +func g() T { + return T{"a", "b", "c", "d", "e"} +} + +//go:noinline +func f() { + // The compiler optimizes this to direct copying + // the call result to both globals, with write + // barriers. The first write barrier call clobbers + // the result of g on stack. + X = g() + Y = X +} + +var X, Y T + +const N = 1000 + +func main() { + // Keep GC running so the write barrier is on. + go func() { + for { + runtime.GC() + } + }() + + for i := 0; i < N; i++ { + runtime.Gosched() + f() + if X != Y { + panic("FAIL") + } + } +} -- cgit v1.2.3