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go/test/fixedbugs/issue29943.go

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// 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.
// Code was miscompiled on ppc64le due to incorrect zero-extension
// that was CSE'd.
package main
//go:noinline
func g(i uint64) uint64 {
return uint64(uint32(i))
}
var sink uint64
func main() {
for i := uint64(0); i < 1; i++ {
i32 := int32(i - 1)
sink = uint64((uint32(i32) << 1) ^ uint32((i32 >> 31)))
x := g(uint64(i32))
if x != uint64(uint32(i32)) {
panic(x)
}
}
}