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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Numerics;
using System.Runtime.CompilerServices;
namespace N
{
public static class C
{
// This is a regression test for a failure in loop unrolling when
// the unrolled loop contains a switch statement.
[MethodImpl(MethodImplOptions.NoInlining)]
static int Test()
{
int s = 0;
// Loop to some Vector<T>.Count to trigger unrolling.
for (int i = 0; i < Vector<int>.Count; i++)
{
// Loop contains switch; the bug was that the clones
// of the switch were all sharing its BBswtDesc instead
// of getting their own, so updates to their jump targets
// were incorrectly shared.
switch (i)
{
case 1: s += 4; break;
case 2: s += 2; break;
case 3: s += i; break;
}
}
return s;
}
public static int Main(string[] args)
{
int result = Test();
// Expected result is a function of Vector<int>.Count.
int expected;
switch(Vector<int>.Count)
{
case 1:
expected = 4;
break;
case 2:
expected = 6;
break;
default:
expected = 9;
break;
}
// Return 100 on success (result == expected), other
// values on failure.
return 100 + result - expected;
}
}
}
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