using System;
using System.Runtime.CompilerServices;
class Program
{
struct S { public long A; public long B; public long C; }
[MethodImpl(MethodImplOptions.NoInlining)]
static long Combine(S s, long a, long b) => s.A + s.B + s.C + a + b;
[MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
static long Test(S input)
{
S s = input;
input.A = 42;
long p = s.A;
return Combine(s, p, p);
}
static void Main() => Console.WriteLine(Test(new S { A = 1, B = 2, C = 3 }));
}Expected output: 8
Actual output: 6
windows-x64, main @ a0b86b1.
Goes away with DOTNET_JitNoForwardSub=1.
Expected output:
8Actual output:
6windows-x64, main @ a0b86b1.
Goes away with
DOTNET_JitNoForwardSub=1.