JIT: Assertion failed '!"Write to unaliased local overlaps outstanding read"' during 'Rationalize IR'

[jakobbotsch]

Created based on an example generated by Antigen.

using System.Runtime.CompilerServices;

public class Program
{
 public static void Main(string[] args)
 {
 S s = default;
 if (args.Length > 0)
 {
 s.A = 1234;
 }

 Foo(0, 0, s, s);
 }

 [MethodImpl(MethodImplOptions.NoInlining)]
 private static void Foo(int a, int b, S s1, S s2)
 {
 }

 public struct S
 {
 public int A;
 }
}

Run on win-x86 with

$env:DOTNET_JitNoCse=1
$env:DOTNET_JitStressModeNames="STRESS_NO_OLD_PROMOTION STRESS_PHYSICAL_PROMOTION_COST"
$env:DOTNET_TieredCompilation=0

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Issue Details

---

Created based on an example generated by Antigen.

using System.Runtime.CompilerServices;

public class Program
{
 public static void Main(string[] args)
 {
 S s = default;
 if (args.Length > 0)
 {
 s.A = 1234;
 }

 Foo(0, 0, s, s);
 }

 [MethodImpl(MethodImplOptions.NoInlining)]
 private static void Use(int x)
 {
 }

 [MethodImpl(MethodImplOptions.NoInlining)]
 private static void Foo(int a, int b, S s1, S s2)
 {
 }

 public struct S
 {
 public int A;
 }
}

Run with

$env:DOTNET_JitNoCse=1
$env:DOTNET_JitStressModeNames="STRESS_NO_OLD_PROMOTION STRESS_PHYSICAL_PROMOTION_COST"
$env:DOTNET_TieredCompilation=0

Author:	jakobbotsch
Assignees:	-
Labels:	area-CodeGen-coreclr, untriaged
Milestone:	-