Assertion failed 'node->IsUnusedValue() && "found an unmarked unused value"' during 'Lowering nodeinfo'

[kunalspathak]

// Found by Antigen


using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
using System.Numerics;
public class TestClass
{
 public struct S4
 {
 public struct S4_D1_F2
 {
 }
 public struct S4_D1_F4
 {
 }
 }
 public struct S5
 {
 }
 static int s_int_21 = 2;
 static S4.S4_D1_F2 s_s4_s4_d1_f2_68 = new S4.S4_D1_F2();
 int int_79 = 4;
 Vector256<float> v256_float_115 = Vector256.Create(4f);
 S4.S4_D1_F2 s4_s4_d1_f2_126 = new S4.S4_D1_F2();
 S4.S4_D1_F4 s4_s4_d1_f4_128 = new S4.S4_D1_F4();
 static int s_loopInvariant = 5;
 public S4.S4_D1_F2 Method1(long p_long_131, S5 p_s5_132, S4.S4_D1_F4 p_s4_s4_d1_f4_133)
 {
 unchecked
 {
 switch (15&4)
 {
 case 4:
 {
 for (;;)
 {
 switch (int_79 - (s_int_21 >>= 15*4))
 {
 case 2:
 {
 while (15>4|| 15<=4)
 {
 while (Vector256.ToScalar(v256_float_115) != 15%4&& 15!=4)
{} }
 break;
 }
 case -2147483647:
 {
 try
 {
 int __loopvar7 = s_loopInvariant;
 }
 catch (System.ArithmeticException)
 {
 while ((15|4)<= 15+4)
 {
 }
 }
 break;
 }
 case -5:
 {
 break;
 }
 default:
 {
 break;
 }
 }
 }
 break;
 }
 default:
 {
 break;
 }
 }
 return s_s4_s4_d1_f2_68;
 }
 }
 public void Method0()
 {
 unchecked
 {
 long long_205 = 5;
 S5 s5_228 = new S5();
 s4_s4_d1_f2_126 = Method1(long_205, s5_228, s4_s4_d1_f4_128);
 return;
 }
 }
 public static void Main(string[] args)
 {
 new TestClass().Method0();
 }
}
/*

Environment:

set COMPlus_JitNoCSE2=1
set COMPlus_JitDoAssertionProp=0

Assert failure(PID 4736 [0x00001280], Thread: 35412 [0x8a54]): Assertion failed 'node->IsUnusedValue() && "found an unmarked unused value"' in 'TestClass:Method1(long,TestClass+S5,TestClass+S4+S4_D1_F4):TestClass+S4+S4_D1_F2:this' during 'Lowering nodeinfo' (IL size 71; hash 0x280a50f7; Tier0-FullOpts)
 File: D:\git\runtime\src\coreclr\jit\lir.cpp Line: 1691
 Image: D:\git\runtime\artifacts\tests\coreclr\windows.x64.Checked\tests\Core_Root\CoreRun.exe
*/

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Issue Details

---

// Found by Antigen


using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
using System.Numerics;
public class TestClass
{
 public struct S4
 {
 public struct S4_D1_F2
 {
 }
 public struct S4_D1_F4
 {
 }
 }
 public struct S5
 {
 }
 static int s_int_21 = 2;
 static S4.S4_D1_F2 s_s4_s4_d1_f2_68 = new S4.S4_D1_F2();
 int int_79 = 4;
 Vector256<float> v256_float_115 = Vector256.Create(4f);
 S4.S4_D1_F2 s4_s4_d1_f2_126 = new S4.S4_D1_F2();
 S4.S4_D1_F4 s4_s4_d1_f4_128 = new S4.S4_D1_F4();
 static int s_loopInvariant = 5;
 public S4.S4_D1_F2 Method1(long p_long_131, S5 p_s5_132, S4.S4_D1_F4 p_s4_s4_d1_f4_133)
 {
 unchecked
 {
 switch (15&4)
 {
 case 4:
 {
 for (;;)
 {
 switch (int_79 - (s_int_21 >>= 15*4))
 {
 case 2:
 {
 while (15>4|| 15<=4)
 {
 while (Vector256.ToScalar(v256_float_115) != 15%4&& 15!=4)
{} }
 break;
 }
 case -2147483647:
 {
 try
 {
 int __loopvar7 = s_loopInvariant;
 }
 catch (System.ArithmeticException)
 {
 while ((15|4)<= 15+4)
 {
 }
 }
 break;
 }
 case -5:
 {
 break;
 }
 default:
 {
 break;
 }
 }
 }
 break;
 }
 default:
 {
 break;
 }
 }
 return s_s4_s4_d1_f2_68;
 }
 }
 public void Method0()
 {
 unchecked
 {
 long long_205 = 5;
 S5 s5_228 = new S5();
 s4_s4_d1_f2_126 = Method1(long_205, s5_228, s4_s4_d1_f4_128);
 return;
 }
 }
 public static void Main(string[] args)
 {
 new TestClass().Method0();
 }
}
/*

Environment:

set COMPlus_JitNoCSE2=1
set COMPlus_JitDoAssertionProp=0

Assert failure(PID 4736 [0x00001280], Thread: 35412 [0x8a54]): Assertion failed 'node->IsUnusedValue() && "found an unmarked unused value"' in 'TestClass:Method1(long,TestClass+S5,TestClass+S4+S4_D1_F4):TestClass+S4+S4_D1_F2:this' during 'Lowering nodeinfo' (IL size 71; hash 0x280a50f7; Tier0-FullOpts)
 File: D:\git\runtime\src\coreclr\jit\lir.cpp Line: 1691
 Image: D:\git\runtime\artifacts\tests\coreclr\windows.x64.Checked\tests\Core_Root\CoreRun.exe
*/

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

[jakobbotsch]

I'll take a look at this one.