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Stop spilling ldvirtftn #120866

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1c781c1
Stop spilling ldvirtftn
hez2010 Oct 18, 2025
a2a1d86
Try fixing assertion
hez2010 Oct 18, 2025
bdcaf94
Merge branch 'main' into ldvirtftn-no-spill
hez2010 Oct 18, 2025
98f9883
Merge branch 'main' into ldvirtftn-no-spill
hez2010 Oct 19, 2025
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4 changes: 2 additions & 2 deletions src/coreclr/inc/corinfo.h
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Expand Up @@ -1522,7 +1522,7 @@ struct CORINFO_DEVIRTUALIZATION_INFO
// - If pResolvedTokenDevirtualizedMethod is not set to NULL and targeting an R2R image
// use it as the parameter to getCallInfo
// - isInstantiatingStub is set to TRUE if the devirtualized method is a generic method instantiating stub
// - wasArrayInterfaceDevirt is set TRUE for array interface method devirtualization
// - needsMethodContext is set TRUE if the devirtualized method requires a method context
// (in which case the method handle and context will be a generic method)
//
CORINFO_METHOD_HANDLE devirtualizedMethod;
Expand All @@ -1531,7 +1531,7 @@ struct CORINFO_DEVIRTUALIZATION_INFO
CORINFO_RESOLVED_TOKEN resolvedTokenDevirtualizedMethod;
CORINFO_RESOLVED_TOKEN resolvedTokenDevirtualizedUnboxedMethod;
bool isInstantiatingStub;
bool wasArrayInterfaceDevirt;
bool needsMethodContext;
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@hez2010 hez2010 Oct 18, 2025 •
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This is just a rename without any meaningful change.

};

//----------------------------------------------------------------------------
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2 changes: 1 addition & 1 deletion src/coreclr/jit/compiler.hpp
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Expand Up @@ -1606,7 +1606,7 @@ inline GenTreeCall* Compiler::gtNewHelperCallNode(
/*****************************************************************************/

//------------------------------------------------------------------------------
// gtNewHelperCallNode : Helper to create a call helper node.
// gtNewVirtualFunctionLookupHelperCallNode : Helper to create a virtual function lookup helper node.
//
//
// Arguments:
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41 changes: 22 additions & 19 deletions src/coreclr/jit/importercalls.cpp
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Expand Up @@ -400,23 +400,26 @@ var_types Compiler::impImportCall(OPCODE opcode,
thisPtr = impTransformThis(thisPtr, pConstrainedResolvedToken, callInfo->thisTransform);
assert(thisPtr != nullptr);

GenTree* origThisPtr = thisPtr;
// Clone the (possibly transformed) "this" pointer
GenTree* thisPtrCopy;
thisPtr =
impCloneExpr(thisPtr, &thisPtrCopy, CHECK_SPILL_ALL, nullptr DEBUGARG("LDVIRTFTN this pointer"));

// We cloned the "this" pointer, mark it as a single def and set the class for it
if (thisPtr->TypeIs(TYP_REF) && (origThisPtr != thisPtr))
{
lvaGetDesc(thisPtr->AsLclVar())->lvSingleDef = 1;
lvaSetClass(thisPtr->AsLclVar()->GetLclNum(), origThisPtr);
}

GenTree* fptr = impImportLdvirtftn(thisPtr, pResolvedToken, callInfo);
assert(fptr != nullptr);

call->AsCall()
->gtArgs.PushFront(this, NewCallArg::Primitive(thisPtrCopy).WellKnown(WellKnownArg::ThisPointer));

// Now make an indirect call through the function pointer

unsigned lclNum = lvaGrabTemp(true DEBUGARG("VirtualCall through function pointer"));
impStoreToTemp(lclNum, fptr, CHECK_SPILL_ALL);
fptr = gtNewLclvNode(lclNum, TYP_I_IMPL);
Comment on lines -416 to -418
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This is the only actual change.


call->AsCall()->gtCallAddr = fptr;
call->gtFlags |= GTF_EXCEPT | (fptr->gtFlags & GTF_GLOB_EFFECT);

Expand Down Expand Up @@ -7603,7 +7606,7 @@ void Compiler::considerGuardedDevirtualization(GenTreeCall* call,
}

addGuardedDevirtualizationCandidate(call, exactMethod, exactCls, exactContext, exactMethodAttrs,
clsAttrs, likelyHood, dvInfo.wasArrayInterfaceDevirt,
clsAttrs, likelyHood, dvInfo.needsMethodContext,
dvInfo.isInstantiatingStub, baseMethod, originalContext);
}

Expand Down Expand Up @@ -7676,7 +7679,7 @@ void Compiler::considerGuardedDevirtualization(GenTreeCall* call,

likelyContext = dvInfo.exactContext;
likelyMethod = dvInfo.devirtualizedMethod;
arrayInterface = dvInfo.wasArrayInterfaceDevirt;
arrayInterface = dvInfo.needsMethodContext;
instantiatingStub = dvInfo.isInstantiatingStub;
}
else
Expand Down Expand Up @@ -8767,14 +8770,14 @@ void Compiler::impDevirtualizeCall(GenTreeCall* call,

if (((size_t)exactContext & CORINFO_CONTEXTFLAGS_MASK) == CORINFO_CONTEXTFLAGS_CLASS)
{
assert(!dvInfo.wasArrayInterfaceDevirt);
assert(!dvInfo.needsMethodContext);
derivedClass = (CORINFO_CLASS_HANDLE)((size_t)exactContext & ~CORINFO_CONTEXTFLAGS_MASK);
}
else
{
// Array interface devirt can return a nonvirtual generic method of the non-generic SZArrayHelper class.
//
assert(dvInfo.wasArrayInterfaceDevirt);
assert(dvInfo.needsMethodContext);
assert(((size_t)exactContext & CORINFO_CONTEXTFLAGS_MASK) == CORINFO_CONTEXTFLAGS_METHOD);
derivedClass = info.compCompHnd->getMethodClass(derivedMethod);
}
Expand All @@ -8795,9 +8798,9 @@ void Compiler::impDevirtualizeCall(GenTreeCall* call,

if (dvInfo.isInstantiatingStub)
{
// We should only end up with generic methods for array interface devirt.
// We should only end up with generic methods that needs a method context (eg. array interface).
//
assert(dvInfo.wasArrayInterfaceDevirt);
assert(dvInfo.needsMethodContext);

// We don't expect NAOT to end up here, since it has Array<T>
// and normal devirtualization.
Expand Down Expand Up @@ -8920,14 +8923,6 @@ void Compiler::impDevirtualizeCall(GenTreeCall* call,

JITDUMP(" %s; can devirtualize\n", note);

// Make the updates.
call->gtFlags &= ~GTF_CALL_VIRT_VTABLE;
call->gtFlags &= ~GTF_CALL_VIRT_STUB;
call->gtCallMethHnd = derivedMethod;
call->gtCallType = CT_USER_FUNC;
call->gtControlExpr = nullptr;
INDEBUG(call->gtCallDebugFlags |= GTF_CALL_MD_DEVIRTUALIZED);

if (dvInfo.isInstantiatingStub)
{
// Pass the instantiating stub method desc as the inst param arg.
Expand All @@ -8939,6 +8934,14 @@ void Compiler::impDevirtualizeCall(GenTreeCall* call,
call->gtArgs.InsertInstParam(this, instParam);
}

// Make the updates.
call->gtFlags &= ~GTF_CALL_VIRT_VTABLE;
call->gtFlags &= ~GTF_CALL_VIRT_STUB;
call->gtCallMethHnd = derivedMethod;
call->gtCallType = CT_USER_FUNC;
call->gtControlExpr = nullptr;
INDEBUG(call->gtCallDebugFlags |= GTF_CALL_MD_DEVIRTUALIZED);

// Virtual calls include an implicit null check, which we may
// now need to make explicit.
if (!objIsNonNull)
Expand Down
1 change: 0 additions & 1 deletion src/coreclr/jit/lower.cpp
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Expand Up @@ -9451,7 +9451,6 @@ void Lowering::ContainCheckNode(GenTree* node)
ContainCheckIndir(node->AsIndir());
break;
case GT_PUTARG_REG:
case GT_PUTARG_STK:
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what is the motivation behind this change?

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It's trying to suppress an assertion before addressing the lowering issue that is specific to windows-x86:

15:32:19.222 Running test: JIT/Directed/tailcall/more_tailcalls/more_tailcalls.cmd

Assert failure(PID 204 [0x000000cc], Thread: 2564 [0x0a04]): Assertion failed 'node->GetRegNum() != REG_NA' in 'GenInstance`2[System.__Canon,int]:VirtForward[System.__Canon,System.__Canon](System.__Canon,int,System.__Canon,System.__Canon):System.String:this' during 'Lowering nodeinfo' (IL size 23; hash 0xb3dc36bf; FullOpts)

    File: D:\a\_work\1\s\src\coreclr\jit\lower.cpp:9445
    Image: C:\h\w\ABFD09AF\p\corerun.exe

15:36:59.890 Running test: JIT/Regression/JitBlue/Runtime_87393/Runtime_87393/Runtime_87393.cmd

Assert failure(PID 9576 [0x00002568], Thread: 9588 [0x2574]): Assertion failed 'node->GetRegNum() != REG_NA' in 'Runtime_87393.Bar:M2[int](int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int):int' during 'Lowering nodeinfo' (IL size 41; hash 0x12b37abb; FullOpts)

    File: D:\a\_work\1\s\src\coreclr\jit\lower.cpp:9445
    Image: C:\h\w\ABFD09AF\p\corerun.exe

// The regNum must have been set by the lowering of the call.
assert(node->GetRegNum() != REG_NA);
break;
Expand Down
2 changes: 1 addition & 1 deletion src/coreclr/tools/Common/JitInterface/CorInfoImpl.cs
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Expand Up @@ -1324,7 +1324,7 @@ private bool resolveVirtualMethod(CORINFO_DEVIRTUALIZATION_INFO* info)
info->exactContext = null;
info->detail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_UNKNOWN;
info->isInstantiatingStub = false;
info->wasArrayInterfaceDevirt = false;
info->needsMethodContext = false;

TypeDesc objType = HandleToObject(info->objClass);

Expand Down
6 changes: 3 additions & 3 deletions src/coreclr/tools/Common/JitInterface/CorInfoTypes.cs
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Expand Up @@ -1093,7 +1093,7 @@ public unsafe struct CORINFO_DEVIRTUALIZATION_INFO
// - exactContext is set to wrapped CORINFO_CLASS_HANDLE of devirt'ed method table.
// - detail describes the computation done by the jit host
// - isInstantiatingStub is set to TRUE if the devirtualized method is a method instantiation stub
// - wasArrayInterfaceDevirt is set TRUE for array interface method devirtualization
// - needsMethodContext is set TRUE if the devirtualized method requires a method context
// (in which case the method handle and context will be a generic method)
//
public CORINFO_METHOD_STRUCT_* devirtualizedMethod;
Expand All @@ -1103,8 +1103,8 @@ public unsafe struct CORINFO_DEVIRTUALIZATION_INFO
public CORINFO_RESOLVED_TOKEN resolvedTokenDevirtualizedUnboxedMethod;
public byte _isInstantiatingStub;
public bool isInstantiatingStub { get { return _isInstantiatingStub != 0; } set { _isInstantiatingStub = value ? (byte)1 : (byte)0; } }
public byte _wasArrayInterfaceDevirt;
public bool wasArrayInterfaceDevirt { get { return _wasArrayInterfaceDevirt != 0; } set { _wasArrayInterfaceDevirt = value ? (byte)1 : (byte)0; } }
public byte _needsMethodContext;
public bool needsMethodContext { get { return _needsMethodContext != 0; } set { _needsMethodContext = value ? (byte)1 : (byte)0; } }
}

//----------------------------------------------------------------------------
Expand Down
2 changes: 1 addition & 1 deletion src/coreclr/tools/superpmi/superpmi-shared/agnostic.h
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Expand Up @@ -680,7 +680,7 @@ struct Agnostic_ResolveVirtualMethodResult
bool returnValue;
DWORDLONG devirtualizedMethod;
bool isInstantiatingStub;
bool wasArrayInterfaceDevirt;
bool needsMethodContext;
DWORDLONG exactContext;
DWORD detail;
Agnostic_CORINFO_RESOLVED_TOKEN resolvedTokenDevirtualizedMethod;
Expand Down
8 changes: 4 additions & 4 deletions src/coreclr/tools/superpmi/superpmi-shared/methodcontext.cpp
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Expand Up @@ -3276,7 +3276,7 @@ void MethodContext::recResolveVirtualMethod(CORINFO_DEVIRTUALIZATION_INFO * info
result.isInstantiatingStub = info->isInstantiatingStub;
result.exactContext = CastHandle(info->exactContext);
result.detail = (DWORD) info->detail;
result.wasArrayInterfaceDevirt = info->wasArrayInterfaceDevirt;
result.needsMethodContext = info->needsMethodContext;

if (returnValue)
{
Expand All @@ -3301,11 +3301,11 @@ void MethodContext::dmpResolveVirtualMethod(const Agnostic_ResolveVirtualMethodK
key.context,
key.pResolvedTokenVirtualMethodNonNull,
key.pResolvedTokenVirtualMethodNonNull ? SpmiDumpHelper::DumpAgnostic_CORINFO_RESOLVED_TOKEN(key.pResolvedTokenVirtualMethod).c_str() : "???");
printf(", value returnValue-%s, devirtMethod-%016" PRIX64 ", instantiatingStub-%s, wasArrayInterfaceDevirt-%s, exactContext-%016" PRIX64 ", detail-%d, tokDvMeth{%s}, tokDvUnboxMeth{%s}",
printf(", value returnValue-%s, devirtMethod-%016" PRIX64 ", instantiatingStub-%s, needsMethodContext-%s, exactContext-%016" PRIX64 ", detail-%d, tokDvMeth{%s}, tokDvUnboxMeth{%s}",
result.returnValue ? "true" : "false",
result.devirtualizedMethod,
result.isInstantiatingStub ? "true" : "false",
result.wasArrayInterfaceDevirt ? "true" : "false",
result.needsMethodContext ? "true" : "false",
result.exactContext,
result.detail,
result.returnValue ? SpmiDumpHelper::DumpAgnostic_CORINFO_RESOLVED_TOKEN(result.resolvedTokenDevirtualizedMethod).c_str() : "???",
Expand All @@ -3330,7 +3330,7 @@ bool MethodContext::repResolveVirtualMethod(CORINFO_DEVIRTUALIZATION_INFO * info

info->devirtualizedMethod = (CORINFO_METHOD_HANDLE) result.devirtualizedMethod;
info->isInstantiatingStub = result.isInstantiatingStub;
info->wasArrayInterfaceDevirt = result.wasArrayInterfaceDevirt;
info->needsMethodContext = result.needsMethodContext;
info->exactContext = (CORINFO_CONTEXT_HANDLE) result.exactContext;
info->detail = (CORINFO_DEVIRTUALIZATION_DETAIL) result.detail;
if (result.returnValue)
Expand Down
6 changes: 3 additions & 3 deletions src/coreclr/vm/jitinterface.cpp
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Expand Up @@ -8567,7 +8567,7 @@ bool CEEInfo::resolveVirtualMethodHelper(CORINFO_DEVIRTUALIZATION_INFO * info)
memset(&info->resolvedTokenDevirtualizedMethod, 0, sizeof(info->resolvedTokenDevirtualizedMethod));
memset(&info->resolvedTokenDevirtualizedUnboxedMethod, 0, sizeof(info->resolvedTokenDevirtualizedUnboxedMethod));
info->isInstantiatingStub = false;
info->wasArrayInterfaceDevirt = false;
info->needsMethodContext = false;

MethodDesc* pBaseMD = GetMethod(info->virtualMethod);
MethodTable* pBaseMT = pBaseMD->GetMethodTable();
Expand Down Expand Up @@ -8811,13 +8811,13 @@ bool CEEInfo::resolveVirtualMethodHelper(CORINFO_DEVIRTUALIZATION_INFO * info)
//
info->isInstantiatingStub = pDevirtMD->IsInstantiatingStub();
info->exactContext = MAKE_METHODCONTEXT((CORINFO_METHOD_HANDLE) pDevirtMD);
info->wasArrayInterfaceDevirt = true;
info->needsMethodContext = true;
}
else
{
info->exactContext = MAKE_CLASSCONTEXT((CORINFO_CLASS_HANDLE) pExactMT);
info->isInstantiatingStub = false;
info->wasArrayInterfaceDevirt = false;
info->needsMethodContext = false;
}

info->devirtualizedMethod = (CORINFO_METHOD_HANDLE) pDevirtMD;
Expand Down
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