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[clang][RISCV] Enable struct of homogeneous scalable vector as function argument #78550

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40 changes: 37 additions & 3 deletions clang/lib/CodeGen/CGCall.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -3206,6 +3206,25 @@ void CodeGenFunction::EmitFunctionProlog(const CGFunctionInfo &FI,
}
}

llvm::StructType *STy =
dyn_cast<llvm::StructType>(ArgI.getCoerceToType());
llvm::TypeSize StructSize;
llvm::TypeSize PtrElementSize;
if (ArgI.isDirect() && !ArgI.getCanBeFlattened() && STy &&
STy->getNumElements() > 1) {
StructSize = CGM.getDataLayout().getTypeAllocSize(STy);
PtrElementSize =
CGM.getDataLayout().getTypeAllocSize(ConvertTypeForMem(Ty));
if (STy->containsHomogeneousScalableVectorTypes()) {
assert(StructSize == PtrElementSize &&
"Only allow non-fractional movement of structure with"
"homogeneous scalable vector type");

ArgVals.push_back(ParamValue::forDirect(AI));
break;
}
}

Address Alloca = CreateMemTemp(Ty, getContext().getDeclAlign(Arg),
Arg->getName());

Expand All @@ -3214,7 +3233,6 @@ void CodeGenFunction::EmitFunctionProlog(const CGFunctionInfo &FI,

// Fast-isel and the optimizer generally like scalar values better than
// FCAs, so we flatten them if this is safe to do for this argument.
llvm::StructType *STy = dyn_cast<llvm::StructType>(ArgI.getCoerceToType());
if (ArgI.isDirect() && ArgI.getCanBeFlattened() && STy &&
STy->getNumElements() > 1) {
llvm::TypeSize StructSize = CGM.getDataLayout().getTypeAllocSize(STy);
Expand Down Expand Up @@ -5277,6 +5295,24 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
break;
}

llvm::StructType *STy =
dyn_cast<llvm::StructType>(ArgInfo.getCoerceToType());
llvm::Type *SrcTy = ConvertTypeForMem(I->Ty);
llvm::TypeSize SrcTypeSize;
llvm::TypeSize DstTypeSize;
if (STy && ArgInfo.isDirect() && !ArgInfo.getCanBeFlattened()) {
SrcTypeSize = CGM.getDataLayout().getTypeAllocSize(SrcTy);
DstTypeSize = CGM.getDataLayout().getTypeAllocSize(STy);
if (STy->containsHomogeneousScalableVectorTypes()) {
assert(SrcTypeSize == DstTypeSize &&
"Only allow non-fractional movement of structure with "
"homogeneous scalable vector type");

IRCallArgs[FirstIRArg] = I->getKnownRValue().getScalarVal();
break;
}
}

// FIXME: Avoid the conversion through memory if possible.
Address Src = Address::invalid();
if (!I->isAggregate()) {
Expand All @@ -5292,8 +5328,6 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,

// Fast-isel and the optimizer generally like scalar values better than
// FCAs, so we flatten them if this is safe to do for this argument.
llvm::StructType *STy =
dyn_cast<llvm::StructType>(ArgInfo.getCoerceToType());
if (STy && ArgInfo.isDirect() && ArgInfo.getCanBeFlattened()) {
llvm::Type *SrcTy = Src.getElementType();
llvm::TypeSize SrcTypeSize =
Expand Down
8 changes: 7 additions & 1 deletion clang/lib/CodeGen/Targets/RISCV.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -433,7 +433,13 @@ ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
}

return ABIArgInfo::getDirect();
ABIArgInfo Info = ABIArgInfo::getDirect();

// If it is tuple type, it can't be flattened.
if (llvm::StructType *STy = dyn_cast<llvm::StructType>(CGT.ConvertType(Ty)))
Info.setCanBeFlattened(!STy->containsHomogeneousScalableVectorTypes());

return Info;
}

if (const VectorType *VT = Ty->getAs<VectorType>())
Expand Down

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2,491 changes: 730 additions & 1,761 deletions clang/test/CodeGen/RISCV/rvv-intrinsics-autogenerated/non-policy/overloaded/vget.c

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2,491 changes: 730 additions & 1,761 deletions clang/test/CodeGen/RISCV/rvv-intrinsics-autogenerated/non-policy/overloaded/vset.c

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