================
@@ -11145,7 +11148,22 @@ bool Sema::areMultiversionVariantFunctionsCompatible(
FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
- if (OldTypeInfo.getCC() != NewTypeInfo.getCC())
+ const auto *OldFPT = OldFD->getType()->getAs<FunctionProtoType>();
+ const auto *NewFPT = NewFD->getType()->getAs<FunctionProtoType>();
+
+ bool ArmStreamingCCMismatched = false;
+ if (OldFPT && NewFPT) {
+ unsigned Diff =
+ OldFPT->getAArch64SMEAttributes() ^
NewFPT->getAArch64SMEAttributes();
+ // Streaming versions cannot be mixed with non-streaming versions.
+ if (Diff & FunctionType::SME_PStateSMEnabledMask)
+ ArmStreamingCCMismatched = true;
+ // Streaming-compatible versions cannot be mixed with anything else.
+ if (Diff & FunctionType::SME_PStateSMCompatibleMask)
+ ArmStreamingCCMismatched = true;
----------------
sdesmalen-arm wrote:
nit:
```suggestion
if (Diff & (FunctionType::SME_PStateSMEnabledMask |
FunctionType::SME_PStateSMCompatibleMask))
ArmStreamingCCMismatched = true;
```
https://github.com/llvm/llvm-project/pull/100181
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