================
@@ -814,6 +821,93 @@ Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF,
Address VAListAddr,
/*allowHigherAlign*/ false);
}
+class SMEAttributes {
+public:
+ bool IsStreaming = false;
+ bool IsStreamingBody = false;
+ bool IsStreamingCompatible = false;
+ bool HasNewZA = false;
+
+ SMEAttributes(const FunctionDecl *F) {
+ if (F->hasAttr<ArmLocallyStreamingAttr>())
+ IsStreamingBody = true;
+ if (auto *NewAttr = F->getAttr<ArmNewAttr>()) {
+ if (NewAttr->isNewZA())
+ HasNewZA = true;
+ }
+ if (const auto *T = F->getType()->getAs<FunctionProtoType>()) {
+ if (T->getAArch64SMEAttributes() & FunctionType::SME_PStateSMEnabledMask)
+ IsStreaming = true;
+ if (T->getAArch64SMEAttributes() &
+ FunctionType::SME_PStateSMCompatibleMask)
+ IsStreamingCompatible = true;
+ }
+ }
+
+ bool hasStreamingBody() const { return IsStreamingBody; }
+ bool hasStreamingInterface() const { return IsStreaming; }
+ bool hasStreamingCompatibleInterface() const { return IsStreamingCompatible;
}
+ bool hasStreamingInterfaceOrBody() const {
+ return hasStreamingBody() || hasStreamingInterface();
+ }
+ bool hasNonStreamingInterface() const {
+ return !hasStreamingInterface() && !hasStreamingCompatibleInterface();
+ }
+ bool hasNonStreamingInterfaceAndBody() const {
+ return hasNonStreamingInterface() && !hasStreamingBody();
+ }
+
+ bool requiresSMChange(const SMEAttributes Callee,
+ bool BodyOverridesInterface = false) {
+ // If the transition is not through a call (e.g. when considering inlining)
+ // and Callee has a streaming body, then we can ignore the interface of
+ // Callee.
+ if (BodyOverridesInterface && Callee.hasStreamingBody()) {
+ return !hasStreamingInterfaceOrBody();
+ }
+
+ if (Callee.hasStreamingCompatibleInterface())
+ return false;
+
+ if (hasStreamingCompatibleInterface())
+ return true;
+
+ // Both non-streaming
+ if (hasNonStreamingInterfaceAndBody() && Callee.hasNonStreamingInterface())
+ return false;
+
+ // Both streaming
+ if (hasStreamingInterfaceOrBody() && Callee.hasStreamingInterface())
+ return false;
+
+ return Callee.hasStreamingInterface();
+ }
+
+ bool hasNewZABody() { return HasNewZA; }
+ bool requiresLazySave() const { return HasNewZA; }
----------------
SamTebbs33 wrote:
Thanks, I've now removed the lazy save checking to loosen that restriction.
https://github.com/llvm/llvm-project/pull/77936
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