[AArch64][MIR] Serialize AArch64FunctionInfo::HasStreamingModeChanges to MIR

This patch adds serialization of
AArch64FunctionInfo::HasStreamingModeChanges into MIR.

Author: XiaShark

llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp

@@ -40,7 +40,11 @@ yaml::AArch64FunctionInfo::AArch64FunctionInfo(
           getSVEStackSize(MFI, &llvm::AArch64FunctionInfo::getStackSizePPR)),
       HasStackFrame(MFI.hasStackFrame()
                         ? std::optional<bool>(MFI.hasStackFrame())
-                        : std::nullopt) {}
+                        : std::nullopt),
+      HasStreamingModeChanges(
+          MFI.hasStreamingModeChanges()
+              ? std::optional<bool>(MFI.hasStreamingModeChanges())
+              : std::nullopt) {}
 
 void yaml::AArch64FunctionInfo::mappingImpl(yaml::IO &YamlIO) {
   MappingTraits<AArch64FunctionInfo>::mapping(YamlIO, *this);
@@ -55,6 +59,8 @@ void AArch64FunctionInfo::initializeBaseYamlFields(
                     YamlMFI.StackSizePPR.value_or(0));
   if (YamlMFI.HasStackFrame)
     setHasStackFrame(*YamlMFI.HasStackFrame);
+  if (YamlMFI.HasStreamingModeChanges)
+    setHasStreamingModeChanges(*YamlMFI.HasStreamingModeChanges);
 }
 
 static std::pair<bool, bool> GetSignReturnAddress(const Function &F) {

llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h

@@ -645,6 +645,7 @@ struct AArch64FunctionInfo final : public yaml::MachineFunctionInfo {
   std::optional<uint64_t> StackSizeZPR;
   std::optional<uint64_t> StackSizePPR;
   std::optional<bool> HasStackFrame;
+  std::optional<bool> HasStreamingModeChanges;
 
   AArch64FunctionInfo() = default;
   AArch64FunctionInfo(const llvm::AArch64FunctionInfo &MFI);
@@ -659,6 +660,7 @@ template <> struct MappingTraits<AArch64FunctionInfo> {
     YamlIO.mapOptional("stackSizeZPR", MFI.StackSizeZPR);
     YamlIO.mapOptional("stackSizePPR", MFI.StackSizePPR);
     YamlIO.mapOptional("hasStackFrame", MFI.HasStackFrame);
+    YamlIO.mapOptional("hasStreamingModeChanges", MFI.HasStreamingModeChanges);
   }
 };
 

llvm/test/CodeGen/AArch64/aarch64-has-streaming-mode-changes.ll

@@ -0,0 +1,13 @@
+; RUN: llc -mtriple=aarch64 -mattr=+sme -stop-after=aarch64-isel < %s | FileCheck %s
+
+target triple = "aarch64"
+
+declare void @foo() "aarch64_pstate_sm_enabled"
+
+define dso_local void @bar() local_unnamed_addr {
+; CHECK-LABEL: name: bar
+; CHECK: hasStreamingModeChanges: true
+entry:
+  tail call void @foo() "aarch64_pstate_sm_enabled"
+  ret void
+}