MIR Serialization: Serialize simple MachineRegisterInfo attributes.

This commit serializes the 3 scalar boolean attributes from the
MachineRegisterInfo class: IsSSA, TracksRegLiveness, and
TracksSubRegLiveness. These attributes are serialized as part
of the machine function YAML mapping.

Reviewers: Duncan P. N. Exon Smith

Differential Revision: http://reviews.llvm.org/D10618


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240579 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MIRParser/MIRParser.cpp

@@ -19,6 +19,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/AsmParser/Parser.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/MIRYamlMapping.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/DiagnosticInfo.h"
@@ -83,6 +84,9 @@ public:
   bool initializeMachineBasicBlock(MachineFunction &MF, MachineBasicBlock &MBB,
                                    const yaml::MachineBasicBlock &YamlMBB);
 
+  bool initializeRegisterInfo(MachineRegisterInfo &RegInfo,
+                              const yaml::MachineFunction &YamlMF);
+
 private:
   /// Return a MIR diagnostic converted from an MI string diagnostic.
   SMDiagnostic diagFromMIStringDiag(const SMDiagnostic &Error,
@@ -212,6 +216,9 @@ bool MIRParserImpl::initializeMachineFunction(MachineFunction &MF) {
     MF.setAlignment(YamlMF.Alignment);
   MF.setExposesReturnsTwice(YamlMF.ExposesReturnsTwice);
   MF.setHasInlineAsm(YamlMF.HasInlineAsm);
+  if (initializeRegisterInfo(MF.getRegInfo(), YamlMF))
+    return true;
+
   const auto &F = *MF.getFunction();
   for (const auto &YamlMBB : YamlMF.BasicBlocks) {
     const BasicBlock *BB = nullptr;
@@ -250,6 +257,18 @@ bool MIRParserImpl::initializeMachineBasicBlock(
   return false;
 }
 
+bool MIRParserImpl::initializeRegisterInfo(
+    MachineRegisterInfo &RegInfo, const yaml::MachineFunction &YamlMF) {
+  assert(RegInfo.isSSA());
+  if (!YamlMF.IsSSA)
+    RegInfo.leaveSSA();
+  assert(RegInfo.tracksLiveness());
+  if (!YamlMF.TracksRegLiveness)
+    RegInfo.invalidateLiveness();
+  RegInfo.enableSubRegLiveness(YamlMF.TracksSubRegLiveness);
+  return false;
+}
+
 SMDiagnostic MIRParserImpl::diagFromMIStringDiag(const SMDiagnostic &Error,
                                                  SMRange SourceRange) {
   assert(SourceRange.isValid() && "Invalid source range");