Reapply r77654 with a fix: MachineFunctionPass's getAnalysisUsage

shouldn't do AU.setPreservesCFG(), because even though CodeGen passes
don't modify the LLVM IR CFG, they may modify the MachineFunction CFG,
and passes like MachineLoop are registered with isCFGOnly set to true.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77691 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 11 deletions

diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 922135571f..d77ce57189 100644
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -20,6 +20,7 @@
 #include "PPCHazardRecognizers.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFunctionAnalysis.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/CodeGen/SelectionDAGISel.h"
@@ -51,17 +52,12 @@ namespace {
         PPCLowering(*TM.getTargetLowering()),
         PPCSubTarget(*TM.getSubtargetImpl()) {}
     
-    virtual bool runOnFunction(Function &Fn) {
-      // Do not codegen any 'available_externally' functions at all, they have
-      // definitions outside the translation unit.
-      if (Fn.hasAvailableExternallyLinkage())
-        return false;
-
+    virtual bool runOnMachineFunction(MachineFunction &MF) {
       // Make sure we re-emit a set of the global base reg if necessary
       GlobalBaseReg = 0;
-      SelectionDAGISel::runOnFunction(Fn);
+      SelectionDAGISel::runOnMachineFunction(MF);
       
-      InsertVRSaveCode(Fn);
+      InsertVRSaveCode(MF);
       return true;
     }
    
@@ -181,7 +177,7 @@ namespace {
     /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
     virtual void InstructionSelect();
     
-    void InsertVRSaveCode(Function &Fn);
+    void InsertVRSaveCode(MachineFunction &MF);
 
     virtual const char *getPassName() const {
       return "PowerPC DAG->DAG Pattern Instruction Selection";
@@ -218,13 +214,12 @@ void PPCDAGToDAGISel::InstructionSelect() {
 /// InsertVRSaveCode - Once the entire function has been instruction selected,
 /// all virtual registers are created and all machine instructions are built,
 /// check to see if we need to save/restore VRSAVE.  If so, do it.
-void PPCDAGToDAGISel::InsertVRSaveCode(Function &F) {
+void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
   // Check to see if this function uses vector registers, which means we have to
   // save and restore the VRSAVE register and update it with the regs we use.  
   //
   // In this case, there will be virtual registers of vector type type created
   // by the scheduler.  Detect them now.
-  MachineFunction &Fn = MachineFunction::get(&F);
   bool HasVectorVReg = false;
   for (unsigned i = TargetRegisterInfo::FirstVirtualRegister, 
        e = RegInfo->getLastVirtReg()+1; i != e; ++i)