DAGCombine: always constant fold FMA when target disable FP exceptions

[oota-llvm.git] / lib / CodeGen / DwarfEHPrepare.cpp

diff --git a/lib/CodeGen/DwarfEHPrepare.cpp b/lib/CodeGen/DwarfEHPrepare.cpp
index ecfe6f3f46938da411a88a297f91247c8ba38f60..75b74d9a6c33243a79369f73147750e89e7e1bfb 100644 (file)
--- a/lib/CodeGen/DwarfEHPrepare.cpp
+++ b/lib/CodeGen/DwarfEHPrepare.cpp
@@ -12,27 +12,29 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "dwarfehprepare"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/ADT/Statistic.h"
-#include "llvm/Analysis/Dominators.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Module.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/Pass.h"
-#include "llvm/Support/CallSite.h"
 #include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
 #include "llvm/Transforms/Utils/SSAUpdater.h"
 using namespace llvm;
 
+#define DEBUG_TYPE "dwarfehprepare"
+
 STATISTIC(NumResumesLowered, "Number of resume calls lowered");
 
 namespace {
   class DwarfEHPrepare : public FunctionPass {
-    const TargetLoweringBase *TLI;
+    const TargetMachine *TM;
 
     // RewindFunction - _Unwind_Resume or the target equivalent.
     Constant *RewindFunction;
@@ -42,16 +44,21 @@ namespace {
 
   public:
     static char ID; // Pass identification, replacement for typeid.
-    DwarfEHPrepare(const TargetLoweringBase *TLI) :
-      FunctionPass(ID), TLI(TLI), RewindFunction(0) {
-        initializeDominatorTreePass(*PassRegistry::getPassRegistry());
-      }
+    DwarfEHPrepare(const TargetMachine *TM)
+        : FunctionPass(ID), TM(TM), RewindFunction(nullptr) {
+      initializeDominatorTreeWrapperPassPass(*PassRegistry::getPassRegistry());
+    }
+
+    bool runOnFunction(Function &Fn) override;
 
-    virtual bool runOnFunction(Function &Fn);
+    bool doFinalization(Module &M) override {
+      RewindFunction = nullptr;
+      return false;
+    }
 
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const { }
+    void getAnalysisUsage(AnalysisUsage &AU) const override { }
 
-    const char *getPassName() const {
+    const char *getPassName() const override {
       return "Exception handling preparation";
     }
   };
@@ -59,8 +66,8 @@ namespace {
 
 char DwarfEHPrepare::ID = 0;
 
-FunctionPass *llvm::createDwarfEHPass(const TargetLoweringBase *TLI) {
-  return new DwarfEHPrepare(TLI);
+FunctionPass *llvm::createDwarfEHPass(const TargetMachine *TM) {
+  return new DwarfEHPrepare(TM);
 }
 
 /// GetExceptionObject - Return the exception object from the value passed into
@@ -68,10 +75,10 @@ FunctionPass *llvm::createDwarfEHPass(const TargetLoweringBase *TLI) {
 /// instructions, including the 'resume' instruction.
 Value *DwarfEHPrepare::GetExceptionObject(ResumeInst *RI) {
   Value *V = RI->getOperand(0);
-  Value *ExnObj = 0;
+  Value *ExnObj = nullptr;
   InsertValueInst *SelIVI = dyn_cast<InsertValueInst>(V);
-  LoadInst *SelLoad = 0;
-  InsertValueInst *ExcIVI = 0;
+  LoadInst *SelLoad = nullptr;
+  InsertValueInst *ExcIVI = nullptr;
   bool EraseIVIs = false;
 
   if (SelIVI) {
@@ -106,20 +113,18 @@ Value *DwarfEHPrepare::GetExceptionObject(ResumeInst *RI) {
 /// InsertUnwindResumeCalls - Convert the ResumeInsts that are still present
 /// into calls to the appropriate _Unwind_Resume function.
 bool DwarfEHPrepare::InsertUnwindResumeCalls(Function &Fn) {
-  bool UsesNewEH = false;
   SmallVector<ResumeInst*, 16> Resumes;
   for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
     TerminatorInst *TI = I->getTerminator();
     if (ResumeInst *RI = dyn_cast<ResumeInst>(TI))
       Resumes.push_back(RI);
-    else if (InvokeInst *II = dyn_cast<InvokeInst>(TI))
-      UsesNewEH = II->getUnwindDest()->isLandingPad();
   }
 
   if (Resumes.empty())
-    return UsesNewEH;
+    return false;
 
   // Find the rewind function if we didn't already.
+  const TargetLowering *TLI = TM->getSubtargetImpl()->getTargetLowering();
   if (!RewindFunction) {
     LLVMContext &Ctx = Resumes[0]->getContext();
     FunctionType *FTy = FunctionType::get(Type::getVoidTy(Ctx),