DataLayout is mandatory, update the API to reflect it with references.

Summary:
Now that the DataLayout is a mandatory part of the module, let's start
cleaning the codebase. This patch is a first attempt at doing that.

This patch is not exactly NFC as for instance some places were passing
a nullptr instead of the DataLayout, possibly just because there was a
default value on the DataLayout argument to many functions in the API.
Even though it is not purely NFC, there is no change in the
validation.

I turned as many pointer to DataLayout to references, this helped
figuring out all the places where a nullptr could come up.

I had initially a local version of this patch broken into over 30
independant, commits but some later commit were cleaning the API and
touching part of the code modified in the previous commits, so it
seemed cleaner without the intermediate state.

Test Plan:

Reviewers: echristo

Subscribers: llvm-commits

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 231740

1 files changed, 10 insertions, 10 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index 2fd53180b75..8c784ab1e68 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -158,10 +158,10 @@ private:
   AssumptionCache *AC;
   TargetLibraryInfo *TLI;
   DominatorTree *DT;
+  const DataLayout &DL;
 
   // Optional analyses. When non-null, these can both be used to do better
   // combining and will be updated to reflect any changes.
-  const DataLayout *DL;
   LoopInfo *LI;
 
   bool MadeIRChange;
@@ -169,7 +169,7 @@ private:
 public:
   InstCombiner(InstCombineWorklist &Worklist, BuilderTy *Builder,
                bool MinimizeSize, AssumptionCache *AC, TargetLibraryInfo *TLI,
-               DominatorTree *DT, const DataLayout *DL, LoopInfo *LI)
+               DominatorTree *DT, const DataLayout &DL, LoopInfo *LI)
       : Worklist(Worklist), Builder(Builder), MinimizeSize(MinimizeSize),
         AC(AC), TLI(TLI), DT(DT), DL(DL), LI(LI), MadeIRChange(false) {}
 
@@ -180,7 +180,7 @@ public:
 
   AssumptionCache *getAssumptionCache() const { return AC; }
 
-  const DataLayout *getDataLayout() const { return DL; }
+  const DataLayout &getDataLayout() const { return DL; }
 
   DominatorTree *getDominatorTree() const { return DT; }
 
@@ -330,17 +330,17 @@ private:
                           Type *Ty);
 
   Instruction *visitCallSite(CallSite CS);
-  Instruction *tryOptimizeCall(CallInst *CI, const DataLayout *DL);
+  Instruction *tryOptimizeCall(CallInst *CI);
   bool transformConstExprCastCall(CallSite CS);
   Instruction *transformCallThroughTrampoline(CallSite CS,
                                               IntrinsicInst *Tramp);
   Instruction *transformZExtICmp(ICmpInst *ICI, Instruction &CI,
                                  bool DoXform = true);
   Instruction *transformSExtICmp(ICmpInst *ICI, Instruction &CI);
-  bool WillNotOverflowSignedAdd(Value *LHS, Value *RHS, Instruction *CxtI);
-  bool WillNotOverflowSignedSub(Value *LHS, Value *RHS, Instruction *CxtI);
-  bool WillNotOverflowUnsignedSub(Value *LHS, Value *RHS, Instruction *CxtI);
-  bool WillNotOverflowSignedMul(Value *LHS, Value *RHS, Instruction *CxtI);
+  bool WillNotOverflowSignedAdd(Value *LHS, Value *RHS, Instruction &CxtI);
+  bool WillNotOverflowSignedSub(Value *LHS, Value *RHS, Instruction &CxtI);
+  bool WillNotOverflowUnsignedSub(Value *LHS, Value *RHS, Instruction &CxtI);
+  bool WillNotOverflowSignedMul(Value *LHS, Value *RHS, Instruction &CxtI);
   Value *EmitGEPOffset(User *GEP);
   Instruction *scalarizePHI(ExtractElementInst &EI, PHINode *PN);
   Value *EvaluateInDifferentElementOrder(Value *V, ArrayRef<int> Mask);
@@ -423,7 +423,7 @@ public:
   }
 
   void computeKnownBits(Value *V, APInt &KnownZero, APInt &KnownOne,
-                        unsigned Depth = 0, Instruction *CxtI = nullptr) const {
+                        unsigned Depth, Instruction *CxtI) const {
     return llvm::computeKnownBits(V, KnownZero, KnownOne, DL, Depth, AC, CxtI,
                                   DT);
   }
@@ -468,7 +468,7 @@ private:
   /// bits.
   Value *SimplifyDemandedUseBits(Value *V, APInt DemandedMask, APInt &KnownZero,
                                  APInt &KnownOne, unsigned Depth,
-                                 Instruction *CxtI = nullptr);
+                                 Instruction *CxtI);
   bool SimplifyDemandedBits(Use &U, APInt DemandedMask, APInt &KnownZero,
                             APInt &KnownOne, unsigned Depth = 0);
   /// Helper routine of SimplifyDemandedUseBits. It tries to simplify demanded