Make DataLayout Non-Optional in the Module

Summary:
DataLayout keeps the string used for its creation.

As a side effect it is no longer needed in the Module.
This is "almost" NFC, the string is no longer
canonicalized, you can't rely on two "equals" DataLayout
having the same string returned by getStringRepresentation().

Get rid of DataLayoutPass: the DataLayout is in the Module

The DataLayout is "per-module", let's enforce this by not
duplicating it more than necessary.
One more step toward non-optionality of the DataLayout in the
module.

Make DataLayout Non-Optional in the Module

Module->getDataLayout() will never returns nullptr anymore.

Reviewers: echristo

Subscribers: resistor, llvm-commits, jholewinski

Differential Revision: http://reviews.llvm.org/D7992

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 231270

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/lib/Analysis/Loads.cpp b/llvm/lib/Analysis/Loads.cpp
index aaaf75f3015..315a42ef376 100644
--- a/llvm/lib/Analysis/Loads.cpp
+++ b/llvm/lib/Analysis/Loads.cpp
@@ -179,11 +179,10 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
 
   // Try to get the DataLayout for this module. This may be null, in which case
   // the optimizations will be limited.
-  const DataLayout *DL = ScanBB->getModule()->getDataLayout();
+  const DataLayout &DL = ScanBB->getModule()->getDataLayout();
 
   // Try to get the store size for the type.
-  uint64_t AccessSize = DL ? DL->getTypeStoreSize(AccessTy)
-                           : AA ? AA->getTypeStoreSize(AccessTy) : 0;
+  uint64_t AccessSize = DL.getTypeStoreSize(AccessTy);
 
   Value *StrippedPtr = Ptr->stripPointerCasts();
 
@@ -208,7 +207,7 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
     if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
       if (AreEquivalentAddressValues(
               LI->getPointerOperand()->stripPointerCasts(), StrippedPtr) &&
-          CastInst::isBitOrNoopPointerCastable(LI->getType(), AccessTy, DL)) {
+          CastInst::isBitOrNoopPointerCastable(LI->getType(), AccessTy, &DL)) {
         if (AATags)
           LI->getAAMetadata(*AATags);
         return LI;
@@ -221,7 +220,7 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
       // those cases are unlikely.)
       if (AreEquivalentAddressValues(StorePtr, StrippedPtr) &&
           CastInst::isBitOrNoopPointerCastable(SI->getValueOperand()->getType(),
-                                               AccessTy, DL)) {
+                                               AccessTy, &DL)) {
         if (AATags)
           SI->getAAMetadata(*AATags);
         return SI->getOperand(0);