Revert the series of commits starting with r166578 which introduced the

getIntPtrType support for multiple address spaces via a pointer type,
and also introduced a crasher bug in the constant folder reported in
PR14233.

These commits also contained several problems that should really be
addressed before they are re-committed. I have avoided reverting various
cleanups to the DataLayout APIs that are reasonable to have moving
forward in order to reduce the amount of churn, and minimize the number
of commits that were reverted. I've also manually updated merge
conflicts and manually arranged for the getIntPtrType function to stay
in DataLayout and to be defined in a plausible way after this revert.

Thanks to Duncan for working through this exact strategy with me, and
Nick Lewycky for tracking down the really annoying crasher this
triggered. (Test case to follow in its own commit.)

After discussing with Duncan extensively, and based on a note from
Micah, I'm going to continue to back out some more of the more
problematic patches in this series in order to ensure we go into the
LLVM 3.2 branch with a reasonable story here. I'll send a note to
llvmdev explaining what's going on and why.

Summary of reverted revisions:

r166634: Fix a compiler warning with an unused variable.
r166607: Add some cleanup to the DataLayout changes requested by
         Chandler.
r166596: Revert "Back out r166591, not sure why this made it through
         since I cancelled the command. Bleh, sorry about this!
r166591: Delete a directory that wasn't supposed to be checked in yet.
r166578: Add in support for getIntPtrType to get the pointer type based
         on the address space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167221 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 7 deletions

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index a6723c3c7f..5f60bd1674 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -2586,12 +2586,13 @@ const SCEV *ScalarEvolution::getUMinExpr(const SCEV *LHS,
   return getNotSCEV(getUMaxExpr(getNotSCEV(LHS), getNotSCEV(RHS)));
 }
 
-const SCEV *ScalarEvolution::getSizeOfExpr(Type *AllocTy, Type *IntPtrTy) {
+const SCEV *ScalarEvolution::getSizeOfExpr(Type *AllocTy) {
   // If we have DataLayout, we can bypass creating a target-independent
   // constant expression and then folding it back into a ConstantInt.
   // This is just a compile-time optimization.
   if (TD)
-    return getConstant(IntPtrTy, TD->getTypeAllocSize(AllocTy));
+    return getConstant(TD->getIntPtrType(getContext()),
+                       TD->getTypeAllocSize(AllocTy));
 
   Constant *C = ConstantExpr::getSizeOf(AllocTy);
   if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
@@ -2610,13 +2611,13 @@ const SCEV *ScalarEvolution::getAlignOfExpr(Type *AllocTy) {
   return getTruncateOrZeroExtend(getSCEV(C), Ty);
 }
 
-const SCEV *ScalarEvolution::getOffsetOfExpr(StructType *STy, Type *IntPtrTy,
+const SCEV *ScalarEvolution::getOffsetOfExpr(StructType *STy,
                                              unsigned FieldNo) {
   // If we have DataLayout, we can bypass creating a target-independent
   // constant expression and then folding it back into a ConstantInt.
   // This is just a compile-time optimization.
   if (TD)
-    return getConstant(IntPtrTy,
+    return getConstant(TD->getIntPtrType(getContext()),
                        TD->getStructLayout(STy)->getElementOffset(FieldNo));
 
   Constant *C = ConstantExpr::getOffsetOf(STy, FieldNo);
@@ -2703,7 +2704,7 @@ Type *ScalarEvolution::getEffectiveSCEVType(Type *Ty) const {
 
   // The only other support type is pointer.
   assert(Ty->isPointerTy() && "Unexpected non-pointer non-integer type!");
-  if (TD) return TD->getIntPtrType(Ty);
+  if (TD) return TD->getIntPtrType(getContext());
 
   // Without DataLayout, conservatively assume pointers are 64-bit.
   return Type::getInt64Ty(getContext());
@@ -3156,13 +3157,13 @@ const SCEV *ScalarEvolution::createNodeForGEP(GEPOperator *GEP) {
     if (StructType *STy = dyn_cast<StructType>(*GTI++)) {
       // For a struct, add the member offset.
       unsigned FieldNo = cast<ConstantInt>(Index)->getZExtValue();
-      const SCEV *FieldOffset = getOffsetOfExpr(STy, IntPtrTy, FieldNo);
+      const SCEV *FieldOffset = getOffsetOfExpr(STy, FieldNo);
 
       // Add the field offset to the running total offset.
       TotalOffset = getAddExpr(TotalOffset, FieldOffset);
     } else {
       // For an array, add the element offset, explicitly scaled.
-      const SCEV *ElementSize = getSizeOfExpr(*GTI, IntPtrTy);
+      const SCEV *ElementSize = getSizeOfExpr(*GTI);
       const SCEV *IndexS = getSCEV(Index);
       // Getelementptr indices are signed.
       IndexS = getTruncateOrSignExtend(IndexS, IntPtrTy);