Add in the first iteration of support for llvm/clang/lldb to allow variable per address space pointer sizes to be optimized correctly.

llvm-svn: 165726

1 files changed, 7 insertions, 5 deletions

diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index b7bf044a368..146897ad675 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -916,10 +916,11 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, Type *DestTy,
       if (TD && CE->getOpcode() == Instruction::IntToPtr) {
         Constant *Input = CE->getOperand(0);
         unsigned InWidth = Input->getType()->getScalarSizeInBits();
-        if (TD->getPointerSizeInBits() < InWidth) {
+        unsigned AS = cast<PointerType>(CE->getType())->getAddressSpace();
+        if (TD->getPointerSizeInBits(AS) < InWidth) {
           Constant *Mask = 
             ConstantInt::get(CE->getContext(), APInt::getLowBitsSet(InWidth,
-                                                  TD->getPointerSizeInBits()));
+                                                  TD->getPointerSizeInBits(AS)));
           Input = ConstantExpr::getAnd(Input, Mask);
         }
         // Do a zext or trunc to get to the dest size.
@@ -932,9 +933,10 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, Type *DestTy,
     // the int size is >= the ptr size.  This requires knowing the width of a
     // pointer, so it can't be done in ConstantExpr::getCast.
     if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0]))
-      if (TD &&
-          TD->getPointerSizeInBits() <= CE->getType()->getScalarSizeInBits() &&
-          CE->getOpcode() == Instruction::PtrToInt)
+      if (TD && CE->getOpcode() == Instruction::PtrToInt &&
+          TD->getPointerSizeInBits(
+            cast<PointerType>(CE->getOperand(0)->getType())->getAddressSpace())
+          <= CE->getType()->getScalarSizeInBits())
         return FoldBitCast(CE->getOperand(0), DestTy, *TD);
 
     return ConstantExpr::getCast(Opcode, Ops[0], DestTy);