SLSR: Use UnknownAddressSpace instead of 0 for pure arithmetic.

In the case where isLegalAddressingMode is used for cases
not related to addressing modes, such as pure adds and muls,
it should not be using address space 0. LSR already passes -1
as the address space in these cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267645 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp b/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
index 03de393..c9761b7 100644 (file)
--- a/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
@@ -74,6 +74,8 @@ using namespace PatternMatch;
 
 namespace {
 
+static const unsigned UnknownAddressSpace = ~0u;
+
 class StraightLineStrengthReduce : public FunctionPass {
 public:
   // SLSR candidate. Such a candidate must be in one of the forms described in
@@ -276,7 +278,7 @@ static bool isGEPFoldable(GetElementPtrInst *GEP,
 static bool isAddFoldable(const SCEV *Base, ConstantInt *Index, Value *Stride,
                           TargetTransformInfo *TTI) {
   return TTI->isLegalAddressingMode(Base->getType(), nullptr, 0, true,
-                                    Index->getSExtValue());
+                                    Index->getSExtValue(), UnknownAddressSpace);
 }
 
 bool StraightLineStrengthReduce::isFoldable(const Candidate &C,