[llvm] r267645 - SLSR: Use UnknownAddressSpace instead of 0 for pure arithmetic.

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Tue Apr 26 19:32:09 2016
New Revision: 267645

URL: http://llvm.org/viewvc/llvm-project?rev=267645&view=rev
Log:
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.

Modified:
    llvm/trunk/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp?rev=267645&r1=267644&r2=267645&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp Tue Apr 26 19:32:09 2016
@@ -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(GetElementPtrI
 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,