StackColoring: don't clear an instruction's mem operand if the underlying

object is a PseudoSourceValue and PseudoSourceValue::isConstant returns true (i.e.,
points to memory that has a constant value).

llvm-svn: 181751

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/StackColoring.cpp b/llvm/lib/CodeGen/StackColoring.cpp
index a789a2596db..90b93aaa724 100644
--- a/llvm/lib/CodeGen/StackColoring.cpp
+++ b/llvm/lib/CodeGen/StackColoring.cpp
@@ -42,6 +42,7 @@
 #include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
 #include "llvm/CodeGen/SlotIndexes.h"
 #include "llvm/DebugInfo.h"
 #include "llvm/IR/Function.h"
@@ -528,6 +529,10 @@ void StackColoring::remapInstructions(DenseMap<int, int> &SlotRemap) {
         if (!V)
           continue;
 
+        const PseudoSourceValue *PSV = dyn_cast<const PseudoSourceValue>(V);
+        if (PSV && PSV->isConstant(MFI))
+          continue;
+
         // Climb up and find the original alloca.
         V = GetUnderlyingObject(V);
         // If we did not find one, or if the one that we found is not in our