add cmd line opt to disable frame index reuse for ARM and T2. debug aid.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84664 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index 9ff9ae51a55004e3af4325b0c4209f975cfa2182..f5223760ddea986f7352638ca22c56035591dd37 100644 (file)
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -36,8 +36,13 @@
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
+static cl::opt<bool>
+ReuseFrameIndexVals("arm-reuse-frame-index-vals", cl::Hidden, cl::init(true),
+          cl::desc("Reuse repeated frame index values"));
+
 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum,
                                                    bool *isSPVFP) {
   if (isSPVFP)
@@ -1088,6 +1093,8 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
                              Offset, Pred, PredReg, TII);
     }
     MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
+    if (!ReuseFrameIndexVals)
+      ScratchReg = 0;
   }
   return ScratchReg;
 }