Simplify eliminateFrameIndex() interface back down now that PEI doesn't need

to try to re-use scavenged frame index reference registers. rdar://8277890

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112241 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 3 insertions, 19 deletions

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 66138f6782..e2802c1fdf 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -63,7 +63,6 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
   const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
   RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
   FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
-  FrameConstantRegMap.clear();
 
   // Calculate the MaxCallFrameSize and AdjustsStack variables for the
   // function's frame information. Also eliminates call frame pseudo
@@ -756,16 +755,8 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
           // If this instruction has a FrameIndex operand, we need to
           // use that target machine register info object to eliminate
           // it.
-          TargetRegisterInfo::FrameIndexValue Value;
-          unsigned VReg =
-            TRI.eliminateFrameIndex(MI, SPAdj, &Value,
+            TRI.eliminateFrameIndex(MI, SPAdj,
                                     FrameIndexVirtualScavenging ?  NULL : RS);
-          if (VReg) {
-            assert (FrameIndexVirtualScavenging &&
-                    "Not scavenging, but virtual returned from "
-                    "eliminateFrameIndex()!");
-            FrameConstantRegMap[VReg] = FrameConstantEntry(Value, SPAdj);
-          }
 
           // Reset the iterator if we were at the beginning of the BB.
           if (AtBeginning) {
diff --git a/lib/CodeGen/PrologEpilogInserter.h b/lib/CodeGen/PrologEpilogInserter.h
index e56c36fe90..d575124a6b 100644
--- a/lib/CodeGen/PrologEpilogInserter.h
+++ b/lib/CodeGen/PrologEpilogInserter.h
@@ -99,13 +99,6 @@ namespace llvm {
     // TRI->requiresFrameIndexScavenging() for the curren function.
     bool FrameIndexVirtualScavenging;
 
-    // When using the scavenger post-pass to resolve frame reference
-    // materialization registers, maintain a map of the registers to
-    // the constant value and SP adjustment associated with it.
-    typedef std::pair<TargetRegisterInfo::FrameIndexValue, int>
-      FrameConstantEntry;
-    DenseMap<unsigned, FrameConstantEntry> FrameConstantRegMap;
-
 #ifndef NDEBUG
     // Machine function handle.
     MachineFunction* MF;
diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index 43b3fb6426..18de35bcbb 100644
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -366,12 +366,12 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
            "Cannot scavenge register without an emergency spill slot!");
     TII->storeRegToStackSlot(*MBB, I, SReg, true, ScavengingFrameIndex, RC,TRI);
     MachineBasicBlock::iterator II = prior(I);
-    TRI->eliminateFrameIndex(II, SPAdj, NULL, this);
+    TRI->eliminateFrameIndex(II, SPAdj, this);
 
     // Restore the scavenged register before its use (or first terminator).
     TII->loadRegFromStackSlot(*MBB, UseMI, SReg, ScavengingFrameIndex, RC, TRI);
     II = prior(UseMI);
-    TRI->eliminateFrameIndex(II, SPAdj, NULL, this);
+    TRI->eliminateFrameIndex(II, SPAdj, this);
   }
 
   ScavengeRestore = prior(UseMI);