From 3c7b3fecacee40df7b9a99d290638398b5a62173 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Thu, 24 Jun 2010 20:18:15 +0000
Subject: [PATCH] Remove the now unused LiveIntervals::getVNInfoSourceReg().

This method was always a bit too simplistic for the real world. It didn't really
deal with subregisters and such.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106781 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/LiveIntervalAnalysis.h |  4 ---
 lib/CodeGen/LiveIntervalAnalysis.cpp        | 31 ---------------------
 2 files changed, 35 deletions(-)

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index a07814bf5e6..5a0d81b5c20 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -228,10 +228,6 @@ namespace llvm {
 
     VNInfo::Allocator& getVNInfoAllocator() { return VNInfoAllocator; }
 
-    /// getVNInfoSourceReg - Helper function that parses the specified VNInfo
-    /// copy field and returns the source register that defines it.
-    unsigned getVNInfoSourceReg(const VNInfo *VNI) const;
-
     virtual void getAnalysisUsage(AnalysisUsage &AU) const;
     virtual void releaseMemory();
 
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 949a0cfa56e..7ae66aea6bb 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -783,37 +783,6 @@ LiveInterval* LiveIntervals::dupInterval(LiveInterval *li) {
   return NewLI;
 }
 
-/// getVNInfoSourceReg - Helper function that parses the specified VNInfo
-/// copy field and returns the source register that defines it.
-unsigned LiveIntervals::getVNInfoSourceReg(const VNInfo *VNI) const {
-  if (!VNI->getCopy())
-    return 0;
-
-  if (VNI->getCopy()->isExtractSubreg()) {
-    // If it's extracting out of a physical register, return the sub-register.
-    unsigned Reg = VNI->getCopy()->getOperand(1).getReg();
-    if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
-      unsigned SrcSubReg = VNI->getCopy()->getOperand(2).getImm();
-      unsigned DstSubReg = VNI->getCopy()->getOperand(0).getSubReg();
-      if (SrcSubReg == DstSubReg)
-        // %reg1034:3<def> = EXTRACT_SUBREG %EDX, 3
-        // reg1034 can still be coalesced to EDX.
-        return Reg;
-      assert(DstSubReg == 0);
-      Reg = tri_->getSubReg(Reg, VNI->getCopy()->getOperand(2).getImm());
-    }
-    return Reg;
-  } else if (VNI->getCopy()->isInsertSubreg() ||
-             VNI->getCopy()->isSubregToReg())
-    return VNI->getCopy()->getOperand(2).getReg();
-
-  unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
-  if (tii_->isMoveInstr(*VNI->getCopy(), SrcReg, DstReg, SrcSubReg, DstSubReg))
-    return SrcReg;
-  llvm_unreachable("Unrecognized copy instruction!");
-  return 0;
-}
-
 //===----------------------------------------------------------------------===//
 // Register allocator hooks.
 //