This seems useful from the original patch that added the function. If there is a...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23676 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Alpha/AlphaRegisterInfo.cpp b/lib/Target/Alpha/AlphaRegisterInfo.cpp
index ac7d3f146f824a8d739f6daa2694397b527a8ec5..c348fa9ce46f292118875914c97dc9639c2e36b2 100644 (file)
--- a/lib/Target/Alpha/AlphaRegisterInfo.cpp
+++ b/lib/Target/Alpha/AlphaRegisterInfo.cpp
@@ -107,6 +107,25 @@ AlphaRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
     abort();
 }
 
+unsigned 
+AlphaRegisterInfo::isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const
+{
+  switch (MI->getOpcode()) {
+  case Alpha::LDL:
+  case Alpha::LDQ:
+  case Alpha::LDBU:
+  case Alpha::LDWU:
+  case Alpha::LDS:
+  case Alpha::LDT:
+    if (MI->getOperand(1).isFrameIndex()) {
+      FrameIndex = MI->getOperand(1).getFrameIndex();
+      return MI->getOperand(0).getReg();
+    }
+    break;
+  }
+  return 0;
+}
+
 void AlphaRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
                                      MachineBasicBlock::iterator MI,
                                      unsigned DestReg, unsigned SrcReg,

diff --git a/lib/Target/Alpha/AlphaRegisterInfo.h b/lib/Target/Alpha/AlphaRegisterInfo.h
index 0d8c24a50e757d1365f2b6dc3589f1d9aa09669a..8be85cc7c69d594c261135b462566d7a6bf6a66d 100644 (file)
--- a/lib/Target/Alpha/AlphaRegisterInfo.h
+++ b/lib/Target/Alpha/AlphaRegisterInfo.h
@@ -34,6 +34,8 @@ struct AlphaRegisterInfo : public AlphaGenRegisterInfo {
                             MachineBasicBlock::iterator MBBI,
                             unsigned DestReg, int FrameIndex,
                             const TargetRegisterClass *RC) const;
+  
+  virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
 
   void copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
                     unsigned DestReg, unsigned SrcReg,