implement isStoreToStackSlot for PPC

llvm-svn: 25914

1 files changed, 18 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index 322d027504c..66251c0b232 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -95,8 +95,25 @@ unsigned PPCInstrInfo::isLoadFromStackSlot(MachineInstr *MI,
     break;
   }
   return 0;
-                                              }
+}
 
+unsigned PPCInstrInfo::isStoreToStackSlot(MachineInstr *MI, 
+                                          int &FrameIndex) const {
+  switch (MI->getOpcode()) {
+  default: break;
+  //case PPC::ST:  ?
+  case PPC::STW:
+  case PPC::STFS:
+  case PPC::STFD:
+    if (MI->getOperand(1).isImmediate() && !MI->getOperand(1).getImmedValue() &&
+        MI->getOperand(2).isFrameIndex()) {
+      FrameIndex = MI->getOperand(2).getFrameIndex();
+      return MI->getOperand(0).getReg();
+    }
+    break;
+  }
+  return 0;
+}
 
 // commuteInstruction - We can commute rlwimi instructions, but only if the
 // rotate amt is zero.  We also have to munge the immediates a bit.