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[oota-llvm.git] / lib / Target / Mips / MipsFrameLowering.cpp

diff --git a/lib/Target/Mips/MipsFrameLowering.cpp b/lib/Target/Mips/MipsFrameLowering.cpp
index 6dd251c0547086298acb8f6aed0d85c3e7d4015d..e3cdab427df91f91067ed78b0f98dfc58df42eea 100644 (file)
--- a/lib/Target/Mips/MipsFrameLowering.cpp
+++ b/lib/Target/Mips/MipsFrameLowering.cpp
@@ -12,20 +12,20 @@
 //===----------------------------------------------------------------------===//
 
 #include "MipsFrameLowering.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
 #include "MipsAnalyzeImmediate.h"
 #include "MipsInstrInfo.h"
 #include "MipsMachineFunction.h"
 #include "MipsTargetMachine.h"
-#include "MCTargetDesc/MipsBaseInfo.h"
-#include "llvm/Function.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/DataLayout.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/Function.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetOptions.h"
 
 using namespace llvm;
 
@@ -98,3 +98,37 @@ bool MipsFrameLowering::hasFP(const MachineFunction &MF) const {
   return MF.getTarget().Options.DisableFramePointerElim(MF) ||
       MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken();
 }
+
+uint64_t MipsFrameLowering::estimateStackSize(const MachineFunction &MF) const {
+  const MachineFrameInfo *MFI = MF.getFrameInfo();
+  const TargetRegisterInfo &TRI = *MF.getTarget().getRegisterInfo();
+
+  int64_t Offset = 0;
+
+  // Iterate over fixed sized objects.
+  for (int I = MFI->getObjectIndexBegin(); I != 0; ++I)
+    Offset = std::max(Offset, -MFI->getObjectOffset(I));
+
+  // Conservatively assume all callee-saved registers will be saved.
+  for (const uint16_t *R = TRI.getCalleeSavedRegs(&MF); *R; ++R) {
+    unsigned Size = TRI.getMinimalPhysRegClass(*R)->getSize();
+    Offset = RoundUpToAlignment(Offset + Size, Size);
+  }
+
+  unsigned MaxAlign = MFI->getMaxAlignment();
+
+  // Check that MaxAlign is not zero if there is a stack object that is not a
+  // callee-saved spill.
+  assert(!MFI->getObjectIndexEnd() || MaxAlign);
+
+  // Iterate over other objects.
+  for (unsigned I = 0, E = MFI->getObjectIndexEnd(); I != E; ++I)
+    Offset = RoundUpToAlignment(Offset + MFI->getObjectSize(I), MaxAlign);
+
+  // Call frame.
+  if (MFI->adjustsStack() && hasReservedCallFrame(MF))
+    Offset = RoundUpToAlignment(Offset + MFI->getMaxCallFrameSize(),
+                                std::max(MaxAlign, getStackAlignment()));
+
+  return RoundUpToAlignment(Offset, getStackAlignment());
+}