1 files changed, 32 insertions, 20 deletions

diff --git a/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp b/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp
index a0dae6e..7874240 100644
--- a/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp
+++ b/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp
@@ -37,18 +37,27 @@ void SparcFrameLowering::emitPrologue(MachineFunction &MF) const {
   // Get the number of bytes to allocate from the FrameInfo
   int NumBytes = (int) MFI->getStackSize();
 
-  // Emit the correct save instruction based on the number of bytes in
-  // the frame. Minimum stack frame size according to V8 ABI is:
-  //   16 words for register window spill
-  //    1 word for address of returned aggregate-value
-  // +  6 words for passing parameters on the stack
-  // ----------
-  //   23 words * 4 bytes per word = 92 bytes
-  NumBytes += 92;
+  if (SubTarget.is64Bit()) {
+    // All 64-bit stack frames must be 16-byte aligned, and must reserve space
+    // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
+    NumBytes += 128;
+    // Frames with calls must also reserve space for 6 outgoing arguments
+    // whether they are used or not. LowerCall_64 takes care of that.
+    assert(NumBytes % 16 == 0 && "Stack size not 16-byte aligned");
+  } else {
+    // Emit the correct save instruction based on the number of bytes in
+    // the frame. Minimum stack frame size according to V8 ABI is:
+    //   16 words for register window spill
+    //    1 word for address of returned aggregate-value
+    // +  6 words for passing parameters on the stack
+    // ----------
+    //   23 words * 4 bytes per word = 92 bytes
+    NumBytes += 92;
 
-  // Round up to next doubleword boundary -- a double-word boundary
-  // is required by the ABI.
-  NumBytes = (NumBytes + 7) & ~7;
+    // Round up to next doubleword boundary -- a double-word boundary
+    // is required by the ABI.
+    NumBytes = RoundUpToAlignment(NumBytes, 8);
+  }
   NumBytes = -NumBytes;
 
   if (NumBytes >= -4096) {
@@ -70,15 +79,18 @@ void SparcFrameLowering::emitPrologue(MachineFunction &MF) const {
 void SparcFrameLowering::
 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I) const {
-  MachineInstr &MI = *I;
-  DebugLoc dl = MI.getDebugLoc();
-  int Size = MI.getOperand(0).getImm();
-  if (MI.getOpcode() == SP::ADJCALLSTACKDOWN)
-    Size = -Size;
-  const SparcInstrInfo &TII =
-    *static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
-  if (Size)
-    BuildMI(MBB, I, dl, TII.get(SP::ADDri), SP::O6).addReg(SP::O6).addImm(Size);
+  if (!hasReservedCallFrame(MF)) {
+    MachineInstr &MI = *I;
+    DebugLoc DL = MI.getDebugLoc();
+    int Size = MI.getOperand(0).getImm();
+    if (MI.getOpcode() == SP::ADJCALLSTACKDOWN)
+      Size = -Size;
+    const SparcInstrInfo &TII =
+      *static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
+    if (Size)
+      BuildMI(MBB, I, DL, TII.get(SP::ADDri), SP::O6).addReg(SP::O6)
+        .addImm(Size);
+  }
   MBB.erase(I);
 }