Make naked functions work on PPC.

llvm-svn: 102657

1 files changed, 7 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
index 8048df21b7d..5f1e04eecb4 100644
--- a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -409,6 +409,9 @@ PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
 //
 static bool needsFP(const MachineFunction &MF) {
   const MachineFrameInfo *MFI = MF.getFrameInfo();
+  // Naked functions have no stack frame pushed, so we don't have a frame pointer.
+  if (MF.getFunction()->hasFnAttr(Attribute::Naked))
+    return false;
   return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects() ||
     (GuaranteedTailCallOpt && MF.getInfo<PPCFunctionInfo>()->hasFastCall());
 }
@@ -794,7 +797,10 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
   // If we're not using a Frame Pointer that has been set to the value of the
   // SP before having the stack size subtracted from it, then add the stack size
   // to Offset to get the correct offset.
-  Offset += MFI->getStackSize();
+  // Naked functions have stack size 0, although getStackSize may not reflect that
+  // because we didn't call all the pieces that compute it for naked functions.
+  if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
+    Offset += MFI->getStackSize();
 
   // If we can, encode the offset directly into the instruction.  If this is a
   // normal PPC "ri" instruction, any 16-bit value can be safely encoded.  If