Revert "[FastISel][X86] Remove no longer needed functions."

[oota-llvm.git] / lib / Target / X86 / X86FrameLowering.cpp

diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp
index 1544549e5e9995d52550ee20d76cbcb10e80d547..8c029a8c22d5f864233272d1687505a7ab4b5f2f 100644 (file)
--- a/lib/Target/X86/X86FrameLowering.cpp
+++ b/lib/Target/X86/X86FrameLowering.cpp
@@ -751,10 +751,13 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
       SEHFrameOffset += SEHFrameOffset % 16; // ensure alignmant
 
       // This only needs to account for XMM spill slots, GPR slots
-      // are covered by .seh_pushreg's emitted above.
-      BuildMI(MBB, MBBI, DL, TII.get(X86::SEH_StackAlloc))
-          .addImm(SEHFrameOffset - X86FI->getCalleeSavedFrameSize())
-          .setMIFlag(MachineInstr::FrameSetup);
+      // are covered by the .seh_pushreg's emitted above.
+      unsigned Size = SEHFrameOffset - X86FI->getCalleeSavedFrameSize();
+      if (Size) {
+        BuildMI(MBB, MBBI, DL, TII.get(X86::SEH_StackAlloc))
+            .addImm(Size)
+            .setMIFlag(MachineInstr::FrameSetup);
+      }
 
       BuildMI(MBB, MBBI, DL, TII.get(X86::SEH_SetFrame))
           .addImm(FramePtr)