1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index 8efe7038daf..155cb3c02b2 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -2609,6 +2609,12 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
   return I;
 }
 
+bool X86FrameLowering::canUseAsPrologue(const MachineBasicBlock &MBB) const {
+  assert(MBB.getParent() && "Block is not attached to a function!");
+  const MachineFunction &MF = *MBB.getParent();
+  return !TRI->needsStackRealignment(MF) || !MBB.isLiveIn(X86::EFLAGS);
+}
+
 bool X86FrameLowering::canUseAsEpilogue(const MachineBasicBlock &MBB) const {
   assert(MBB.getParent() && "Block is not attached to a function!");