AMDGPU: Support commuting a FrameIndex operand

llvm-svn: 281369

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index cc33b1efdbf..e2bbe3cb870 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -175,6 +175,16 @@ void MachineOperand::ChangeToMCSymbol(MCSymbol *Sym) {
   Contents.Sym = Sym;
 }
 
+void MachineOperand::ChangeToFrameIndex(int Idx) {
+  assert((!isReg() || !isTied()) &&
+         "Cannot change a tied operand into a FrameIndex");
+
+  removeRegFromUses();
+
+  OpKind = MO_FrameIndex;
+  setIndex(Idx);
+}
+
 /// ChangeToRegister - Replace this operand with a new register operand of
 /// the specified value.  If an operand is known to be an register already,
 /// the setReg method should be used.