[X86, Peephole] Enable FoldImmediate for X86

Enable FoldImmediate for X86 by implementing X86InstrInfo::FoldImmediate.

Also enhanced peephole by deleting identical instructions after FoldImmediate.

Differential Revision: https://reviews.llvm.org/D151848

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index 1f14546..9e67dcb 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -178,6 +178,12 @@ void MachineFunction::handleRemoval(MachineInstr &MI) {
     TheDelegate->MF_HandleRemoval(MI);
 }
 
+void MachineFunction::handleChangeDesc(MachineInstr &MI,
+                                       const MCInstrDesc &TID) {
+  if (TheDelegate)
+    TheDelegate->MF_HandleChangeDesc(MI, TID);
+}
+
 void MachineFunction::init() {
   // Assume the function starts in SSA form with correct liveness.
   Properties.set(MachineFunctionProperties::Property::IsSSA);