[X86] Add start/end debug messages for the X86CompressEVEXPass and X86PadShortFunctionPass (llvm#144056)

Author: RKSimon

llvm/lib/Target/X86/X86CompressEVEX.cpp

@@ -300,6 +300,7 @@ static bool CompressEVEXImpl(MachineInstr &MI, const X86Subtarget &ST) {
 }
 
 bool CompressEVEXPass::runOnMachineFunction(MachineFunction &MF) {
+  LLVM_DEBUG(dbgs() << "Start X86CompressEVEXPass\n";);
 #ifndef NDEBUG
   // Make sure the tables are sorted.
   static std::atomic<bool> TableChecked(false);
@@ -320,7 +321,7 @@ bool CompressEVEXPass::runOnMachineFunction(MachineFunction &MF) {
     for (MachineInstr &MI : MBB)
       Changed |= CompressEVEXImpl(MI, ST);
   }
-
+  LLVM_DEBUG(dbgs() << "End X86CompressEVEXPass\n";);
   return Changed;
 }
 

llvm/lib/Target/X86/X86PadShortFunction.cpp

@@ -100,6 +100,7 @@ FunctionPass *llvm::createX86PadShortFunctions() {
 /// runOnMachineFunction - Loop over all of the basic blocks, inserting
 /// NOOP instructions before early exits.
 bool PadShortFunc::runOnMachineFunction(MachineFunction &MF) {
+  LLVM_DEBUG(dbgs() << "Start X86PadShortFunctionPass\n";);
   if (skipFunction(MF.getFunction()))
     return false;
 
@@ -149,7 +150,7 @@ bool PadShortFunc::runOnMachineFunction(MachineFunction &MF) {
       MadeChange = true;
     }
   }
-
+  LLVM_DEBUG(dbgs() << "End X86PadShortFunctionPass\n";);
   return MadeChange;
 }