Enable DeadMachineInstructionElim when Fast-ISel is enabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56604 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 60925f3..9368540 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -25,6 +25,10 @@
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
+namespace llvm {
+ bool EnableFastISel;
+}
+
static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
cl::desc("Print LLVM IR produced by the loop-reduce pass"));
static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
@@ -49,6 +53,11 @@
cl::desc("Disable scheduling after register allocation"),
cl::init(true));
+static cl::opt<bool, true>
+FastISelOption("fast-isel", cl::Hidden,
+ cl::desc("Enable the experimental \"fast\" instruction selector"),
+ cl::location(EnableFastISel));
+
FileModel::Model
LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
raw_ostream &Out,
@@ -168,6 +177,10 @@
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
+ // If we're using Fast-ISel, clean up the mess.
+ if (EnableFastISel)
+ PM.add(createDeadMachineInstructionElimPass());
+
if (EnableLICM)
PM.add(createMachineLICMPass());