Add a new MachineInstr-level DCE pass. It is very simple, and is intended to

be used with fast-isel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56268 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 7 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/LinkAllCodegenComponents.h b/include/llvm/CodeGen/LinkAllCodegenComponents.h
index 9ee22d4926..ac2e9a4b9a 100644
--- a/include/llvm/CodeGen/LinkAllCodegenComponents.h
+++ b/include/llvm/CodeGen/LinkAllCodegenComponents.h
@@ -29,6 +29,8 @@ namespace {
       if (std::getenv("bar") != (char*) -1)
         return;
 
+      (void) llvm::createDeadMachineInstructionElimPass();
+
       (void) llvm::createSimpleRegisterAllocator();
       (void) llvm::createLocalRegisterAllocator();
       (void) llvm::createBigBlockRegisterAllocator();
diff --git a/include/llvm/CodeGen/Passes.h b/include/llvm/CodeGen/Passes.h
index ff1f505902..a7cb578ca6 100644
--- a/include/llvm/CodeGen/Passes.h
+++ b/include/llvm/CodeGen/Passes.h
@@ -75,6 +75,11 @@ namespace llvm {
   /// machine basic blocks.
   extern const PassInfo *const UnreachableMachineBlockElimID;
 
+  /// DeadMachineInstructionElim pass - This pass removes dead machine
+  /// instructions.
+  ///
+  FunctionPass *createDeadMachineInstructionElimPass();
+
   /// Creates a register allocator as the user specified on the command line.
   ///
   FunctionPass *createRegisterAllocator();