Add llc flags to disable machine DCE and CSE.
This is useful for unit tests.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138028 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index d7fc615..a54a08b 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -57,8 +57,12 @@
cl::desc("Disable code placement"));
static cl::opt<bool> DisableSSC("disable-ssc", cl::Hidden,
cl::desc("Disable Stack Slot Coloring"));
+static cl::opt<bool> DisableMachineDCE("disable-machine-dce", cl::Hidden,
+ cl::desc("Disable Machine Dead Code Elimination"));
static cl::opt<bool> DisableMachineLICM("disable-machine-licm", cl::Hidden,
cl::desc("Disable Machine LICM"));
+static cl::opt<bool> DisableMachineCSE("disable-machine-cse", cl::Hidden,
+ cl::desc("Disable Machine Common Subexpression Elimination"));
static cl::opt<bool> DisablePostRAMachineLICM("disable-postra-machine-licm",
cl::Hidden,
cl::desc("Disable Machine LICM"));
@@ -398,12 +402,14 @@
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
- PM.add(createDeadMachineInstructionElimPass());
+ if (!DisableMachineDCE)
+ PM.add(createDeadMachineInstructionElimPass());
printAndVerify(PM, "After codegen DCE pass");
if (!DisableMachineLICM)
PM.add(createMachineLICMPass());
- PM.add(createMachineCSEPass());
+ if (!DisableMachineCSE)
+ PM.add(createMachineCSEPass());
if (!DisableMachineSink)
PM.add(createMachineSinkingPass());
printAndVerify(PM, "After Machine LICM, CSE and Sinking passes");