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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
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@ -57,8 +57,12 @@ static cl::opt<bool> DisableCodePlace("disable-code-place", cl::Hidden,
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cl::desc("Disable code placement"));
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static cl::opt<bool> DisableSSC("disable-ssc", cl::Hidden,
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cl::desc("Disable Stack Slot Coloring"));
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static cl::opt<bool> DisableMachineDCE("disable-machine-dce", cl::Hidden,
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cl::desc("Disable Machine Dead Code Elimination"));
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static cl::opt<bool> DisableMachineLICM("disable-machine-licm", cl::Hidden,
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cl::desc("Disable Machine LICM"));
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static cl::opt<bool> DisableMachineCSE("disable-machine-cse", cl::Hidden,
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cl::desc("Disable Machine Common Subexpression Elimination"));
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static cl::opt<bool> DisablePostRAMachineLICM("disable-postra-machine-licm",
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cl::Hidden,
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cl::desc("Disable Machine LICM"));
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@ -398,12 +402,14 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
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// there is one known exception: lowered code for arguments that are only
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// used by tail calls, where the tail calls reuse the incoming stack
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// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
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PM.add(createDeadMachineInstructionElimPass());
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if (!DisableMachineDCE)
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PM.add(createDeadMachineInstructionElimPass());
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printAndVerify(PM, "After codegen DCE pass");
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if (!DisableMachineLICM)
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PM.add(createMachineLICMPass());
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PM.add(createMachineCSEPass());
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if (!DisableMachineCSE)
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PM.add(createMachineCSEPass());
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if (!DisableMachineSink)
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PM.add(createMachineSinkingPass());
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printAndVerify(PM, "After Machine LICM, CSE and Sinking passes");
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