Add new pass LazyMachineBlockFrequencyInfo

And use it in MachineOptimizationRemarkEmitter.  A test will follow on top of
Justin's changes to enable MachineORE in AsmPrinter.

The approach is similar to the IR-level pass.  It's a bit simpler because BPI
is immutable at the Machine level so we don't need to make that lazy.

Because of this, a new function mapping is introduced (BPIPassTrait::getBPI).
This function extracts BPI from the pass.  In case of the lazy pass, this is
when the calculation of the BFI occurs.  For Machine-level, this is the
identity function.

Differential Revision: https://reviews.llvm.org/D29836

llvm-svn: 295072

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/MachineOptimizationRemarkEmitter.cpp b/llvm/lib/CodeGen/MachineOptimizationRemarkEmitter.cpp
index 0fc286969eb..b76e75a4bd4 100644
--- a/llvm/lib/CodeGen/MachineOptimizationRemarkEmitter.cpp
+++ b/llvm/lib/CodeGen/MachineOptimizationRemarkEmitter.cpp
@@ -14,7 +14,7 @@
 ///===---------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
-#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
+#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/LLVMContext.h"
@@ -64,7 +64,7 @@ bool MachineOptimizationRemarkEmitterPass::runOnMachineFunction(
   MachineBlockFrequencyInfo *MBFI;
 
   if (MF.getFunction()->getContext().getDiagnosticHotnessRequested())
-    MBFI = &getAnalysis<MachineBlockFrequencyInfo>();
+    MBFI = &getAnalysis<LazyMachineBlockFrequencyInfoPass>().getBFI();
   else
     MBFI = nullptr;
 
@@ -74,7 +74,7 @@ bool MachineOptimizationRemarkEmitterPass::runOnMachineFunction(
 
 void MachineOptimizationRemarkEmitterPass::getAnalysisUsage(
     AnalysisUsage &AU) const {
-  AU.addRequired<MachineBlockFrequencyInfo>();
+  LazyMachineBlockFrequencyInfoPass::getLazyMachineBFIAnalysisUsage(AU);
   AU.setPreservesAll();
   MachineFunctionPass::getAnalysisUsage(AU);
 }
@@ -85,6 +85,6 @@ static const char ore_name[] = "Machine Optimization Remark Emitter";
 
 INITIALIZE_PASS_BEGIN(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name,
                       false, true)
-INITIALIZE_PASS_DEPENDENCY(MachineBlockFrequencyInfo)
+INITIALIZE_PASS_DEPENDENCY(LazyMachineBFIPass)
 INITIALIZE_PASS_END(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name,
                     false, true)