Add options to dump block frequency/branch probability info in text.

Summary:
Add options -print-bfi/-print-bpi that dump block frequency and branch
probability info like -view-block-freq-propagation-dags and
-view-machine-block-freq-propagation-dags do but in text.

This is useful when the graph is very large and complex (the dot command
crashes, lines/edges too close to tell apart, hard to navigate without textual
search) or simply when text is preferred.

Reviewers: davidxl

Reviewed By: davidxl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D37165

llvm-svn: 311822

Author: hjyamauchi

llvm/lib/Analysis/BlockFrequencyInfo.cpp

@@ -75,6 +75,15 @@ cl::opt<bool>
                            "display to only one function, use filtering option "
                            "-view-bfi-func-name."));
 
+static cl::opt<bool> PrintBlockFreq(
+    "print-bfi", cl::init(false), cl::Hidden,
+    cl::desc("Print the block frequency info."));
+
+cl::opt<std::string> PrintBlockFreqFuncName(
+    "print-bfi-func-name", cl::Hidden,
+    cl::desc("The option to specify the name of the function "
+             "whose block frequency info is printed."));
+
 namespace llvm {
 
 static GVDAGType getGVDT() {
@@ -180,6 +189,11 @@ void BlockFrequencyInfo::calculate(const Function &F,
        F.getName().equals(ViewBlockFreqFuncName))) {
     view();
   }
+  if (PrintBlockFreq &&
+      (PrintBlockFreqFuncName.empty() ||
+       F.getName().equals(PrintBlockFreqFuncName))) {
+    print(dbgs());
+  }
 }
 
 BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {

llvm/lib/Analysis/BranchProbabilityInfo.cpp

@@ -44,6 +44,15 @@ using namespace llvm;
 
 #define DEBUG_TYPE "branch-prob"
 
+static cl::opt<bool> PrintBranchProb(
+    "print-bpi", cl::init(false), cl::Hidden,
+    cl::desc("Print the branch probability info."));
+
+cl::opt<std::string> PrintBranchProbFuncName(
+    "print-bpi-func-name", cl::Hidden,
+    cl::desc("The option to specify the name of the function "
+             "whose branch probability info is printed."));
+
 INITIALIZE_PASS_BEGIN(BranchProbabilityInfoWrapperPass, "branch-prob",
                       "Branch Probability Analysis", false, true)
 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
@@ -790,6 +799,12 @@ void BranchProbabilityInfo::calculate(const Function &F, const LoopInfo &LI,
 
   PostDominatedByUnreachable.clear();
   PostDominatedByColdCall.clear();
+
+  if (PrintBranchProb &&
+      (PrintBranchProbFuncName.empty() ||
+       F.getName().equals(PrintBranchProbFuncName))) {
+    print(dbgs());
+  }
 }
 
 void BranchProbabilityInfoWrapperPass::getAnalysisUsage(

llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp

@@ -68,6 +68,14 @@ extern cl::opt<std::string> ViewBlockFreqFuncName;
 // Defined in Analysis/BlockFrequencyInfo.cpp:  -view-hot-freq-perc=
 extern cl::opt<unsigned> ViewHotFreqPercent;
 
+static cl::opt<bool> PrintMachineBlockFreq(
+    "print-machine-bfi", cl::init(false), cl::Hidden,
+    cl::desc("Print the machine block frequency info."));
+
+// Command line option to specify the name of the function for block frequency
+// dump. Defined in Analysis/BlockFrequencyInfo.cpp.
+extern cl::opt<std::string> PrintBlockFreqFuncName;
+
 static GVDAGType getGVDT() {
   if (ViewBlockLayoutWithBFI != GVDT_None)
     return ViewBlockLayoutWithBFI;
@@ -185,6 +193,11 @@ void MachineBlockFrequencyInfo::calculate(
        F.getName().equals(ViewBlockFreqFuncName))) {
     view("MachineBlockFrequencyDAGS." + F.getName());
   }
+  if (PrintMachineBlockFreq &&
+      (PrintBlockFreqFuncName.empty() ||
+       F.getName().equals(PrintBlockFreqFuncName))) {
+    MBFI->print(dbgs());
+  }
 }
 
 bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {