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

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/BranchProbabilityInfo.cpp b/llvm/lib/Analysis/BranchProbabilityInfo.cpp
index 11f2bcc4703..c6d17d2936d 100644
--- a/llvm/lib/Analysis/BranchProbabilityInfo.cpp
+++ b/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(