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, 14 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/BlockFrequencyInfo.cpp b/llvm/lib/Analysis/BlockFrequencyInfo.cpp
index 8175aa07d15..fd41a6a8e20 100644
--- a/llvm/lib/Analysis/BlockFrequencyInfo.cpp
+++ b/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 {