[MBFI]: show branch probability in DOT graph
Differential Revision: http://reviews.llvm.org/D21596
llvm-svn: 273430
diff --git a/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp b/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
index 8843136..f83e7ff 100644
--- a/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
+++ b/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
@@ -20,7 +20,9 @@
#include "llvm/InitializePasses.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
@@ -80,6 +82,7 @@
explicit DOTGraphTraits(bool isSimple = false)
: DefaultDOTGraphTraits(isSimple) {}
+ typedef MachineBasicBlock::const_succ_iterator EdgeIter;
static std::string getGraphName(const MachineBlockFrequencyInfo *G) {
return G->getFunction()->getName();
}
@@ -104,6 +107,21 @@
return Result;
}
+ static std::string getEdgeAttributes(const MachineBasicBlock *Node,
+ EdgeIter EI,
+ const MachineBlockFrequencyInfo *MBFI) {
+ MachineBranchProbabilityInfo &MBPI =
+ MBFI->getAnalysis<MachineBranchProbabilityInfo>();
+ BranchProbability BP = MBPI.getEdgeProbability(Node, EI);
+ uint32_t N = BP.getNumerator();
+ uint32_t D = BP.getDenominator();
+ double Percent = 100.0 * N / D;
+ std::string Str;
+ raw_string_ostream OS(Str);
+ OS << format("label=\"%.1f%%\"", Percent);
+ OS.flush();
+ return Str;
+ }
};
} // end namespace llvm