Print block frequencies in decimal form.

This is easier to read than the internal fixed-point representation.

If anybody knows the correct algorithm for converting fixed-point
numbers to base 10, feel free to fix it.

llvm-svn: 184881

1 files changed, 10 insertions, 1 deletions

diff --git a/llvm/lib/Support/BlockFrequency.cpp b/llvm/lib/Support/BlockFrequency.cpp
index 84a993e3e5b..572dbf57654 100644
--- a/llvm/lib/Support/BlockFrequency.cpp
+++ b/llvm/lib/Support/BlockFrequency.cpp
@@ -117,7 +117,16 @@ BlockFrequency::operator+(const BlockFrequency &Prob) const {
 }
 
 void BlockFrequency::print(raw_ostream &OS) const {
-  OS << Frequency;
+  // Convert fixed-point number to decimal.
+  OS << Frequency / getEntryFrequency() << ".";
+  uint64_t Rem = Frequency % getEntryFrequency();
+  uint64_t Eps = 1;
+  do {
+    Rem *= 10;
+    Eps *= 10;
+    OS << Rem / getEntryFrequency();
+    Rem = Rem % getEntryFrequency();
+  } while (Rem >= Eps/2);
 }
 
 namespace llvm {