[PGO] Do not attach VP metadata if value count at site is 0 [NFC]

llvm-svn: 266335
2016-04-14 16:25:45 +00:00 · 2016-04-14 16:25:45 +00:00 · 4f1e8c94bf
parent b77365b595
commit 4f1e8c94bf
1 changed files with 2 additions and 0 deletions
--- a/llvm/lib/ProfileData/InstrProf.cpp
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@ -636,6 +636,8 @@ void annotateValueSite(Module &M, Instruction &Inst,
                       InstrProfValueKind ValueKind, uint32_t SiteIdx,
                       uint32_t MaxMDCount) {
  uint32_t NV = InstrProfR.getNumValueDataForSite(ValueKind, SiteIdx);
+  if (!NV)
+    return;

  uint64_t Sum = 0;
  std::unique_ptr<InstrProfValueData[]> VD =