[llvm] r269437 - [PGO] Add flags to control IRPGO warnings.

[Rong Xu via llvm-commits]

Author: xur
Date: Fri May 13 12:26:06 2016
New Revision: 269437

URL: http://llvm.org/viewvc/llvm-project?rev=269437&view=rev
Log:
[PGO] Add flags to control IRPGO warnings.
Currently there is no reasonable way to control the warnings in the 'use' phase
of the IRPGO pass. This is problematic because the output can be somewhat
spammy. This patch adds some flags which allow us to optionally disable these
warnings. The current upstream behavior will remain the default.

Patch by Jake VanAdrighem (jvanadrighem at gmail.com)

Differential Revision: http://reviews.llvm.org/D20195

Modified:
    llvm/trunk/lib/Transforms/Instrumentation/PGOInstrumentation.cpp

Modified: llvm/trunk/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/PGOInstrumentation.cpp?rev=269437&r1=269436&r2=269437&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/PGOInstrumentation.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/PGOInstrumentation.cpp Fri May 13 12:26:06 2016
@@ -111,6 +111,16 @@ static cl::opt<unsigned> MaxNumAnnotatio
     cl::desc("Max number of annotations for a single indirect "
              "call callsite"));
 
+// Command line option to enable/disable the warning about missing profile
+// information.
+static cl::opt<bool> NoPGOWarnMissing("no-pgo-warn-missing", cl::init(false),
+                                      cl::Hidden);
+
+// Command line option to enable/disable the warning about a hash mismatch in
+// the profile data.
+static cl::opt<bool> NoPGOWarnMismatch("no-pgo-warn-mismatch", cl::init(false),
+                                       cl::Hidden);
+
 namespace {
 class PGOInstrumentationGenLegacyPass : public ModulePass {
 public:
@@ -575,11 +585,16 @@ bool PGOUseFunc::readCounters(IndexedIns
   ErrorOr<InstrProfRecord> Result =
       PGOReader->getInstrProfRecord(FuncInfo.FuncName, FuncInfo.FunctionHash);
   if (std::error_code EC = Result.getError()) {
-    if (EC == instrprof_error::unknown_function)
+    if (EC == instrprof_error::unknown_function) {
       NumOfPGOMissing++;
-    else if (EC == instrprof_error::hash_mismatch ||
-             EC == llvm::instrprof_error::malformed)
+      if (NoPGOWarnMissing)
+        return false;
+    } else if (EC == instrprof_error::hash_mismatch ||
+               EC == llvm::instrprof_error::malformed) {
       NumOfPGOMismatch++;
+      if (NoPGOWarnMismatch)
+        return false;
+    }
 
     std::string Msg = EC.message() + std::string(" ") + F.getName().str();
     Ctx.diagnose(