r255397 - Attach maximum function count to Module when using PGO mode

[Easwaran Raman via cfe-commits]

Author: eraman
Date: Fri Dec 11 18:31:02 2015
New Revision: 255397

URL: http://llvm.org/viewvc/llvm-project?rev=255397&view=rev
Log:
Attach maximum function count to Module when using PGO mode

This sets the maximum entry count among all functions in the program to the
module using module flags. This allows the optimizer to use this information.

Differential Revision: http://reviews.llvm.org/D15163


Added:
    cfe/trunk/test/CodeGen/pgo-max-function-count.c
Modified:
    cfe/trunk/lib/CodeGen/CodeGenModule.cpp

Modified: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.cpp?rev=255397&r1=255396&r2=255397&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.cpp (original)
+++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp Fri Dec 11 18:31:02 2015
@@ -376,6 +376,9 @@ void CodeGenModule::Release() {
   }
   if (PGOReader && PGOStats.hasDiagnostics())
     PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
+  // In PGO mode, attach maximum function count to the module.
+  if (PGOReader)
+    getModule().setMaximumFunctionCount(PGOReader->getMaximumFunctionCount());
   EmitCtorList(GlobalCtors, "llvm.global_ctors");
   EmitCtorList(GlobalDtors, "llvm.global_dtors");
   EmitGlobalAnnotations();

Added: cfe/trunk/test/CodeGen/pgo-max-function-count.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/pgo-max-function-count.c?rev=255397&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/pgo-max-function-count.c (added)
+++ cfe/trunk/test/CodeGen/pgo-max-function-count.c Fri Dec 11 18:31:02 2015
@@ -0,0 +1,9 @@
+// RUN: %clang -fprofile-generate -o %t -O2 %s
+// RUN: env LLVM_PROFILE_FILE=%t.profraw  %t
+// RUN: llvm-profdata merge -o %t.profdata %t.profraw
+// RUN: %clang -fprofile-use=%t.profdata -o - -S -emit-llvm %s | FileCheck %s
+// Check
+int main() {
+  return 0;
+}
+// CHECK: !{{[0-9]+}} = !{i32 1, !"MaxFunctionCount", i32 1}