[PATCH] D17522: Set function entry count as 0 if sample profile is not found for the function.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added reviewers: davidxl, dnovillo, eraman.
danielcdh added a subscriber: llvm-commits.

This change makes the sample profile's behavior consistent with instr profile.

http://reviews.llvm.org/D17522

Files:
  lib/Transforms/IPO/SampleProfile.cpp
  test/Transforms/SampleProfile/entry_counts.ll

Index: test/Transforms/SampleProfile/entry_counts.ll
===================================================================
--- test/Transforms/SampleProfile/entry_counts.ll
+++ test/Transforms/SampleProfile/entry_counts.ll
@@ -8,6 +8,13 @@
   ret void, !dbg !9
 }
 
+; This function does not have profile, check if function_entry_count is 0
+; CHECK: {{.*}} = !{!"function_entry_count", i64 0}
+define void @no_profile() {
+entry:
+  ret void
+}
+
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!6, !7}
 !llvm.ident = !{!8}
Index: lib/Transforms/IPO/SampleProfile.cpp
===================================================================
--- lib/Transforms/IPO/SampleProfile.cpp
+++ lib/Transforms/IPO/SampleProfile.cpp
@@ -1257,6 +1257,7 @@
 }
 
 bool SampleProfileLoader::runOnFunction(Function &F) {
+  F.setEntryCount(0);
   Samples = Reader->getSamplesFor(F);
   if (!Samples->empty())
     return emitAnnotations(F);


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