Add function entry count metadata.
Summary:
This adds three Function methods to handle function entry counts:
setEntryCount() and getEntryCount().
Entry counts are stored under the MD_prof metadata node with the name
"function_entry_count". They are unsigned 64 bit values set by profilers
(instrumentation and sample profiler changes coming up).
Added documentation for new profile metadata and tests.
Reviewers: dexonsmith, bogner
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D9628
llvm-svn: 237260
diff --git a/llvm/lib/IR/MDBuilder.cpp b/llvm/lib/IR/MDBuilder.cpp
index a901011..354592d 100644
--- a/llvm/lib/IR/MDBuilder.cpp
+++ b/llvm/lib/IR/MDBuilder.cpp
@@ -53,6 +53,16 @@
return MDNode::get(Context, Vals);
}
+MDNode *MDBuilder::createFunctionEntryCount(uint64_t Count) {
+ SmallVector<Metadata *, 2> Vals(2);
+ Vals[0] = createString("function_entry_count");
+
+ Type *Int64Ty = Type::getInt64Ty(Context);
+ Vals[1] = createConstant(ConstantInt::get(Int64Ty, Count));
+
+ return MDNode::get(Context, Vals);
+}
+
MDNode *MDBuilder::createRange(const APInt &Lo, const APInt &Hi) {
assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!");
