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Add function entry count metadata.

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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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237260 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Diego Novillo
2015-05-13 15:13:45 +00:00
parent dcc57103b8
commit a3bccceda7
9 changed files with 146 additions and 0 deletions
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10
lib/IR/MDBuilder.cpp
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@ -53,6 +53,16 @@ MDNode *MDBuilder::createBranchWeights(ArrayRef<uint32_t> Weights) {
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!");