Reapply "Rename InlineFeatureAnalysis to FunctionPropertiesAnalysis"

(This reverts commit a5e0194709c40212694370e0ea789a1ca14548b5, and
corrects author).

Rename the pass to be able to extend it to function properties other than inliner features.

    Reviewed By: mtrofin

    Differential Revision: https://reviews.llvm.org/D82044

1 files changed, 42 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/FunctionPropertiesAnalysis.cpp b/llvm/lib/Analysis/FunctionPropertiesAnalysis.cpp
new file mode 100644
index 0000000..a0fc017
--- /dev/null
+++ b/llvm/lib/Analysis/FunctionPropertiesAnalysis.cpp
@@ -0,0 +1,42 @@
+//===- FunctionPropertiesAnalysis.cpp - Function properties extraction ----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements an analysis extracting function features, which may be
+// used by ML-driven policies, for example.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/FunctionPropertiesAnalysis.h"
+#include "llvm/IR/Instructions.h"
+
+using namespace llvm;
+
+AnalysisKey FunctionPropertiesAnalysis::Key;
+
+FunctionPropertiesAnalysis::Result
+FunctionPropertiesAnalysis::run(const Function &F,
+                                FunctionAnalysisManager &FAM) {
+  Result Ret;
+  Ret.Uses = ((!F.hasLocalLinkage()) ? 1 : 0) + F.getNumUses();
+  for (const auto &BB : F) {
+    ++Ret.BasicBlockCount;
+    if (const auto *BI = dyn_cast<BranchInst>(BB.getTerminator())) {
+      if (BI->isConditional())
+        Ret.BlocksReachedFromConditionalInstruction += BI->getNumSuccessors();
+    } else if (const auto *SI = dyn_cast<SwitchInst>(BB.getTerminator()))
+      Ret.BlocksReachedFromConditionalInstruction +=
+          (SI->getNumCases() + (nullptr != SI->getDefaultDest()));
+    for (const auto &I : BB)
+      if (auto *CS = dyn_cast<CallBase>(&I)) {
+        const auto *Callee = CS->getCalledFunction();
+        if (Callee && !Callee->isIntrinsic() && !Callee->isDeclaration())
+          ++Ret.DirectCallsToDefinedFunctions;
+      }
+  }
+  return Ret;
+}
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