1 files changed, 107 insertions, 0 deletions
diff --git a/contrib/llvm/include/llvm/Analysis/CodeMetrics.h b/contrib/llvm/include/llvm/Analysis/CodeMetrics.h
new file mode 100644
index 0000000..2f59691
--- /dev/null
+++ b/contrib/llvm/include/llvm/Analysis/CodeMetrics.h
@@ -0,0 +1,107 @@
+//===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements various weight measurements for code, helping
+// the Inliner and other passes decide whether to duplicate its contents.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_CODEMETRICS_H
+#define LLVM_ANALYSIS_CODEMETRICS_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/IR/CallSite.h"
+
+namespace llvm {
+class AssumptionCache;
+class BasicBlock;
+class Loop;
+class Function;
+class Instruction;
+class DataLayout;
+class TargetTransformInfo;
+class Value;
+
+/// \brief Check whether a call will lower to something small.
+///
+/// This tests checks whether this callsite will lower to something
+/// significantly cheaper than a traditional call, often a single
+/// instruction. Note that if isInstructionFree(CS.getInstruction()) would
+/// return true, so will this function.
+bool callIsSmall(ImmutableCallSite CS);
+
+/// \brief Utility to calculate the size and a few similar metrics for a set
+/// of basic blocks.
+struct CodeMetrics {
+  /// \brief True if this function contains a call to setjmp or other functions
+  /// with attribute "returns twice" without having the attribute itself.
+  bool exposesReturnsTwice;
+
+  /// \brief True if this function calls itself.
+  bool isRecursive;
+
+  /// \brief True if this function cannot be duplicated.
+  ///
+  /// True if this function contains one or more indirect branches, or it contains
+  /// one or more 'noduplicate' instructions.
+  bool notDuplicatable;
+
+  /// \brief True if this function calls alloca (in the C sense).
+  bool usesDynamicAlloca;
+
+  /// \brief Number of instructions in the analyzed blocks.
+  unsigned NumInsts;
+
+  /// \brief Number of analyzed blocks.
+  unsigned NumBlocks;
+
+  /// \brief Keeps track of basic block code size estimates.
+  DenseMap<const BasicBlock *, unsigned> NumBBInsts;
+
+  /// \brief Keep track of the number of calls to 'big' functions.
+  unsigned NumCalls;
+
+  /// \brief The number of calls to internal functions with a single caller.
+  ///
+  /// These are likely targets for future inlining, likely exposed by
+  /// interleaved devirtualization.
+  unsigned NumInlineCandidates;
+
+  /// \brief How many instructions produce vector values.
+  ///
+  /// The inliner is more aggressive with inlining vector kernels.
+  unsigned NumVectorInsts;
+
+  /// \brief How many 'ret' instructions the blocks contain.
+  unsigned NumRets;
+
+  CodeMetrics()
+      : exposesReturnsTwice(false), isRecursive(false), notDuplicatable(false),
+        usesDynamicAlloca(false), NumInsts(0), NumBlocks(0), NumCalls(0),
+        NumInlineCandidates(0), NumVectorInsts(0), NumRets(0) {}
+
+  /// \brief Add information about a block to the current state.
+  void analyzeBasicBlock(const BasicBlock *BB, const TargetTransformInfo &TTI,
+                         SmallPtrSetImpl<const Value*> &EphValues);
+
+  /// \brief Collect a loop's ephemeral values (those used only by an assume
+  /// or similar intrinsics in the loop).
+  static void collectEphemeralValues(const Loop *L, AssumptionCache *AC,
+                                     SmallPtrSetImpl<const Value *> &EphValues);
+
+  /// \brief Collect a functions's ephemeral values (those used only by an
+  /// assume or similar intrinsics in the function).
+  static void collectEphemeralValues(const Function *L, AssumptionCache *AC,
+                                     SmallPtrSetImpl<const Value *> &EphValues);
+};
+
+}
+
+#endif