1 files changed, 96 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/CodeMetrics.cpp b/contrib/llvm/lib/Analysis/CodeMetrics.cpp
new file mode 100644
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+++ b/contrib/llvm/lib/Analysis/CodeMetrics.cpp
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+//===- CodeMetrics.cpp - Code cost measurements ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements code cost measurement utilities.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/CodeMetrics.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/Support/CallSite.h"
+
+using namespace llvm;
+
+/// analyzeBasicBlock - Fill in the current structure with information gleaned
+/// from the specified block.
+void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB,
+                                    const TargetTransformInfo &TTI) {
+  ++NumBlocks;
+  unsigned NumInstsBeforeThisBB = NumInsts;
+  for (BasicBlock::const_iterator II = BB->begin(), E = BB->end();
+       II != E; ++II) {
+    // Special handling for calls.
+    if (isa<CallInst>(II) || isa<InvokeInst>(II)) {
+      ImmutableCallSite CS(cast<Instruction>(II));
+
+      if (const Function *F = CS.getCalledFunction()) {
+        // If a function is both internal and has a single use, then it is
+        // extremely likely to get inlined in the future (it was probably
+        // exposed by an interleaved devirtualization pass).
+        if (!CS.isNoInline() && F->hasInternalLinkage() && F->hasOneUse())
+          ++NumInlineCandidates;
+
+        // If this call is to function itself, then the function is recursive.
+        // Inlining it into other functions is a bad idea, because this is
+        // basically just a form of loop peeling, and our metrics aren't useful
+        // for that case.
+        if (F == BB->getParent())
+          isRecursive = true;
+
+        if (TTI.isLoweredToCall(F))
+          ++NumCalls;
+      } else {
+        // We don't want inline asm to count as a call - that would prevent loop
+        // unrolling. The argument setup cost is still real, though.
+        if (!isa<InlineAsm>(CS.getCalledValue()))
+          ++NumCalls;
+      }
+    }
+
+    if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
+      if (!AI->isStaticAlloca())
+        this->usesDynamicAlloca = true;
+    }
+
+    if (isa<ExtractElementInst>(II) || II->getType()->isVectorTy())
+      ++NumVectorInsts;
+
+    if (const CallInst *CI = dyn_cast<CallInst>(II))
+      if (CI->hasFnAttr(Attribute::NoDuplicate))
+        notDuplicatable = true;
+
+    if (const InvokeInst *InvI = dyn_cast<InvokeInst>(II))
+      if (InvI->hasFnAttr(Attribute::NoDuplicate))
+        notDuplicatable = true;
+
+    NumInsts += TTI.getUserCost(&*II);
+  }
+
+  if (isa<ReturnInst>(BB->getTerminator()))
+    ++NumRets;
+
+  // We never want to inline functions that contain an indirectbr.  This is
+  // incorrect because all the blockaddress's (in static global initializers
+  // for example) would be referring to the original function, and this indirect
+  // jump would jump from the inlined copy of the function into the original
+  // function which is extremely undefined behavior.
+  // FIXME: This logic isn't really right; we can safely inline functions
+  // with indirectbr's as long as no other function or global references the
+  // blockaddress of a block within the current function.  And as a QOI issue,
+  // if someone is using a blockaddress without an indirectbr, and that
+  // reference somehow ends up in another function or global, we probably
+  // don't want to inline this function.
+  notDuplicatable |= isa<IndirectBrInst>(BB->getTerminator());
+
+  // Remember NumInsts for this BB.
+  NumBBInsts[BB] = NumInsts - NumInstsBeforeThisBB;
+}