Add files I seem to have dropped in my revert (r290086).
Sorry!
llvm-svn: 290087
diff --git a/llvm/lib/Analysis/AssumptionCache.cpp b/llvm/lib/Analysis/AssumptionCache.cpp
new file mode 100644
index 0000000..3c51803
--- /dev/null
+++ b/llvm/lib/Analysis/AssumptionCache.cpp
@@ -0,0 +1,140 @@
+//===- AssumptionCache.cpp - Cache finding @llvm.assume calls -------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a pass that keeps track of @llvm.assume intrinsics in
+// the functions of a module.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/IR/PatternMatch.h"
+#include "llvm/Support/Debug.h"
+using namespace llvm;
+using namespace llvm::PatternMatch;
+
+void AssumptionCache::scanFunction() {
+ assert(!Scanned && "Tried to scan the function twice!");
+ assert(AssumeHandles.empty() && "Already have assumes when scanning!");
+
+ // Go through all instructions in all blocks, add all calls to @llvm.assume
+ // to this cache.
+ for (BasicBlock &B : F)
+ for (Instruction &II : B)
+ if (match(&II, m_Intrinsic<Intrinsic::assume>()))
+ AssumeHandles.push_back(&II);
+
+ // Mark the scan as complete.
+ Scanned = true;
+}
+
+void AssumptionCache::registerAssumption(CallInst *CI) {
+ assert(match(CI, m_Intrinsic<Intrinsic::assume>()) &&
+ "Registered call does not call @llvm.assume");
+
+ // If we haven't scanned the function yet, just drop this assumption. It will
+ // be found when we scan later.
+ if (!Scanned)
+ return;
+
+ AssumeHandles.push_back(CI);
+
+#ifndef NDEBUG
+ assert(CI->getParent() &&
+ "Cannot register @llvm.assume call not in a basic block");
+ assert(&F == CI->getParent()->getParent() &&
+ "Cannot register @llvm.assume call not in this function");
+
+ // We expect the number of assumptions to be small, so in an asserts build
+ // check that we don't accumulate duplicates and that all assumptions point
+ // to the same function.
+ SmallPtrSet<Value *, 16> AssumptionSet;
+ for (auto &VH : AssumeHandles) {
+ if (!VH)
+ continue;
+
+ assert(&F == cast<Instruction>(VH)->getParent()->getParent() &&
+ "Cached assumption not inside this function!");
+ assert(match(cast<CallInst>(VH), m_Intrinsic<Intrinsic::assume>()) &&
+ "Cached something other than a call to @llvm.assume!");
+ assert(AssumptionSet.insert(VH).second &&
+ "Cache contains multiple copies of a call!");
+ }
+#endif
+}
+
+AnalysisKey AssumptionAnalysis::Key;
+
+PreservedAnalyses AssumptionPrinterPass::run(Function &F,
+ FunctionAnalysisManager &AM) {
+ AssumptionCache &AC = AM.getResult<AssumptionAnalysis>(F);
+
+ OS << "Cached assumptions for function: " << F.getName() << "\n";
+ for (auto &VH : AC.assumptions())
+ if (VH)
+ OS << " " << *cast<CallInst>(VH)->getArgOperand(0) << "\n";
+
+ return PreservedAnalyses::all();
+}
+
+void AssumptionCacheTracker::FunctionCallbackVH::deleted() {
+ auto I = ACT->AssumptionCaches.find_as(cast<Function>(getValPtr()));
+ if (I != ACT->AssumptionCaches.end())
+ ACT->AssumptionCaches.erase(I);
+ // 'this' now dangles!
+}
+
+AssumptionCache &AssumptionCacheTracker::getAssumptionCache(Function &F) {
+ // We probe the function map twice to try and avoid creating a value handle
+ // around the function in common cases. This makes insertion a bit slower,
+ // but if we have to insert we're going to scan the whole function so that
+ // shouldn't matter.
+ auto I = AssumptionCaches.find_as(&F);
+ if (I != AssumptionCaches.end())
+ return *I->second;
+
+ // Ok, build a new cache by scanning the function, insert it and the value
+ // handle into our map, and return the newly populated cache.
+ auto IP = AssumptionCaches.insert(std::make_pair(
+ FunctionCallbackVH(&F, this), llvm::make_unique<AssumptionCache>(F)));
+ assert(IP.second && "Scanning function already in the map?");
+ return *IP.first->second;
+}
+
+void AssumptionCacheTracker::verifyAnalysis() const {
+#ifndef NDEBUG
+ SmallPtrSet<const CallInst *, 4> AssumptionSet;
+ for (const auto &I : AssumptionCaches) {
+ for (auto &VH : I.second->assumptions())
+ if (VH)
+ AssumptionSet.insert(cast<CallInst>(VH));
+
+ for (const BasicBlock &B : cast<Function>(*I.first))
+ for (const Instruction &II : B)
+ if (match(&II, m_Intrinsic<Intrinsic::assume>()))
+ assert(AssumptionSet.count(cast<CallInst>(&II)) &&
+ "Assumption in scanned function not in cache");
+ }
+#endif
+}
+
+AssumptionCacheTracker::AssumptionCacheTracker() : ImmutablePass(ID) {
+ initializeAssumptionCacheTrackerPass(*PassRegistry::getPassRegistry());
+}
+
+AssumptionCacheTracker::~AssumptionCacheTracker() {}
+
+INITIALIZE_PASS(AssumptionCacheTracker, "assumption-cache-tracker",
+ "Assumption Cache Tracker", false, true)
+char AssumptionCacheTracker::ID = 0;