Use isTrueWhenEqual and isFalseWhenEqual instead of assuming that

[oota-llvm.git] / lib / Analysis / CaptureTracking.cpp

diff --git a/lib/Analysis/CaptureTracking.cpp b/lib/Analysis/CaptureTracking.cpp
index 8364d81497c2f5b9af1190cb0909f388ddedce26..047825884ef357af0d2791fe18722e3a91d0500b 100644 (file)
--- a/lib/Analysis/CaptureTracking.cpp
+++ b/lib/Analysis/CaptureTracking.cpp
@@ -25,6 +25,16 @@
 #include "llvm/Support/CallSite.h"
 using namespace llvm;
 
+/// As its comment mentions, PointerMayBeCaptured can be expensive.
+/// However, it's not easy for BasicAA to cache the result, because
+/// it's an ImmutablePass. To work around this, bound queries at a
+/// fixed number of uses.
+///
+/// TODO: Write a new FunctionPass AliasAnalysis so that it can keep
+/// a cache. Then we can move the code from BasicAliasAnalysis into
+/// that path, and remove this threshold.
+static int const Threshold = 20;
+
 /// PointerMayBeCaptured - Return true if this pointer value may be captured
 /// by the enclosing function (which is required to exist).  This routine can
 /// be expensive, so consider caching the results.  The boolean ReturnCaptures
@@ -34,12 +44,18 @@ using namespace llvm;
 /// counts as capturing it or not.
 bool llvm::PointerMayBeCaptured(const Value *V,
                                 bool ReturnCaptures, bool StoreCaptures) {
-  assert(isa<PointerType>(V->getType()) && "Capture is for pointers only!");
-  SmallVector<Use*, 16> Worklist;
-  SmallSet<Use*, 16> Visited;
+  assert(V->getType()->isPointerTy() && "Capture is for pointers only!");
+  SmallVector<Use*, Threshold> Worklist;
+  SmallSet<Use*, Threshold> Visited;
+  int Count = 0;
 
-  for (Value::use_const_iterator UI = V->use_begin(), UE = V->use_end();
+  for (Value::const_use_iterator UI = V->use_begin(), UE = V->use_end();
        UI != UE; ++UI) {
+    // If there are lots of uses, conservatively say that the value
+    // is captured to avoid taking too much compile time.
+    if (Count++ >= Threshold)
+      return true;
+
     Use *U = &UI.getUse();
     Visited.insert(U);
     Worklist.push_back(U);
@@ -109,7 +125,7 @@ bool llvm::PointerMayBeCaptured(const Value *V,
       // Don't count comparisons of a no-alias return value against null as
       // captures. This allows us to ignore comparisons of malloc results
       // with null, for example.
-      if (isNoAliasCall(V))
+      if (isNoAliasCall(V->stripPointerCasts()))
         if (ConstantPointerNull *CPN =
               dyn_cast<ConstantPointerNull>(I->getOperand(1)))
           if (CPN->getType()->getAddressSpace() == 0)