Teach computeKnownBits to look through addrspacecast.

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

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index bfdc349bf04a76cca68768be62f63b471790bfd5..cedf076497e6ef400cf8902ae89bf899b6da6432 100644 (file)
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -29,6 +29,7 @@
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/IR/PatternMatch.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/MathExtras.h"
 #include <cstring>
 using namespace llvm;
@@ -415,6 +416,7 @@ void llvm::computeKnownBits(Value *V, APInt &KnownZero, APInt &KnownOne,
     break; // Can't work with floating point.
   case Instruction::PtrToInt:
   case Instruction::IntToPtr:
+  case Instruction::AddrSpaceCast: // Pointers could be different sizes.
     // We can't handle these if we don't know the pointer size.
     if (!TD) break;
     // FALL THROUGH and handle them the same as zext/trunc.