Fix a bug that was found by building clang with -fsanitize.

I introduced it in r166785. PR14291.

If TD is unavailable use getScalarSizeInBits, but don't optimize
pointers or vectors of pointers.

llvm-svn: 170586

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 64e132e2e2b..5421cbe6940 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -433,7 +433,12 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,
     unsigned SrcBitWidth;
     // Note that we handle pointer operands here because of inttoptr/ptrtoint
     // which fall through here.
-    SrcBitWidth = TD->getTypeSizeInBits(SrcTy->getScalarType());
+    if(TD) {
+      SrcBitWidth = TD->getTypeSizeInBits(SrcTy->getScalarType());
+    } else {
+      SrcBitWidth = SrcTy->getScalarSizeInBits();
+      if (!SrcBitWidth) return;
+    }
 
     assert(SrcBitWidth && "SrcBitWidth can't be zero");
     KnownZero = KnownZero.zextOrTrunc(SrcBitWidth);