From: Nadav Rotem <nrotem@apple.com>
Date: Wed, 19 Dec 2012 20:47:04 +0000 (+0000)
Subject: Fix a bug that was found by building clang with -fsanitize.
X-Git-Tag: android-x86-6.0-r1~179^2~569
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=521396ab378ba3578cdfdda7422ba8bd79ffee40;p=android-x86%2Fexternal-llvm.git

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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170586 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index 64e132e2e2b..5421cbe6940 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/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);