[ValueTracking] Convert most of the calls to computeKnownBits to use the version that returns the KnownBits object.

This continues the changes started when computeSignBit was replaced with this new version of computeKnowBits.

Differential Revision: https://reviews.llvm.org/D33431

llvm-svn: 303773

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 29f67a8f53b..f28ed7c5caf 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -1037,17 +1037,15 @@ unsigned llvm::getOrEnforceKnownAlignment(Value *V, unsigned PrefAlign,
                                           const DominatorTree *DT) {
   assert(V->getType()->isPointerTy() &&
          "getOrEnforceKnownAlignment expects a pointer!");
-  unsigned BitWidth = DL.getPointerTypeSizeInBits(V->getType());
 
-  KnownBits Known(BitWidth);
-  computeKnownBits(V, Known, DL, 0, AC, CxtI, DT);
+  KnownBits Known = computeKnownBits(V, DL, 0, AC, CxtI, DT);
   unsigned TrailZ = Known.countMinTrailingZeros();
 
   // Avoid trouble with ridiculously large TrailZ values, such as
   // those computed from a null pointer.
   TrailZ = std::min(TrailZ, unsigned(sizeof(unsigned) * CHAR_BIT - 1));
 
-  unsigned Align = 1u << std::min(BitWidth - 1, TrailZ);
+  unsigned Align = 1u << std::min(Known.getBitWidth() - 1, TrailZ);
 
   // LLVM doesn't support alignments larger than this currently.
   Align = std::min(Align, +Value::MaximumAlignment);