[KnownBits] Add bit counting methods to KnownBits struct and use them where possible

This patch adds min/max population count, leading/trailing zero/one bit counting methods.

The min methods return answers based on bits that are known without considering unknown bits. The max methods give answers taking into account the largest count that unknown bits could give.

Differential Revision: https://reviews.llvm.org/D32931

llvm-svn: 302925

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp b/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
index 97dcb40a1d7..9cf66382b58 100644
--- a/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
@@ -346,7 +346,7 @@ bool Vectorizer::isConsecutiveAccess(Value *A, Value *B) {
   if (!Safe) {
     KnownBits Known(BitWidth);
     computeKnownBits(OpA, Known, DL, 0, nullptr, OpA, &DT);
-    if (Known.Zero.countTrailingZeros() < (BitWidth - 1))
+    if (Known.countMaxTrailingOnes() < (BitWidth - 1))
       Safe = true;
   }