From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Thu, 24 Nov 2011 17:24:33 +0000 (+0000)
Subject: Make ConstantRange::truncate a bit more efficient.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=b3ff49e923225d0f7242ef5ac554bdef34c1b216;p=oota-llvm.git

Make ConstantRange::truncate a bit more efficient.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145122 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp
index c29cb53fb9c..57434795070 100644
--- a/lib/Support/ConstantRange.cpp
+++ b/lib/Support/ConstantRange.cpp
@@ -466,10 +466,8 @@ ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const {
 /// correspond to the possible range of values as if the source range had been
 /// truncated to the specified type.
 ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
-  unsigned SrcTySize = getBitWidth();
-  assert(SrcTySize > DstTySize && "Not a value truncation");
-  APInt Size(APInt::getLowBitsSet(SrcTySize, DstTySize));
-  if (isFullSet() || getSetSize().ugt(Size))
+  assert(getBitWidth() > DstTySize && "Not a value truncation");
+  if (isFullSet() || getSetSize().getActiveBits() > DstTySize)
     return ConstantRange(DstTySize, /*isFullSet=*/true);
 
   return ConstantRange(Lower.trunc(DstTySize), Upper.trunc(DstTySize));