From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Sat, 24 Oct 2015 11:38:01 +0000 (+0000)
Subject: [BasicAliasAnalysis] Simplify expression, no functional change.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d2c7e761d2699f8bd564744dee47ee3b8904bda7;p=llvm

[BasicAliasAnalysis] Simplify expression, no functional change.

(-1) - x + 1 is the same as -x.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251185 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 59b2953c3b9..bdefc1f3716 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -1538,11 +1538,10 @@ bool BasicAAResult::constantOffsetHeuristic(
 
   // If we've been sext'ed then zext'd the maximum difference between Var0 and
   // Var1 is possible to calculate, but we're just interested in the absolute
-  // minumum difference between the two. The minimum distance may occur due to
+  // minimum difference between the two. The minimum distance may occur due to
   // wrapping; consider "add i3 %i, 5": if %i == 7 then 7 + 5 mod 8 == 4, and so
   // the minimum distance between %i and %i + 5 is 3.
-  APInt MinDiff = V0Offset - V1Offset,
-        Wrapped = APInt::getMaxValue(Width) - MinDiff + APInt(Width, 1);
+  APInt MinDiff = V0Offset - V1Offset, Wrapped = -MinDiff;
   MinDiff = APIntOps::umin(MinDiff, Wrapped);
   uint64_t MinDiffBytes = MinDiff.getZExtValue() * std::abs(Var0.Scale);