From: Reid Spencer <rspencer@reidspencer.com>
Date: Sat, 12 May 2007 18:01:57 +0000 (+0000)
Subject: Fix shl to produce the correct result when the bitwidth is > 64 and the
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=92c728350011c7d7df29d42166ad3436f1285249;p=oota-llvm.git

Fix shl to produce the correct result when the bitwidth is > 64 and the
shift amount is 0. Previously this code would do a lshr by the bit width
which can lead to incorrect results.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37010 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 4142c6ec8bc..2a35aa057ef 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -1199,6 +1199,12 @@ APInt APInt::shl(uint32_t shiftAmt) const {
   if (shiftAmt == BitWidth)
     return APInt(BitWidth, 0);
 
+  // If none of the bits are shifted out, the result is *this. This avoids a
+  // lshr by the words size in the loop below which can produce incorrect
+  // results. It also avoids the expensive computation below for a common case.
+  if (shiftAmt == 0)
+    return *this;
+
   // Create some space for the result.
   uint64_t * val = new uint64_t[getNumWords()];