commit d3c76bb6fc3c066286850e91b8bf03484ea2a56e
author Evan Cheng <evan.cheng@apple.com> Thu May 28 23:52:18 2009 +0000
committer Evan Cheng <evan.cheng@apple.com> Thu May 28 23:52:18 2009 +0000
tree ddc9f96ae7a0778351a62a3c122511d14e8d304c
parent 2265ba071762b461ed1e65ebd73f596a98208f60

Do not try to create a MVT type of width 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72557 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/DAGCombiner.cpp

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 3bc9cf0..4c1710d 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4937,6 +4937,8 @@
     APInt Imm = cast<ConstantSDNode>(N1)->getAPIntValue();
     if (Opc == ISD::AND)
       Imm ^= APInt::getAllOnesValue(BitWidth);
+    if (Imm == 0 || Imm.isAllOnesValue())
+      return SDValue();
     unsigned ShAmt = Imm.countTrailingZeros();
     unsigned MSB = BitWidth - Imm.countLeadingZeros() - 1;
     unsigned NewBW = NextPowerOf2(MSB - ShAmt);