From: Andrew Lenharth <andrewl@lenharth.org>
Date: Fri, 6 Jan 2006 19:41:51 +0000 (+0000)
Subject: make 0 codegen much better
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=919e666d8ce32ea3dbd069800c4bd6062f09a9f2;p=oota-llvm.git

make 0 codegen much better


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25131 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/Alpha/AlphaISelDAGToDAG.cpp b/lib/Target/Alpha/AlphaISelDAGToDAG.cpp
index f207664f048..8a77c14f13f 100644
--- a/lib/Target/Alpha/AlphaISelDAGToDAG.cpp
+++ b/lib/Target/Alpha/AlphaISelDAGToDAG.cpp
@@ -241,6 +241,10 @@ SDOperand AlphaDAGToDAGISel::Select(SDOperand Op) {
   }
   case ISD::Constant: {
     uint64_t uval = cast<ConstantSDNode>(N)->getValue();
+    
+    if (uval == 0)
+      return CurDAG->getCopyFromReg(CurDAG->getEntryNode(), Alpha::R31, MVT::i64);
+
     int64_t val = (int64_t)uval;
     int32_t val32 = (int32_t)val;
     if (val <= IMM_HIGH + IMM_HIGH * IMM_MULT &&