From: Chris Lattner <sabre@nondot.org>
Date: Mon, 17 Apr 2006 06:07:44 +0000 (+0000)
Subject: Learn how to make odd splatted constants in range [17,29].  This implements
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c408382ecade09f66343b084fa0ab437781de593;p=oota-llvm.git

Learn how to make odd splatted constants in range [17,29].  This implements
PowerPC/vec_constants.ll:test_29.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27752 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index be30d7663b3..53365b17243 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -1105,6 +1105,13 @@ static SDOperand LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
       Op = BuildSplatI(SextVal >> 1, SplatSize, Op.getValueType(), DAG);
       return DAG.getNode(ISD::ADD, Op.getValueType(), Op, Op);
     }
+    // Otherwise, in range [17,29]:  (vsplti 15) + (vsplti C).
+    if (SextVal >= 0 && SextVal <= 29) {
+      SDOperand LHS = BuildSplatI(15, SplatSize, Op.getValueType(), DAG);
+      SDOperand RHS = BuildSplatI(SextVal-15, SplatSize, Op.getValueType(),DAG);
+      return DAG.getNode(ISD::ADD, Op.getValueType(), LHS, RHS);
+      
+    }
 
     
     // If this is 0x8000_0000 x 4, turn into vspltisw + vslw.  If it is