From 18b9b8df86baa9427351e045c356e7ec246eb7a6 Mon Sep 17 00:00:00 2001
From: Jim Laskey <jlaskey@mac.com>
Date: Thu, 18 Aug 2005 18:58:23 +0000
Subject: [PATCH] More optimal solution for loading constants.

llvm-svn: 22870
---
 llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp b/llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
index b217e6015c48..5052c5deca93 100644
--- a/llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
+++ b/llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
@@ -1719,16 +1719,18 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
     assert(N.getValueType() == MVT::i32 &&
            "Only i32 constants are legal on this target!");
     unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
-    unsigned Hi = HA16(v);
-    unsigned Lo = Lo16(v);
-    if (Hi && Lo) {
-      Tmp1 = MakeIntReg();
-      BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(v >> 16);
-      BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
-    } else if (Hi) {
-      BuildMI(BB, PPC::LIS, 1, Result).addSImm(v >> 16);
+    if (isInt16(v)) {
+      BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo16(v));
     } else {
-      BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo);
+      unsigned Hi = Hi16(v);
+      unsigned Lo = Lo16(v);
+      if (Lo) {
+        Tmp1 = MakeIntReg();
+        BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
+        BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
+      } else {
+        BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
+      }
     }
     return Result;
   }