Handle loading of 0x????0000 constants with a single instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22858 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCISelPattern.cpp b/lib/Target/PowerPC/PPCISelPattern.cpp
index fb2a93c7187ef0eb73cee1213c42bfe92de640db..2f09a63959332ec04edf081b0a79a2850108cf7c 100644 (file)
--- a/lib/Target/PowerPC/PPCISelPattern.cpp
+++ b/lib/Target/PowerPC/PPCISelPattern.cpp
@@ -1738,12 +1738,16 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
     case MVT::i32:
       {
         int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
-        if (v < 32768 && v >= -32768) {
-          BuildMI(BB, PPC::LI, 1, Result).addSImm(v);
-        } else {
+        unsigned Hi = Hi16(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(v & 0xFFFF);
+          BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
+          BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
+        } else if (Lo) {
+          BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo);
+        } else {
+          BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
         }
       }
     }