From 726075fdf89ddd8206e9a7504b9a88070b7e6c8c Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 18 Dec 2005 02:27:00 +0000
Subject: [PATCH] Teach the addressing mode stuff to fold "%lo" into 'ri'
 addressing modes, allowing us to compile this:

to this:

%G1 = external global int
%G2 = external global int
void %test() {
        %X = load int* %G1
        store int %X, int* %G2
        ret void
}

test:
        save -96, %sp, %sp
        sethi %hi(G1), %l0
        ld [%l0+%lo(G1)], %l0
        sethi %hi(G2), %l1
        st %l0, [%l1+%lo(G2)]
        restore %g0, %g0, %g0
        retl
        nop

instead of this:

test:
        save -96, %sp, %sp
        sethi %hi(G1), %l0
        or %g0, %lo(G1), %l1
        ld [%l1+%l0], %l0
        sethi %hi(G2), %l1
        or %g0, %lo(G2), %l2
        st %l0, [%l2+%l1]
        restore %g0, %g0, %g0
        retl
        nop

llvm-svn: 24812
---
 llvm/lib/Target/SparcV8/SparcV8AsmPrinter.cpp   |  8 +++++++-
 llvm/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp | 13 +++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/SparcV8/SparcV8AsmPrinter.cpp b/llvm/lib/Target/SparcV8/SparcV8AsmPrinter.cpp
index 592588bdbe22..ea4971c995e6 100644
--- a/llvm/lib/Target/SparcV8/SparcV8AsmPrinter.cpp
+++ b/llvm/lib/Target/SparcV8/SparcV8AsmPrinter.cpp
@@ -186,7 +186,13 @@ void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
 void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
   printOperand(MI, opNum);
   O << "+";
-  printOperand(MI, opNum+1);
+  if (MI->getOperand(opNum+1).getType() == MachineOperand::MO_GlobalAddress) {
+    O << "%lo(";
+    printOperand(MI, opNum+1);
+    O << ")";
+  } else {
+    printOperand(MI, opNum+1);
+  }
 }
 
 
diff --git a/llvm/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp b/llvm/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
index 73b6722c6cc9..aa558d189cbb 100644
--- a/llvm/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
@@ -309,6 +309,9 @@ bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1,
     if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
         Predicate_simm13(Addr.getOperand(1).Val))
       return false;  // Let the reg+imm pattern catch this!
+    if (Addr.getOperand(0).getOpcode() == V8ISD::Lo ||
+        Addr.getOperand(1).getOpcode() == V8ISD::Lo)
+      return false;  // Let the reg+imm pattern catch this!
     R1 = Select(Addr.getOperand(0));
     R2 = Select(Addr.getOperand(1));
     return true;
@@ -328,6 +331,16 @@ bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base,
         Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
         return true;
       }
+    if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) {
+      Base = Select(Addr.getOperand(1));
+      Offset = Addr.getOperand(0).getOperand(0);
+      return true;
+    }
+    if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) {
+      Base = Select(Addr.getOperand(0));
+      Offset = Addr.getOperand(1).getOperand(0);
+      return true;
+    }
   }
   Base = Select(Addr);
   Offset = CurDAG->getTargetConstant(0, MVT::i32);