From aa1f876954b400e7b8055b7f54ecc22160e60110 Mon Sep 17 00:00:00 2001
From: David Goodwin <david_goodwin@apple.com>
Date: Tue, 30 Jun 2009 22:50:01 +0000
Subject: [PATCH] Thumb-2 load and store double description. But nothing yet
 creates them.

llvm-svn: 74566
---
 lib/Target/ARM/ARMISelDAGToDAG.cpp | 27 +++++++++++++++++++++++++++
 lib/Target/ARM/ARMInstrThumb2.td   | 14 +++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 527659a6234..258adb583ac 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -100,6 +100,8 @@ public:
                              SDValue &OffImm);
   bool SelectT2AddrModeImm8(SDValue Op, SDValue N, SDValue &Base,
                             SDValue &OffImm);
+  bool SelectT2AddrModeImm8s4(SDValue Op, SDValue N, SDValue &Base,
+                              SDValue &OffImm);
   bool SelectT2AddrModeSoReg(SDValue Op, SDValue N, SDValue &Base,
                              SDValue &OffReg, SDValue &ShImm);
 
@@ -613,6 +615,31 @@ bool ARMDAGToDAGISel::SelectT2AddrModeImm8(SDValue Op, SDValue N,
   return false;
 }
 
+bool ARMDAGToDAGISel::SelectT2AddrModeImm8s4(SDValue Op, SDValue N,
+                                             SDValue &Base, SDValue &OffImm) {
+  if (N.getOpcode() == ISD::ADD) {
+    if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
+      int RHSC = (int)RHS->getZExtValue();
+      if (((RHSC & 0x3) == 0) && (RHSC < 0 && RHSC > -0x400)) { // 8 bits.
+        Base   = N.getOperand(0);
+        OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32);
+        return true;
+      }
+    }
+  } else if (N.getOpcode() == ISD::SUB) {
+    if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
+      int RHSC = (int)RHS->getZExtValue();
+      if (((RHSC & 0x3) == 0) && (RHSC >= 0 && RHSC < 0x400)) { // 8 bits.
+        Base   = N.getOperand(0);
+        OffImm = CurDAG->getTargetConstant(-RHSC, MVT::i32);
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
 bool ARMDAGToDAGISel::SelectT2AddrModeSoReg(SDValue Op, SDValue N,
                                             SDValue &Base,
                                             SDValue &OffReg, SDValue &ShImm) {
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 810cb067f27..2bc71f87310 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -143,6 +143,13 @@ def t2addrmode_imm8 : Operand<i32>,
   let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
 }
 
+// t2addrmode_imm8s4  := reg + (imm8 << 2)
+def t2addrmode_imm8s4 : Operand<i32>,
+                        ComplexPattern<i32, 2, "SelectT2AddrModeImm8s4", []> {
+  let PrintMethod = "printT2AddrModeImm8Operand";
+  let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
+}
+
 // t2addrmode_so_reg  := reg + reg << imm2
 def t2addrmode_so_reg : Operand<i32>,
                         ComplexPattern<i32, 3, "SelectT2AddrModeSoReg", []> {
@@ -476,7 +483,7 @@ defm t2LDRSB : T2I_ld<"ldrsb", UnOpFrag<(sextloadi8  node:$Src)>>;
 
 let mayLoad = 1 in {
 // Load doubleword
-def t2LDRDi8 : T2Ii8s4<(outs GPR:$dst), (ins t2addrmode_imm8:$addr),
+def t2LDRDi8 : T2Ii8s4<(outs GPR:$dst), (ins t2addrmode_imm8s4:$addr),
                        "ldrd", " $dst, $addr", []>;
 def t2LDRDpci : T2Ii8s4<(outs GPR:$dst), (ins i32imm:$addr),
                        "ldrd", " $dst, $addr", []>;
@@ -527,6 +534,11 @@ defm t2STR   : T2I_st<"str", BinOpFrag<(store node:$LHS, node:$RHS)>>;
 defm t2STRB   : T2I_st<"strb", BinOpFrag<(truncstorei8 node:$LHS, node:$RHS)>>;
 defm t2STRH   : T2I_st<"strh", BinOpFrag<(truncstorei16 node:$LHS, node:$RHS)>>;
 
+// Store doubleword
+let mayLoad = 1 in
+def t2STRDi8 : T2Ii8s4<(outs), (ins GPR:$src, t2addrmode_imm8s4:$addr),
+                        "strd", " $src, $addr", []>;
+
 //===----------------------------------------------------------------------===//
 //  Move Instructions.
 //