Thumb-2 load and store double description. But nothing yet creates them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74566 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 527659a..258adb5 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -100,6 +100,8 @@
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 @@
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) {