Add XCore support for indirectbr / blockaddress.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89273 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/XCore/AsmPrinter/XCoreAsmPrinter.cpp

@@ -333,6 +333,8 @@ void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
   case MachineOperand::MO_JumpTableIndex:
     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
       << '_' << MO.getIndex();
+  case MachineOperand::MO_BlockAddress:
+    GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
     break;
   default:
     llvm_unreachable("not implemented");

lib/Target/XCore/XCoreISelLowering.cpp

@@ -111,7 +111,8 @@ XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM)
   setOperationAction(ISD::JumpTable, MVT::i32, Custom);
 
   setOperationAction(ISD::GlobalAddress, MVT::i32,   Custom);
-  
+  setOperationAction(ISD::BlockAddress, MVT::i32 , Custom);
+
   // Thread Local Storage
   setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
   
@@ -158,6 +159,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) {
   {
   case ISD::GlobalAddress:    return LowerGlobalAddress(Op, DAG);
   case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
+  case ISD::BlockAddress:     return LowerBlockAddress(Op, DAG);
   case ISD::ConstantPool:     return LowerConstantPool(Op, DAG);
   case ISD::JumpTable:        return LowerJumpTable(Op, DAG);
   case ISD::LOAD:             return LowerLOAD(Op, DAG);
@@ -287,6 +289,17 @@ LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG)
   return DAG.getNode(ISD::ADD, dl, MVT::i32, base, offset);
 }
 
+SDValue XCoreTargetLowering::
+LowerBlockAddress(SDValue Op, SelectionDAG &DAG)
+{
+  DebugLoc DL = Op.getDebugLoc();
+
+  BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
+  SDValue Result = DAG.getBlockAddress(BA, DL, /*isTarget=*/true);
+
+  return DAG.getNode(XCoreISD::PCRelativeWrapper, DL, getPointerTy(), Result);
+}
+
 SDValue XCoreTargetLowering::
 LowerConstantPool(SDValue Op, SelectionDAG &DAG)
 {

lib/Target/XCore/XCoreISelLowering.h

@@ -120,6 +120,7 @@ namespace llvm {
     SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG);
     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
+    SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG);
     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG);
     SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG);
     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);

lib/Target/XCore/XCoreInstrInfo.td

@@ -679,6 +679,12 @@ def LDAP_lu10 : _FLU10<
                   "ldap r11, $addr",
                   [(set R11, (pcrelwrapper tglobaladdr:$addr))]>;
 
+let Defs = [R11], isReMaterializable = 1 in
+def LDAP_lu10_ba : _FLU10<(outs),
+                          (ins i32imm:$addr),
+                          "ldap r11, $addr",
+                          [(set R11, (pcrelwrapper tblockaddress:$addr))]>;
+
 let isCall=1,
 // All calls clobber the the link register and the non-callee-saved registers:
 Defs = [R0, R1, R2, R3, R11, LR] in {

test/CodeGen/XCore/indirectbr.ll

@@ -0,0 +1,45 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+
+@nextaddr = global i8* null                       ; <i8**> [#uses=2]
+@C.0.2070 = private constant [5 x i8*] [i8* blockaddress(@foo, %L1), i8* blockaddress(@foo, %L2), i8* blockaddress(@foo, %L3), i8* blockaddress(@foo, %L4), i8* blockaddress(@foo, %L5)] ; <[5 x i8*]*> [#uses=1]
+
+define internal i32 @foo(i32 %i) nounwind {
+; CHECK: foo:
+entry:
+  %0 = load i8** @nextaddr, align 4               ; <i8*> [#uses=2]
+  %1 = icmp eq i8* %0, null                       ; <i1> [#uses=1]
+  br i1 %1, label %bb3, label %bb2
+
+bb2:                                              ; preds = %entry, %bb3
+  %gotovar.4.0 = phi i8* [ %gotovar.4.0.pre, %bb3 ], [ %0, %entry ] ; <i8*> [#uses=1]
+; CHECK: bau
+  indirectbr i8* %gotovar.4.0, [label %L5, label %L4, label %L3, label %L2, label %L1]
+
+bb3:                                              ; preds = %entry
+  %2 = getelementptr inbounds [5 x i8*]* @C.0.2070, i32 0, i32 %i ; <i8**> [#uses=1]
+  %gotovar.4.0.pre = load i8** %2, align 4        ; <i8*> [#uses=1]
+  br label %bb2
+
+L5:                                               ; preds = %bb2
+  br label %L4
+
+L4:                                               ; preds = %L5, %bb2
+  %res.0 = phi i32 [ 385, %L5 ], [ 35, %bb2 ]     ; <i32> [#uses=1]
+  br label %L3
+
+L3:                                               ; preds = %L4, %bb2
+  %res.1 = phi i32 [ %res.0, %L4 ], [ 5, %bb2 ]   ; <i32> [#uses=1]
+  br label %L2
+
+L2:                                               ; preds = %L3, %bb2
+  %res.2 = phi i32 [ %res.1, %L3 ], [ 1, %bb2 ]   ; <i32> [#uses=1]
+  %phitmp = mul i32 %res.2, 6                     ; <i32> [#uses=1]
+  br label %L1
+
+L1:                                               ; preds = %L2, %bb2
+  %res.3 = phi i32 [ %phitmp, %L2 ], [ 2, %bb2 ]  ; <i32> [#uses=1]
+; CHECK: ldap r11, .LBA3_foo_L5
+; CHECK: stw r11, dp[nextaddr]
+  store i8* blockaddress(@foo, %L5), i8** @nextaddr, align 4
+  ret i32 %res.3
+}