In Thumb1 mode the constant might be materialized via the load from constpool. Emit...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127105 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index fa06bf7eeb5b14928c037d3c701faea375512382..135148d1645880c2a8a25012fff64cea3d1bbfaa 100644 (file)
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -817,6 +817,7 @@ void ARMAsmPrinter::EmitUnwindingInstruction(const MachineInstr *MI) {
 
   const MachineFunction &MF = *MI->getParent()->getParent();
   const TargetRegisterInfo *RegInfo = MF.getTarget().getRegisterInfo();
+  const ARMFunctionInfo &AFI = *MF.getInfo<ARMFunctionInfo>();
 
   unsigned FramePtr = RegInfo->getFrameRegister(MF);
   unsigned Opc = MI->getOpcode();
@@ -896,10 +897,23 @@ void ARMAsmPrinter::EmitUnwindingInstruction(const MachineInstr *MI) {
       case ARM::tADDrSPi:
         Offset = -MI->getOperand(2).getImm()*4;
         break;
-      case ARM::tLDRpci:
-        assert(0 && "Not implemented yet!");
+      case ARM::tLDRpci: {
+        // Grab the constpool index and check, whether it corresponds to
+        // original or cloned constpool entry.
+        unsigned CPI = MI->getOperand(1).getIndex();
+        const MachineConstantPool *MCP = MF.getConstantPool();
+        if (CPI >= MCP->getConstants().size())
+          CPI = AFI.getOriginalCPIdx(CPI);
+        assert(CPI != -1U && "Invalid constpool index");
+
+        // Derive the actual offset.
+        const MachineConstantPoolEntry &CPE = MCP->getConstants()[CPI];
+        assert(!CPE.isMachineConstantPoolEntry() && "Invalid constpool entry");
+        // FIXME: Check for user, it should be "add" instruction!
+        Offset = -cast<ConstantInt>(CPE.Val.ConstVal)->getSExtValue();
         break;
       }
+      }
 
       if (DstReg == FramePtr && FramePtr != ARM::SP)
         // Set-up of the frame pointer.

diff --git a/lib/Target/ARM/Thumb1RegisterInfo.cpp b/lib/Target/ARM/Thumb1RegisterInfo.cpp
index 4d272ee42488670937841156503e394a0c08f41e..d1d7ec49e351e69442d2362a50b61de04ba7245b 100644 (file)
--- a/lib/Target/ARM/Thumb1RegisterInfo.cpp
+++ b/lib/Target/ARM/Thumb1RegisterInfo.cpp
@@ -65,9 +65,9 @@ Thumb1RegisterInfo::emitLoadConstPool(MachineBasicBlock &MBB,
   unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
 
   BuildMI(MBB, MBBI, dl, TII.get(ARM::tLDRpci))
-          .addReg(DestReg, getDefRegState(true), SubIdx)
-          .addConstantPoolIndex(Idx).addImm(Pred).addReg(PredReg)
-          .setMIFlags(MIFlags)
+    .addReg(DestReg, getDefRegState(true), SubIdx)
+    .addConstantPoolIndex(Idx).addImm(Pred).addReg(PredReg)
+    .setMIFlags(MIFlags);
 }