[PATCH] R600: Reenable llvm.R600.load.input/interp.input for compatibility

[Vincent Lejeune]

This patch reenable older input handling intrinsics to keep compatibility between mesa 9.2.

http://llvm-reviews.chandlerc.com/D2140

Files:
  lib/Target/R600/R600ISelLowering.cpp
  lib/Target/R600/R600Intrinsics.td

Index: lib/Target/R600/R600ISelLowering.cpp
===================================================================
--- lib/Target/R600/R600ISelLowering.cpp
+++ lib/Target/R600/R600ISelLowering.cpp
@@ -583,6 +583,51 @@
     SDLoc DL(Op);
     switch(IntrinsicID) {
     default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
+    case AMDGPUIntrinsic::R600_load_input: {
+      int64_t RegIndex = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
+      unsigned Reg = AMDGPU::R600_TReg32RegClass.getRegister(RegIndex);
+      MachineFunction &MF = DAG.getMachineFunction();
+      MachineRegisterInfo &MRI = MF.getRegInfo();
+      MRI.addLiveIn(Reg);
+      return DAG.getCopyFromReg(DAG.getEntryNode(),
+          SDLoc(DAG.getEntryNode()), Reg, VT);
+    }
+
+    case AMDGPUIntrinsic::R600_interp_input: {
+      int slot = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
+      int ijb = cast<ConstantSDNode>(Op.getOperand(2))->getSExtValue();
+      MachineSDNode *interp;
+      if (ijb < 0) {
+        const MachineFunction &MF = DAG.getMachineFunction();
+        const R600InstrInfo *TII =
+          static_cast<const R600InstrInfo*>(MF.getTarget().getInstrInfo());
+        interp = DAG.getMachineNode(AMDGPU::INTERP_VEC_LOAD, DL,
+            MVT::v4f32, DAG.getTargetConstant(slot / 4 , MVT::i32));
+        return DAG.getTargetExtractSubreg(
+            TII->getRegisterInfo().getSubRegFromChannel(slot % 4),
+            DL, MVT::f32, SDValue(interp, 0));
+      }
+      MachineFunction &MF = DAG.getMachineFunction();
+      MachineRegisterInfo &MRI = MF.getRegInfo();
+      unsigned RegisterI = AMDGPU::R600_TReg32RegClass.getRegister(2 * ijb);
+      unsigned RegisterJ = AMDGPU::R600_TReg32RegClass.getRegister(2 * ijb + 1);
+      MRI.addLiveIn(RegisterI);
+      MRI.addLiveIn(RegisterJ);
+      SDValue RegisterINode = DAG.getCopyFromReg(DAG.getEntryNode(),
+          SDLoc(DAG.getEntryNode()), RegisterI, MVT::f32);
+      SDValue RegisterJNode = DAG.getCopyFromReg(DAG.getEntryNode(),
+          SDLoc(DAG.getEntryNode()), RegisterJ, MVT::f32);
+
+      if (slot % 4 < 2)
+        interp = DAG.getMachineNode(AMDGPU::INTERP_PAIR_XY, DL,
+            MVT::f32, MVT::f32, DAG.getTargetConstant(slot / 4 , MVT::i32),
+            RegisterJNode, RegisterINode);
+      else
+        interp = DAG.getMachineNode(AMDGPU::INTERP_PAIR_ZW, DL,
+            MVT::f32, MVT::f32, DAG.getTargetConstant(slot / 4 , MVT::i32),
+            RegisterJNode, RegisterINode);
+      return SDValue(interp, slot % 2);
+    }
     case AMDGPUIntrinsic::R600_interp_xy:
     case AMDGPUIntrinsic::R600_interp_zw: {
       int slot = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
Index: lib/Target/R600/R600Intrinsics.td
===================================================================
--- lib/Target/R600/R600Intrinsics.td
+++ lib/Target/R600/R600Intrinsics.td
@@ -39,6 +39,8 @@
       llvm_i32_ty // coord_type_w
     ], [IntrNoMem]>;
 
+  def int_R600_load_input :
+    Intrinsic<[llvm_float_ty], [llvm_i32_ty], [IntrNoMem]>;
   def int_R600_interp_input :
     Intrinsic<[llvm_float_ty], [llvm_i32_ty, llvm_i32_ty], [IntrNoMem]>;
   def int_R600_interp_const :
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