From 0d0d6c2f2515b20ff287107c8d1a07c920558bf1 Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Wed, 12 Apr 2017 21:58:23 +0000
Subject: AMDGPU: Fix invalid copies when copying i1 to phys reg

Insert a VReg_1 virtual register so the i1 workaround pass
can handle it.

llvm-svn: 300113
---
 llvm/lib/Target/AMDGPU/SIISelLowering.cpp | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'llvm/lib/Target/AMDGPU/SIISelLowering.cpp')

diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index eda825d8c6e..7268131396d 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -4885,8 +4885,33 @@ static bool isFrameIndexOp(SDValue Op) {
 /// \brief Legalize target independent instructions (e.g. INSERT_SUBREG)
 /// with frame index operands.
 /// LLVM assumes that inputs are to these instructions are registers.
-void SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
-                                                     SelectionDAG &DAG) const {
+SDNode *SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
+                                                        SelectionDAG &DAG) const {
+  if (Node->getOpcode() == ISD::CopyToReg) {
+    RegisterSDNode *DestReg = cast<RegisterSDNode>(Node->getOperand(1));
+    SDValue SrcVal = Node->getOperand(2);
+
+    // Insert a copy to a VReg_1 virtual register so LowerI1Copies doesn't have
+    // to try understanding copies to physical registers.
+    if (SrcVal.getValueType() == MVT::i1 &&
+        TargetRegisterInfo::isPhysicalRegister(DestReg->getReg())) {
+      SDLoc SL(Node);
+      MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
+      SDValue VReg = DAG.getRegister(
+        MRI.createVirtualRegister(&AMDGPU::VReg_1RegClass), MVT::i1);
+
+      SDNode *Glued = Node->getGluedNode();
+      SDValue ToVReg
+        = DAG.getCopyToReg(Node->getOperand(0), SL, VReg, SrcVal,
+                         SDValue(Glued, Glued ? Glued->getNumValues() - 1 : 0));
+      SDValue ToResultReg
+        = DAG.getCopyToReg(ToVReg, SL, SDValue(DestReg, 0),
+                           VReg, ToVReg.getValue(1));
+      DAG.ReplaceAllUsesWith(Node, ToResultReg.getNode());
+      DAG.RemoveDeadNode(Node);
+      return ToResultReg.getNode();
+    }
+  }
 
   SmallVector<SDValue, 8> Ops;
   for (unsigned i = 0; i < Node->getNumOperands(); ++i) {
@@ -4902,6 +4927,7 @@ void SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
   }
 
   DAG.UpdateNodeOperands(Node, Ops);
+  return Node;
 }
 
 /// \brief Fold the instructions after selecting them.
-- 
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