1 files changed, 59 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
index 72d5d6d09fe..af75aee7410 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
@@ -50,6 +50,24 @@ AMDGPURegisterBankInfo::AMDGPURegisterBankInfo(const TargetRegisterInfo &TRI)
 
 }
 
+static bool isConstant(const MachineOperand &MO, int64_t &C) {
+  const MachineFunction *MF = MO.getParent()->getParent()->getParent();
+  const MachineRegisterInfo &MRI = MF->getRegInfo();
+  const MachineInstr *Def = MRI.getVRegDef(MO.getReg());
+  if (!Def)
+    return false;
+
+  if (Def->getOpcode() == AMDGPU::G_CONSTANT) {
+    C = Def->getOperand(1).getCImm()->getSExtValue();
+    return true;
+  }
+
+  if (Def->getOpcode() == AMDGPU::COPY)
+    return isConstant(Def->getOperand(1), C);
+
+  return false;
+}
+
 unsigned AMDGPURegisterBankInfo::copyCost(const RegisterBank &Dst,
                                           const RegisterBank &Src,
                                           unsigned Size) const {
@@ -415,6 +433,47 @@ AMDGPURegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
     OpdsMapping[3] = AMDGPU::getValueMapping(Op3Bank, Size);
     break;
   }
+
+
+  case AMDGPU::G_EXTRACT_VECTOR_ELT: {
+    unsigned IdxOp = 2;
+    int64_t Imm;
+    // XXX - Do we really need to fully handle these? The constant case should
+    // be legalized away before RegBankSelect?
+
+    unsigned OutputBankID = isSALUMapping(MI) && isConstant(MI.getOperand(IdxOp), Imm) ?
+                            AMDGPU::SGPRRegBankID : AMDGPU::VGPRRegBankID;
+
+    unsigned IdxBank = getRegBankID(MI.getOperand(2).getReg(), MRI, *TRI);
+    OpdsMapping[0] = AMDGPU::getValueMapping(OutputBankID, MRI.getType(MI.getOperand(0).getReg()).getSizeInBits());
+    OpdsMapping[1] = AMDGPU::getValueMapping(OutputBankID, MRI.getType(MI.getOperand(1).getReg()).getSizeInBits());
+
+    // The index can be either if the source vector is VGPR.
+    OpdsMapping[2] = AMDGPU::getValueMapping(IdxBank, MRI.getType(MI.getOperand(2).getReg()).getSizeInBits());
+    break;
+  }
+  case AMDGPU::G_INSERT_VECTOR_ELT: {
+    // XXX - Do we really need to fully handle these? The constant case should
+    // be legalized away before RegBankSelect?
+
+    int64_t Imm;
+
+    unsigned IdxOp = MI.getOpcode() == AMDGPU::G_EXTRACT_VECTOR_ELT ? 2 : 3;
+    unsigned BankID = isSALUMapping(MI) && isConstant(MI.getOperand(IdxOp), Imm) ?
+                      AMDGPU::SGPRRegBankID : AMDGPU::VGPRRegBankID;
+
+
+
+    // TODO: Can do SGPR indexing, which would obviate the need for the
+    // isConstant check.
+    for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
+      unsigned Size = getSizeInBits(MI.getOperand(i).getReg(), MRI, *TRI);
+      OpdsMapping[i] = AMDGPU::getValueMapping(BankID, Size);
+    }
+
+
+    break;
+  }
   case AMDGPU::G_INTRINSIC: {
     switch(MI.getOperand(1).getIntrinsicID()) {
     default: