AMDGPU/GlobalISel: InstrMapping for G_TRUNC

llvm-svn: 326588

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
index 3cafc0aa7d8..92a9a3a1783 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
@@ -314,6 +314,16 @@ AMDGPURegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
     OpdsMapping[0] = OpdsMapping[1] = AMDGPU::getValueMapping(BankID, Size);
     break;
   }
+  case AMDGPU::G_TRUNC: {
+    unsigned Dst = MI.getOperand(0).getReg();
+    unsigned Src = MI.getOperand(1).getReg();
+    unsigned Bank = getRegBankID(Src, MRI, *TRI);
+    unsigned DstSize = getSizeInBits(Dst, MRI, *TRI);
+    unsigned SrcSize = getSizeInBits(Src, MRI, *TRI);
+    OpdsMapping[0] = AMDGPU::getValueMapping(Bank, DstSize);
+    OpdsMapping[1] = AMDGPU::getValueMapping(Bank, SrcSize);
+    break;
+  }
   case AMDGPU::G_FCMP: {
     unsigned Size = MRI.getType(MI.getOperand(2).getReg()).getSizeInBits();
     unsigned Op2Bank = getRegBankID(MI.getOperand(2).getReg(), MRI, *TRI);