[AVR] Do not select unimplemented pseudo instructions

Reviewed By: aykevl, Miss_Grape

Differential Revision: https://reviews.llvm.org/D141210

diff --git a/llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp b/llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
index f471e72..2c97dea 100644 (file)
--- a/llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
@@ -888,7 +888,7 @@ bool AVRExpandPseudo::expand<AVR::LPMWRdZPi>(Block &MBB, BlockIt MBBI) {
 
 template <>
 bool AVRExpandPseudo::expand<AVR::ELPMBRdZPi>(Block &MBB, BlockIt MBBI) {
-  llvm_unreachable("byte ELPMPi is unimplemented");
+  llvm_unreachable("8-bit ELPMPi is unimplemented");
 }
 
 template <>

diff --git a/llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp b/llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp
index 67b822a..36d2e8c 100644 (file)
--- a/llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp
@@ -188,18 +188,13 @@ unsigned AVRDAGToDAGISel::selectIndexedProgMemLoad(const LoadSDNode *LD, MVT VT,
   unsigned Opcode = 0;
   int Offs = cast<ConstantSDNode>(LD->getOffset())->getSExtValue();
 
-  switch (VT.SimpleTy) {
-  case MVT::i8:
-    if (Offs == 1)
-      Opcode = Bank > 0 ? AVR::ELPMBRdZPi : AVR::LPMRdZPi;
-    break;
-  case MVT::i16:
-    if (Offs == 2)
-      Opcode = Bank > 0 ? AVR::ELPMWRdZPi : AVR::LPMWRdZPi;
-    break;
-  default:
-    break;
-  }
+  if (VT.SimpleTy == MVT::i8 && Offs == 1 && Bank == 0)
+    Opcode = AVR::LPMRdZPi;
+
+  // TODO: Implements the expansion of the following pseudo instructions.
+  // LPMWRdZPi:  type == MVT::i16, offset == 2, Bank == 0.
+  // ELPMBRdZPi: type == MVT::i8,  offset == 1, Bank >  0.
+  // ELPMWRdZPi: type == MVT::i16, offset == 2, Bank >  0.
 
   return Opcode;
 }