[mips][microMIPS] Fix the definition of MOVEP instruction

The patch fixes definition of MOVEP instruction. Two registers are used
instead of register pairs. This is necessary as machine verifier cannot
handle register pairs.

Patch by Milena Vujosevic Janicic.

Differential revision: https://reviews.llvm.org/D52035

llvm-svn: 342571

1 files changed, 29 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
index b94afb9520e..27b27ff1e1e 100644
--- a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
+++ b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
@@ -538,6 +538,9 @@ static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned RegPair,
                                        uint64_t Address,
                                        const void *Decoder);
 
+static DecodeStatus DecodeMovePOperands(MCInst &Inst, unsigned Insn,
+                                        uint64_t Address, const void *Decoder);
+
 namespace llvm {
 
 Target &getTheMipselTarget();
@@ -2450,6 +2453,32 @@ static DecodeStatus DecodeRegListOperand16(MCInst &Inst, unsigned Insn,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeMovePOperands(MCInst &Inst, unsigned Insn,
+                                          uint64_t Address,
+                                          const void *Decoder) {
+  unsigned RegPair = fieldFromInstruction(Insn, 7, 3);
+  if (DecodeMovePRegPair(Inst, RegPair, Address, Decoder) ==
+      MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+
+  unsigned RegRs;
+  if (static_cast<const MipsDisassembler*>(Decoder)->hasMips32r6())
+    RegRs = fieldFromInstruction(Insn, 0, 2) |
+            (fieldFromInstruction(Insn, 3, 1) << 2);
+  else
+    RegRs = fieldFromInstruction(Insn, 1, 3);
+  if (DecodeGPRMM16MovePRegisterClass(Inst, RegRs, Address, Decoder) ==
+      MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+
+  unsigned RegRt = fieldFromInstruction(Insn, 4, 3);
+  if (DecodeGPRMM16MovePRegisterClass(Inst, RegRt, Address, Decoder) ==
+      MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned RegPair,
                                        uint64_t Address, const void *Decoder) {
   switch (RegPair) {