[XCore] Remove '-' from back branch asm syntax.

Instead operands are treated as negative immediates
where the sign bit is implicit in the instruction
encoding.

llvm-svn: 181151

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp b/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
index 7282f2f1e5c..a2ae40c58a6 100644
--- a/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
+++ b/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
@@ -97,6 +97,9 @@ static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst,
 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
                                       uint64_t Address, const void *Decoder);
 
+static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
+                                        uint64_t Address, const void *Decoder);
+
 static DecodeStatus Decode2RInstruction(MCInst &Inst,
                                         unsigned Insn,
                                         uint64_t Address,
@@ -239,6 +242,12 @@ static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
+                                        uint64_t Address, const void *Decoder) {
+  Inst.addOperand(MCOperand::CreateImm(-(int64_t)Val));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus
 Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2) {
   unsigned Combined = fieldFromInstruction(Insn, 6, 5);