+/// DisassembleSatFrm - Disassemble saturate instructions:
+/// SSAT, SSAT16, USAT, and USAT16.
+static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
+ unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
+
+ const TargetInstrDesc &TID = ARMInsts[Opcode];
+ NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
+
+ // Disassemble register def.
+ MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
+ decodeRd(insn))));
+
+ unsigned Pos = slice(insn, 20, 16);
+ if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
+ Pos += 1;
+ MI.addOperand(MCOperand::CreateImm(Pos));
+
+ MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
+ decodeRm(insn))));
+
+ if (NumOpsAdded == 4) {
+ ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
+ // Inst{11-7} encodes the imm5 shift amount.
+ unsigned ShAmt = slice(insn, 11, 7);
+ if (ShAmt == 0) {
+ // A8.6.183. Possible ASR shift amount of 32...
+ if (Opc == ARM_AM::asr)
+ ShAmt = 32;
+ else
+ Opc = ARM_AM::no_shift;
+ }
+ MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
+ }
+ return true;
+}
+