[ARM] Add MVE vector bit-operations (register inputs).

This includes all the obvious bitwise operations (AND, OR, BIC, ORN,
MVN) in register-to-register forms, and the immediate forms of
AND/OR/BIC/ORN; byte-order reverse instructions; and the VMOVs that
access a single lane of a vector.

Some of those VMOVs (specifically, the ones that access a 32-bit lane)
share an encoding with existing instructions that were disassembled as
accessing half of a d-register (e.g. `vmov.32 r0, d1[0]`), but in
8.1-M they're now written as accessing a quarter of a q-register (e.g.
`vmov.32 r0, q0[2]`). The older syntax is still accepted by the
assembler.

Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62673

llvm-svn: 363838

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 304f648d2a6..048b8c68db8 100644
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -504,6 +504,10 @@ template<bool Writeback>
 static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Insn,
                                           uint64_t Address,
                                           const void *Decoder);
+template <int shift>
+static DecodeStatus DecodeExpandedImmOperand(MCInst &Inst, unsigned Val,
+                                             uint64_t Address,
+                                             const void *Decoder);
 static DecodeStatus DecodeMVEOverlappingLongShift(MCInst &Inst, unsigned Insn,
                                                   uint64_t Address,
                                                   const void *Decoder);
@@ -6025,6 +6029,16 @@ static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Val,
   return S;
 }
 
+template <int shift>
+static DecodeStatus DecodeExpandedImmOperand(MCInst &Inst, unsigned Val,
+                                             uint64_t Address,
+                                             const void *Decoder) {
+    Val <<= shift;
+
+    Inst.addOperand(MCOperand::createImm(Val));
+    return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeMVEOverlappingLongShift(
   MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder) {
   DecodeStatus S = MCDisassembler::Success;