[RISCV] Add Qualcomm uC Xqcisync (Sync Delay) extension (#132184)

This extension adds nine instructions, eight for non-memory-mapped
devices synchronization and delay instruction.

The current spec can be found at:
https://github.com/quic/riscv-unified-db/releases/tag/Xqci-0.7.0

This patch adds assembler only support.

Co-authored-by: Sudharsan Veeravalli <quic_svs@quicinc.com>

1 files changed, 18 insertions, 8 deletions

diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 5abf15a..93cbf66 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -370,6 +370,15 @@ static DecodeStatus decodeUImmPlus1OperandGE(MCInst &Inst, uint32_t Imm,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus decodeUImmSlistOperand(MCInst &Inst, uint32_t Imm,
+                                           int64_t Address,
+                                           const MCDisassembler *Decoder) {
+  assert(isUInt<3>(Imm) && "Invalid Slist immediate");
+  const uint8_t Slist[] = {0, 1, 2, 4, 8, 16, 15, 31};
+  Inst.addOperand(MCOperand::createImm(Slist[Imm]));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus decodeUImmLog2XLenOperand(MCInst &Inst, uint32_t Imm,
                                               int64_t Address,
                                               const MCDisassembler *Decoder) {
@@ -663,14 +672,15 @@ static constexpr FeatureBitset XRivosFeatureGroup = {
 };
 
 static constexpr FeatureBitset XqciFeatureGroup = {
-    RISCV::FeatureVendorXqcia,   RISCV::FeatureVendorXqciac,
-    RISCV::FeatureVendorXqcibi,  RISCV::FeatureVendorXqcibm,
-    RISCV::FeatureVendorXqcicli, RISCV::FeatureVendorXqcicm,
-    RISCV::FeatureVendorXqcics,  RISCV::FeatureVendorXqcicsr,
-    RISCV::FeatureVendorXqciint, RISCV::FeatureVendorXqcilb,
-    RISCV::FeatureVendorXqcili,  RISCV::FeatureVendorXqcilia,
-    RISCV::FeatureVendorXqcilo,  RISCV::FeatureVendorXqcilsm,
-    RISCV::FeatureVendorXqcisim, RISCV::FeatureVendorXqcisls,
+    RISCV::FeatureVendorXqcia,    RISCV::FeatureVendorXqciac,
+    RISCV::FeatureVendorXqcibi,   RISCV::FeatureVendorXqcibm,
+    RISCV::FeatureVendorXqcicli,  RISCV::FeatureVendorXqcicm,
+    RISCV::FeatureVendorXqcics,   RISCV::FeatureVendorXqcicsr,
+    RISCV::FeatureVendorXqciint,  RISCV::FeatureVendorXqcilb,
+    RISCV::FeatureVendorXqcili,   RISCV::FeatureVendorXqcilia,
+    RISCV::FeatureVendorXqcilo,   RISCV::FeatureVendorXqcilsm,
+    RISCV::FeatureVendorXqcisim,  RISCV::FeatureVendorXqcisls,
+    RISCV::FeatureVendorXqcisync,
 };
 
 static constexpr FeatureBitset XSfVectorGroup = {