[Clang][AArch64] Add signed index/offset variants of sve2p1 qword stores (#120549)

This patch adds signed offset/index variants to the SVE2p1 quadword
store intrinsics, in accordance with
ARM-software/acle#359.

Author: SpencerAbson

clang/include/clang/Basic/arm_sve.td

@@ -474,7 +474,8 @@ let SVETargetGuard = "sve2p1", SMETargetGuard = InvalidMode in {
   def SVST1Q_SCATTER_U64BASE : MInst<"svst1q_scatter[_{2}base][_{d}]",  "vPgd", "cUcsUsiUilUlfhdb", [IsScatterStore, IsByteIndexed], MemEltTyDefault, "aarch64_sve_st1q_scatter_scalar_offset">;
 
   // Store one vector (scalar base + vector offset)
-  def SVST1Q_SCATTER_U64OFFSET : MInst<"svst1q_scatter_[{3}]offset[_{d}]", "vPpgd", "cUcsUsiUilUlfhdb", [IsScatterStore, IsByteIndexed], MemEltTyDefault, "aarch64_sve_st1q_scatter_vector_offset">;
+  def SVST1Q_SCATTER_OFFSETS_U : MInst<"svst1q_scatter_[{3}]offset[_{d}]", "vPpgd", "cUcsUsiUilUlfhdb", [IsScatterStore, IsByteIndexed], MemEltTyDefault, "aarch64_sve_st1q_scatter_vector_offset">;
+  def SVST1Q_SCATTER_OFFSETS_S : MInst<"svst1q_scatter_[{3}]offset[_{d}]", "vPp#d", "cUcsUsiUilUlfhdb", [IsScatterStore, IsByteIndexed], MemEltTyDefault, "aarch64_sve_st1q_scatter_vector_offset">;
 
   // Store N vectors into N-element structure (scalar base)
   defm SVST2Q : StructStore<"svst2q[_{d}]", "vPc2", "aarch64_sve_st2q">;
@@ -488,6 +489,7 @@ let SVETargetGuard = "sve2p1", SMETargetGuard = InvalidMode in {
 
   // Scatter store quadwords (scalar base + vector index)
   def SVST1Q_SCATTER_INDICES_U : MInst<"svst1q_scatter_[{3}]index[_{d}]", "vPpgd", "sUsiUilUlbhfd", [IsScatterStore], MemEltTyDefault, "aarch64_sve_st1q_scatter_index">;
+  def SVST1Q_SCATTER_INDICES_S : MInst<"svst1q_scatter_[{3}]index[_{d}]", "vPp#d", "sUsiUilUlbhfd", [IsScatterStore], MemEltTyDefault, "aarch64_sve_st1q_scatter_index">;
 
   // Scatter store quadwords (vector base + scalar index)
   def SVST1Q_SCATTER_INDEX_S   : MInst<"svst1q_scatter[_{2}base]_index[_{d}]", "vPgld", "sUsiUilUlbhfd", [IsScatterStore], MemEltTyDefault, "aarch64_sve_st1q_scatter_scalar_offset">;

clang/include/clang/Basic/arm_sve_sme_incl.td

@@ -101,6 +101,7 @@ include "arm_immcheck_incl.td"
 // [: svuint8_t
 // t: svint32_t
 // z: svuint32_t
+// #: svint64_t
 // g: svuint64_t
 // O: svfloat16_t
 // M: svfloat32_t