[AArch64][SME2] Add multi-vector builtins for cvt (#74450)

Adds builtins for:
- FCVT
- BFCVT
- FCVTZS
- FCVTZU
- SCVTF
- UCVTF
- BFCVTN
- FCVTN
- SQCVT
- SQCVTU
- UQCVT
- SQCVTN
- SQCVTUN
- UQCVTN

See ARM-software/acle#217

Author: MDevereau

clang/include/clang/Basic/arm_sve.td

@@ -2164,3 +2164,63 @@ let TargetGuard = "sve2p1" in {
   defm SVPMOV_TO_VEC_LANE_S : PMOV_TO_VEC<"svpmov", "iUi", "aarch64_sve_pmov_to_vector_lane", [], ImmCheck1_3>;
   defm SVPMOV_TO_VEC_LANE_D : PMOV_TO_VEC<"svpmov", "lUl", "aarch64_sve_pmov_to_vector_lane" ,[], ImmCheck1_7>;
 }
+
+//
+// Multi-vector convert to/from floating-point.
+//
+let TargetGuard = "sme2" in {
+  def SVCVT_F16_X2  : SInst<"svcvt_f16[_f32_x2]", "e2", "f", MergeNone, "aarch64_sve_fcvt_x2", [IsStreaming],[]>;
+  def SVCVT_BF16_X2 : SInst<"svcvt_bf16[_f32_x2]", "$2", "f", MergeNone, "aarch64_sve_bfcvt_x2", [IsOverloadNone, IsStreaming],[]>;
+
+  def SVCVT_F32_U32_X2 : SInst<"svcvt_{d}[_u32_x2]", "2.d2.u", "f", MergeNone, "aarch64_sve_fcvtu_x2", [IsStreaming], []>;
+  def SVCVT_U32_F32_X2 : SInst<"svcvt_u32[_{d}_x2]", "2.u2.d", "f", MergeNone, "aarch64_sve_ucvtf_x2", [IsStreaming], []>;
+  def SVCVT_F32_S32_X2 : SInst<"svcvt_{d}[_s32_x2]", "2.d2.x", "f", MergeNone, "aarch64_sve_fcvts_x2", [IsStreaming], []>;
+  def SVCVT_S32_F32_X2 : SInst<"svcvt_s32[_{d}_x2]", "2.x2.d", "f", MergeNone, "aarch64_sve_scvtf_x2", [IsStreaming], []>;
+
+  def SVCVT_F32_U32_X4 : SInst<"svcvt_{d}[_u32_x4]", "4.d4.u", "f", MergeNone, "aarch64_sve_fcvtu_x4", [IsStreaming], []>;
+  def SVCVT_U32_F32_X4 : SInst<"svcvt_u32[_{d}_x4]", "4.u4.d", "f", MergeNone, "aarch64_sve_ucvtf_x4", [IsStreaming], []>;
+  def SVCVT_F32_S32_X4 : SInst<"svcvt_{d}[_s32_x4]", "4.d4.x", "f", MergeNone, "aarch64_sve_fcvts_x4", [IsStreaming], []>;
+  def SVCVT_S32_F32_X4 : SInst<"svcvt_s32[_{d}_x4]", "4.x4.d", "f", MergeNone, "aarch64_sve_scvtf_x4", [IsStreaming], []>;
+}
+
+//
+// Multi-vector floating-point convert from single-precision to interleaved half-precision/BFloat16
+//
+let TargetGuard = "sme2" in {
+  def SVCVTN_F16_X2  : SInst<"svcvtn_f16[_f32_x2]", "e2", "f", MergeNone, "aarch64_sve_fcvtn_x2", [IsStreaming],[]>;
+  def SVCVTN_BF16_X2 : SInst<"svcvtn_bf16[_f32_x2]", "$2", "f", MergeNone, "aarch64_sve_bfcvtn_x2", [IsOverloadNone, IsStreaming],[]>;
+}
+
+//
+// Multi-vector saturating extract narrow
+//
+let TargetGuard = "sme2" in {
+ def SVQCVT_S16_S32_X2 : SInst<"svqcvt_s16[_{d}_x2]", "h2.d", "i", MergeNone, "aarch64_sve_sqcvt_x2", [IsStreaming], []>;
+ def SVQCVT_U16_U32_X2 : SInst<"svqcvt_u16[_{d}_x2]", "e2.d", "Ui", MergeNone, "aarch64_sve_uqcvt_x2", [IsStreaming], []>;
+ def SVQCVT_U16_S32_X2 : SInst<"svqcvt_u16[_{d}_x2]", "e2.d", "i", MergeNone, "aarch64_sve_sqcvtu_x2", [IsStreaming], []>;
+
+  def SVQCVT_S8_S32_X4 : SInst<"svqcvt_s8[_{d}_x4]", "q4.d", "i", MergeNone, "aarch64_sve_sqcvt_x4", [IsStreaming], []>;
+  def SVQCVT_U8_U32_X4 : SInst<"svqcvt_u8[_{d}_x4]", "b4.d", "Ui", MergeNone, "aarch64_sve_uqcvt_x4", [IsStreaming], []>;
+  def SVQCVT_U8_S32_X4 : SInst<"svqcvt_u8[_{d}_x4]", "b4.d", "i", MergeNone, "aarch64_sve_sqcvtu_x4", [IsStreaming], []>;
+
+  def SVQCVT_S16_S64_X4 : SInst<"svqcvt_s16[_{d}_x4]", "q4.d", "l", MergeNone, "aarch64_sve_sqcvt_x4", [IsStreaming], []>;
+  def SVQCVT_U16_U64_X4 : SInst<"svqcvt_u16[_{d}_x4]", "b4.d", "Ul", MergeNone, "aarch64_sve_uqcvt_x4", [IsStreaming], []>;
+  def SVQCVT_U16_S64_X4 : SInst<"svqcvt_u16[_{d}_x4]", "b4.d", "l", MergeNone, "aarch64_sve_sqcvtu_x4", [IsStreaming], []>;
+}
+
+//
+// Multi-vector saturating extract narrow and interleave
+//
+let TargetGuard = "sme2" in {
+  def SVQCVTN_S16_S32_X2 : SInst<"svqcvtn_s16[_{d}_x2]", "h2.d", "i", MergeNone, "aarch64_sve_sqcvtn_x2", [IsStreamingCompatible], []>;
+  def SVQCVTN_U16_U32_X2 : SInst<"svqcvtn_u16[_{d}_x2]", "e2.d", "Ui", MergeNone, "aarch64_sve_uqcvtn_x2", [IsStreamingCompatible], []>;
+  def SVQCVTN_U16_S32_X2 : SInst<"svqcvtn_u16[_{d}_x2]", "e2.d", "i", MergeNone, "aarch64_sve_sqcvtun_x2", [IsStreamingCompatible], []>;
+
+  def SVQCVTN_S8_S32_X4 : SInst<"svqcvtn_s8[_{d}_x4]", "q4.d", "i", MergeNone, "aarch64_sve_sqcvtn_x4", [IsStreaming], []>;
+  def SVQCVTN_U8_U32_X4 : SInst<"svqcvtn_u8[_{d}_x4]", "b4.d", "Ui", MergeNone, "aarch64_sve_uqcvtn_x4", [IsStreaming], []>;
+  def SVQCVTN_U8_S32_X4 : SInst<"svqcvtn_u8[_{d}_x4]", "b4.d", "i", MergeNone, "aarch64_sve_sqcvtun_x4", [IsStreaming], []>;
+
+  def SVQCVTN_S16_S64_X4 : SInst<"svqcvtn_s16[_{d}_x4]", "q4.d", "l", MergeNone, "aarch64_sve_sqcvtn_x4", [IsStreaming], []>;
+  def SVQCVTN_U16_U64_X4 : SInst<"svqcvtn_u16[_{d}_x4]", "b4.d", "Ul", MergeNone, "aarch64_sve_uqcvtn_x4", [IsStreaming], []>;
+  def SVQCVTN_U16_S64_X4 : SInst<"svqcvtn_u16[_{d}_x4]", "b4.d", "l", MergeNone, "aarch64_sve_sqcvtun_x4", [IsStreaming], []>;
+}