Author: Andy Kaylor
Date: 2025-12-03T09:30:16-08:00
New Revision: 817ab49ece9b0ccafd9a01ad7bd910c102f161c2

URL: 
https://github.com/llvm/llvm-project/commit/817ab49ece9b0ccafd9a01ad7bd910c102f161c2
DIFF: 
https://github.com/llvm/llvm-project/commit/817ab49ece9b0ccafd9a01ad7bd910c102f161c2.diff

LOG: [CIR][NFC] Add infrastructure for AArch64 builtins (#170386)

This change adds the basic code structure for handling AArch64 builtins.
The structure of this code is brought over from classic codegen to make
implementing missing builtins easier. In some cases, the handling
involved too much logic for a simple NFC change, so those parts were
replaced with a MissingFeature assert.

The actual handling for all builtins is left for later changes.

Added: 
    clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp

Modified: 
    clang/include/clang/CIR/MissingFeatures.h
    clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
    clang/lib/CIR/CodeGen/CIRGenFunction.h
    clang/lib/CIR/CodeGen/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/CIR/MissingFeatures.h 
b/clang/include/clang/CIR/MissingFeatures.h
index 3d3251adae279..5075071661fb5 100644
--- a/clang/include/clang/CIR/MissingFeatures.h
+++ b/clang/include/clang/CIR/MissingFeatures.h
@@ -190,6 +190,10 @@ struct MissingFeatures {
   static bool globalCtorAssociatedData() { return false; }
 
   // Misc
+  static bool aarch64SIMDIntrinsics() { return false; }
+  static bool aarch64SMEIntrinsics() { return false; }
+  static bool aarch64SVEIntrinsics() { return false; }
+  static bool aarch64TblBuiltinExpr() { return false; }
   static bool abiArgInfo() { return false; }
   static bool addAutoInitAnnotation() { return false; }
   static bool addHeapAllocSiteMetadata() { return false; }
@@ -293,6 +297,7 @@ struct MissingFeatures {
   static bool metaDataNode() { return false; }
   static bool moduleNameHash() { return false; }
   static bool msabi() { return false; }
+  static bool neonSISDIntrinsics() { return false; }
   static bool nrvo() { return false; }
   static bool objCBlocks() { return false; }
   static bool objCGC() { return false; }

diff  --git a/clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp 
b/clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
index 12d93cf4c73c6..72495270b11ed 100644
--- a/clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
@@ -1361,9 +1361,13 @@ static mlir::Value 
emitTargetArchBuiltinExpr(CIRGenFunction *cgf,
   case llvm::Triple::armeb:
   case llvm::Triple::thumb:
   case llvm::Triple::thumbeb:
+    // These are actually NYI, but that will be reported by emitBuiltinExpr.
+    // At this point, we don't even know that the builtin is target-specific.
+    return nullptr;
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_32:
   case llvm::Triple::aarch64_be:
+    return cgf->emitAArch64BuiltinExpr(builtinID, e, returnValue, arch);
   case llvm::Triple::bpfeb:
   case llvm::Triple::bpfel:
     // These are actually NYI, but that will be reported by emitBuiltinExpr.

diff  --git a/clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp 
b/clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp
new file mode 100644
index 0000000000000..5a9ae59ca253a
--- /dev/null
+++ b/clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp
@@ -0,0 +1,1583 @@
+//===---- CIRGenBuiltinAArch64.cpp - Emit CIR for AArch64 builtins 
--------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code to emit ARM64 Builtin calls as CIR or a function call
+// to be later resolved.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CIRGenFunction.h"
+#include "clang/CIR/MissingFeatures.h"
+
+// TODO(cir): once all builtins are covered, decide whether we still
+// need to use LLVM intrinsics or if there's a better approach to follow. Right
+// now the intrinsics are reused to make it convenient to encode all thousands
+// of them and passing down to LLVM lowering.
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/IntrinsicsAArch64.h"
+
+#include "mlir/IR/Value.h"
+#include "clang/AST/GlobalDecl.h"
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/TargetBuiltins.h"
+
+using namespace clang;
+using namespace clang::CIRGen;
+using namespace llvm;
+
+mlir::Value CIRGenFunction::emitAArch64SVEBuiltinExpr(unsigned builtinID,
+                                                      const CallExpr *expr) {
+  if (builtinID >= SVE::BI__builtin_sve_reinterpret_s8_s8 &&
+      builtinID <= SVE::BI__builtin_sve_reinterpret_f64_f64_x4) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  assert(!cir::MissingFeatures::aarch64SVEIntrinsics());
+
+  switch (builtinID) {
+  default:
+    return {};
+
+  case SVE::BI__builtin_sve_svreinterpret_b:
+  case SVE::BI__builtin_sve_svreinterpret_c:
+  case SVE::BI__builtin_sve_svpsel_lane_b8:
+  case SVE::BI__builtin_sve_svpsel_lane_b16:
+  case SVE::BI__builtin_sve_svpsel_lane_b32:
+  case SVE::BI__builtin_sve_svpsel_lane_b64:
+  case SVE::BI__builtin_sve_svpsel_lane_c8:
+  case SVE::BI__builtin_sve_svpsel_lane_c16:
+  case SVE::BI__builtin_sve_svpsel_lane_c32:
+  case SVE::BI__builtin_sve_svpsel_lane_c64:
+  case SVE::BI__builtin_sve_svmov_b_z:
+  case SVE::BI__builtin_sve_svnot_b_z:
+  case SVE::BI__builtin_sve_svmovlb_u16:
+  case SVE::BI__builtin_sve_svmovlb_u32:
+  case SVE::BI__builtin_sve_svmovlb_u64:
+  case SVE::BI__builtin_sve_svmovlb_s16:
+  case SVE::BI__builtin_sve_svmovlb_s32:
+  case SVE::BI__builtin_sve_svmovlb_s64:
+  case SVE::BI__builtin_sve_svmovlt_u16:
+  case SVE::BI__builtin_sve_svmovlt_u32:
+  case SVE::BI__builtin_sve_svmovlt_u64:
+  case SVE::BI__builtin_sve_svmovlt_s16:
+  case SVE::BI__builtin_sve_svmovlt_s32:
+  case SVE::BI__builtin_sve_svmovlt_s64:
+  case SVE::BI__builtin_sve_svpmullt_u16:
+  case SVE::BI__builtin_sve_svpmullt_u64:
+  case SVE::BI__builtin_sve_svpmullt_n_u16:
+  case SVE::BI__builtin_sve_svpmullt_n_u64:
+  case SVE::BI__builtin_sve_svpmullb_u16:
+  case SVE::BI__builtin_sve_svpmullb_u64:
+  case SVE::BI__builtin_sve_svpmullb_n_u16:
+  case SVE::BI__builtin_sve_svpmullb_n_u64:
+  case SVE::BI__builtin_sve_svdup_n_b8:
+  case SVE::BI__builtin_sve_svdup_n_b16:
+  case SVE::BI__builtin_sve_svdup_n_b32:
+  case SVE::BI__builtin_sve_svdup_n_b64:
+  case SVE::BI__builtin_sve_svdupq_n_b8:
+  case SVE::BI__builtin_sve_svdupq_n_b16:
+  case SVE::BI__builtin_sve_svdupq_n_b32:
+  case SVE::BI__builtin_sve_svdupq_n_b64:
+  case SVE::BI__builtin_sve_svdupq_n_u8:
+  case SVE::BI__builtin_sve_svdupq_n_s8:
+  case SVE::BI__builtin_sve_svdupq_n_u64:
+  case SVE::BI__builtin_sve_svdupq_n_f64:
+  case SVE::BI__builtin_sve_svdupq_n_s64:
+  case SVE::BI__builtin_sve_svdupq_n_u16:
+  case SVE::BI__builtin_sve_svdupq_n_f16:
+  case SVE::BI__builtin_sve_svdupq_n_bf16:
+  case SVE::BI__builtin_sve_svdupq_n_s16:
+  case SVE::BI__builtin_sve_svdupq_n_u32:
+  case SVE::BI__builtin_sve_svdupq_n_f32:
+  case SVE::BI__builtin_sve_svdupq_n_s32:
+  case SVE::BI__builtin_sve_svpfalse_b:
+  case SVE::BI__builtin_sve_svpfalse_c:
+  case SVE::BI__builtin_sve_svlen_bf16:
+  case SVE::BI__builtin_sve_svlen_f16:
+  case SVE::BI__builtin_sve_svlen_f32:
+  case SVE::BI__builtin_sve_svlen_f64:
+  case SVE::BI__builtin_sve_svlen_s8:
+  case SVE::BI__builtin_sve_svlen_s16:
+  case SVE::BI__builtin_sve_svlen_s32:
+  case SVE::BI__builtin_sve_svlen_s64:
+  case SVE::BI__builtin_sve_svlen_u8:
+  case SVE::BI__builtin_sve_svlen_u16:
+  case SVE::BI__builtin_sve_svlen_u32:
+  case SVE::BI__builtin_sve_svlen_u64:
+  case SVE::BI__builtin_sve_svtbl2_u8:
+  case SVE::BI__builtin_sve_svtbl2_s8:
+  case SVE::BI__builtin_sve_svtbl2_u16:
+  case SVE::BI__builtin_sve_svtbl2_s16:
+  case SVE::BI__builtin_sve_svtbl2_u32:
+  case SVE::BI__builtin_sve_svtbl2_s32:
+  case SVE::BI__builtin_sve_svtbl2_u64:
+  case SVE::BI__builtin_sve_svtbl2_s64:
+  case SVE::BI__builtin_sve_svtbl2_f16:
+  case SVE::BI__builtin_sve_svtbl2_bf16:
+  case SVE::BI__builtin_sve_svtbl2_f32:
+  case SVE::BI__builtin_sve_svtbl2_f64:
+  case SVE::BI__builtin_sve_svset_neonq_s8:
+  case SVE::BI__builtin_sve_svset_neonq_s16:
+  case SVE::BI__builtin_sve_svset_neonq_s32:
+  case SVE::BI__builtin_sve_svset_neonq_s64:
+  case SVE::BI__builtin_sve_svset_neonq_u8:
+  case SVE::BI__builtin_sve_svset_neonq_u16:
+  case SVE::BI__builtin_sve_svset_neonq_u32:
+  case SVE::BI__builtin_sve_svset_neonq_u64:
+  case SVE::BI__builtin_sve_svset_neonq_f16:
+  case SVE::BI__builtin_sve_svset_neonq_f32:
+  case SVE::BI__builtin_sve_svset_neonq_f64:
+  case SVE::BI__builtin_sve_svset_neonq_bf16:
+  case SVE::BI__builtin_sve_svget_neonq_s8:
+  case SVE::BI__builtin_sve_svget_neonq_s16:
+  case SVE::BI__builtin_sve_svget_neonq_s32:
+  case SVE::BI__builtin_sve_svget_neonq_s64:
+  case SVE::BI__builtin_sve_svget_neonq_u8:
+  case SVE::BI__builtin_sve_svget_neonq_u16:
+  case SVE::BI__builtin_sve_svget_neonq_u32:
+  case SVE::BI__builtin_sve_svget_neonq_u64:
+  case SVE::BI__builtin_sve_svget_neonq_f16:
+  case SVE::BI__builtin_sve_svget_neonq_f32:
+  case SVE::BI__builtin_sve_svget_neonq_f64:
+  case SVE::BI__builtin_sve_svget_neonq_bf16:
+  case SVE::BI__builtin_sve_svdup_neonq_s8:
+  case SVE::BI__builtin_sve_svdup_neonq_s16:
+  case SVE::BI__builtin_sve_svdup_neonq_s32:
+  case SVE::BI__builtin_sve_svdup_neonq_s64:
+  case SVE::BI__builtin_sve_svdup_neonq_u8:
+  case SVE::BI__builtin_sve_svdup_neonq_u16:
+  case SVE::BI__builtin_sve_svdup_neonq_u32:
+  case SVE::BI__builtin_sve_svdup_neonq_u64:
+  case SVE::BI__builtin_sve_svdup_neonq_f16:
+  case SVE::BI__builtin_sve_svdup_neonq_f32:
+  case SVE::BI__builtin_sve_svdup_neonq_f64:
+  case SVE::BI__builtin_sve_svdup_neonq_bf16:
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Unreachable: All cases in the switch above return.
+}
+
+mlir::Value CIRGenFunction::emitAArch64SMEBuiltinExpr(unsigned builtinID,
+                                                      const CallExpr *expr) {
+  assert(!cir::MissingFeatures::aarch64SMEIntrinsics());
+
+  cgm.errorNYI(expr->getSourceRange(),
+               std::string("unimplemented AArch64 builtin call: ") +
+                   getContext().BuiltinInfo.getName(builtinID));
+  return {};
+}
+
+// Some intrinsics are equivalent for codegen.
+static const std::pair<unsigned, unsigned> neonEquivalentIntrinsicMap[] = {
+    {
+        NEON::BI__builtin_neon_splat_lane_bf16,
+        NEON::BI__builtin_neon_splat_lane_v,
+    },
+    {
+        NEON::BI__builtin_neon_splat_laneq_bf16,
+        NEON::BI__builtin_neon_splat_laneq_v,
+    },
+    {
+        NEON::BI__builtin_neon_splatq_lane_bf16,
+        NEON::BI__builtin_neon_splatq_lane_v,
+    },
+    {
+        NEON::BI__builtin_neon_splatq_laneq_bf16,
+        NEON::BI__builtin_neon_splatq_laneq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vabd_f16,
+        NEON::BI__builtin_neon_vabd_v,
+    },
+    {
+        NEON::BI__builtin_neon_vabdq_f16,
+        NEON::BI__builtin_neon_vabdq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vabs_f16,
+        NEON::BI__builtin_neon_vabs_v,
+    },
+    {
+        NEON::BI__builtin_neon_vabsq_f16,
+        NEON::BI__builtin_neon_vabsq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcage_f16,
+        NEON::BI__builtin_neon_vcage_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcageq_f16,
+        NEON::BI__builtin_neon_vcageq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcagt_f16,
+        NEON::BI__builtin_neon_vcagt_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcagtq_f16,
+        NEON::BI__builtin_neon_vcagtq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcale_f16,
+        NEON::BI__builtin_neon_vcale_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcaleq_f16,
+        NEON::BI__builtin_neon_vcaleq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcalt_f16,
+        NEON::BI__builtin_neon_vcalt_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcaltq_f16,
+        NEON::BI__builtin_neon_vcaltq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vceqz_f16,
+        NEON::BI__builtin_neon_vceqz_v,
+    },
+    {
+        NEON::BI__builtin_neon_vceqzq_f16,
+        NEON::BI__builtin_neon_vceqzq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcgez_f16,
+        NEON::BI__builtin_neon_vcgez_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcgezq_f16,
+        NEON::BI__builtin_neon_vcgezq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcgtz_f16,
+        NEON::BI__builtin_neon_vcgtz_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcgtzq_f16,
+        NEON::BI__builtin_neon_vcgtzq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vclez_f16,
+        NEON::BI__builtin_neon_vclez_v,
+    },
+    {
+        NEON::BI__builtin_neon_vclezq_f16,
+        NEON::BI__builtin_neon_vclezq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcltz_f16,
+        NEON::BI__builtin_neon_vcltz_v,
+    },
+    {
+        NEON::BI__builtin_neon_vcltzq_f16,
+        NEON::BI__builtin_neon_vcltzq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfma_f16,
+        NEON::BI__builtin_neon_vfma_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfma_lane_f16,
+        NEON::BI__builtin_neon_vfma_lane_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfma_laneq_f16,
+        NEON::BI__builtin_neon_vfma_laneq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfmaq_f16,
+        NEON::BI__builtin_neon_vfmaq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfmaq_lane_f16,
+        NEON::BI__builtin_neon_vfmaq_lane_v,
+    },
+    {
+        NEON::BI__builtin_neon_vfmaq_laneq_f16,
+        NEON::BI__builtin_neon_vfmaq_laneq_v,
+    },
+    {NEON::BI__builtin_neon_vld1_bf16_x2, NEON::BI__builtin_neon_vld1_x2_v},
+    {NEON::BI__builtin_neon_vld1_bf16_x3, NEON::BI__builtin_neon_vld1_x3_v},
+    {NEON::BI__builtin_neon_vld1_bf16_x4, NEON::BI__builtin_neon_vld1_x4_v},
+    {NEON::BI__builtin_neon_vld1_bf16, NEON::BI__builtin_neon_vld1_v},
+    {NEON::BI__builtin_neon_vld1_dup_bf16, NEON::BI__builtin_neon_vld1_dup_v},
+    {NEON::BI__builtin_neon_vld1_lane_bf16, 
NEON::BI__builtin_neon_vld1_lane_v},
+    {NEON::BI__builtin_neon_vld1q_bf16_x2, NEON::BI__builtin_neon_vld1q_x2_v},
+    {NEON::BI__builtin_neon_vld1q_bf16_x3, NEON::BI__builtin_neon_vld1q_x3_v},
+    {NEON::BI__builtin_neon_vld1q_bf16_x4, NEON::BI__builtin_neon_vld1q_x4_v},
+    {NEON::BI__builtin_neon_vld1q_bf16, NEON::BI__builtin_neon_vld1q_v},
+    {NEON::BI__builtin_neon_vld1q_dup_bf16, 
NEON::BI__builtin_neon_vld1q_dup_v},
+    {NEON::BI__builtin_neon_vld1q_lane_bf16,
+     NEON::BI__builtin_neon_vld1q_lane_v},
+    {NEON::BI__builtin_neon_vld2_bf16, NEON::BI__builtin_neon_vld2_v},
+    {NEON::BI__builtin_neon_vld2_dup_bf16, NEON::BI__builtin_neon_vld2_dup_v},
+    {NEON::BI__builtin_neon_vld2_lane_bf16, 
NEON::BI__builtin_neon_vld2_lane_v},
+    {NEON::BI__builtin_neon_vld2q_bf16, NEON::BI__builtin_neon_vld2q_v},
+    {NEON::BI__builtin_neon_vld2q_dup_bf16, 
NEON::BI__builtin_neon_vld2q_dup_v},
+    {NEON::BI__builtin_neon_vld2q_lane_bf16,
+     NEON::BI__builtin_neon_vld2q_lane_v},
+    {NEON::BI__builtin_neon_vld3_bf16, NEON::BI__builtin_neon_vld3_v},
+    {NEON::BI__builtin_neon_vld3_dup_bf16, NEON::BI__builtin_neon_vld3_dup_v},
+    {NEON::BI__builtin_neon_vld3_lane_bf16, 
NEON::BI__builtin_neon_vld3_lane_v},
+    {NEON::BI__builtin_neon_vld3q_bf16, NEON::BI__builtin_neon_vld3q_v},
+    {NEON::BI__builtin_neon_vld3q_dup_bf16, 
NEON::BI__builtin_neon_vld3q_dup_v},
+    {NEON::BI__builtin_neon_vld3q_lane_bf16,
+     NEON::BI__builtin_neon_vld3q_lane_v},
+    {NEON::BI__builtin_neon_vld4_bf16, NEON::BI__builtin_neon_vld4_v},
+    {NEON::BI__builtin_neon_vld4_dup_bf16, NEON::BI__builtin_neon_vld4_dup_v},
+    {NEON::BI__builtin_neon_vld4_lane_bf16, 
NEON::BI__builtin_neon_vld4_lane_v},
+    {NEON::BI__builtin_neon_vld4q_bf16, NEON::BI__builtin_neon_vld4q_v},
+    {NEON::BI__builtin_neon_vld4q_dup_bf16, 
NEON::BI__builtin_neon_vld4q_dup_v},
+    {NEON::BI__builtin_neon_vld4q_lane_bf16,
+     NEON::BI__builtin_neon_vld4q_lane_v},
+    {
+        NEON::BI__builtin_neon_vmax_f16,
+        NEON::BI__builtin_neon_vmax_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmaxnm_f16,
+        NEON::BI__builtin_neon_vmaxnm_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmaxnmq_f16,
+        NEON::BI__builtin_neon_vmaxnmq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmaxq_f16,
+        NEON::BI__builtin_neon_vmaxq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmin_f16,
+        NEON::BI__builtin_neon_vmin_v,
+    },
+    {
+        NEON::BI__builtin_neon_vminnm_f16,
+        NEON::BI__builtin_neon_vminnm_v,
+    },
+    {
+        NEON::BI__builtin_neon_vminnmq_f16,
+        NEON::BI__builtin_neon_vminnmq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vminq_f16,
+        NEON::BI__builtin_neon_vminq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmulx_f16,
+        NEON::BI__builtin_neon_vmulx_v,
+    },
+    {
+        NEON::BI__builtin_neon_vmulxq_f16,
+        NEON::BI__builtin_neon_vmulxq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpadd_f16,
+        NEON::BI__builtin_neon_vpadd_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpaddq_f16,
+        NEON::BI__builtin_neon_vpaddq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpmax_f16,
+        NEON::BI__builtin_neon_vpmax_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpmaxnm_f16,
+        NEON::BI__builtin_neon_vpmaxnm_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpmaxnmq_f16,
+        NEON::BI__builtin_neon_vpmaxnmq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpmaxq_f16,
+        NEON::BI__builtin_neon_vpmaxq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpmin_f16,
+        NEON::BI__builtin_neon_vpmin_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpminnm_f16,
+        NEON::BI__builtin_neon_vpminnm_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpminnmq_f16,
+        NEON::BI__builtin_neon_vpminnmq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vpminq_f16,
+        NEON::BI__builtin_neon_vpminq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrecpe_f16,
+        NEON::BI__builtin_neon_vrecpe_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrecpeq_f16,
+        NEON::BI__builtin_neon_vrecpeq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrecps_f16,
+        NEON::BI__builtin_neon_vrecps_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrecpsq_f16,
+        NEON::BI__builtin_neon_vrecpsq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrnd_f16,
+        NEON::BI__builtin_neon_vrnd_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrnda_f16,
+        NEON::BI__builtin_neon_vrnda_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndaq_f16,
+        NEON::BI__builtin_neon_vrndaq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndi_f16,
+        NEON::BI__builtin_neon_vrndi_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndiq_f16,
+        NEON::BI__builtin_neon_vrndiq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndm_f16,
+        NEON::BI__builtin_neon_vrndm_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndmq_f16,
+        NEON::BI__builtin_neon_vrndmq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndn_f16,
+        NEON::BI__builtin_neon_vrndn_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndnq_f16,
+        NEON::BI__builtin_neon_vrndnq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndp_f16,
+        NEON::BI__builtin_neon_vrndp_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndpq_f16,
+        NEON::BI__builtin_neon_vrndpq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndq_f16,
+        NEON::BI__builtin_neon_vrndq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndx_f16,
+        NEON::BI__builtin_neon_vrndx_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrndxq_f16,
+        NEON::BI__builtin_neon_vrndxq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrsqrte_f16,
+        NEON::BI__builtin_neon_vrsqrte_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrsqrteq_f16,
+        NEON::BI__builtin_neon_vrsqrteq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrsqrts_f16,
+        NEON::BI__builtin_neon_vrsqrts_v,
+    },
+    {
+        NEON::BI__builtin_neon_vrsqrtsq_f16,
+        NEON::BI__builtin_neon_vrsqrtsq_v,
+    },
+    {
+        NEON::BI__builtin_neon_vsqrt_f16,
+        NEON::BI__builtin_neon_vsqrt_v,
+    },
+    {
+        NEON::BI__builtin_neon_vsqrtq_f16,
+        NEON::BI__builtin_neon_vsqrtq_v,
+    },
+    {NEON::BI__builtin_neon_vst1_bf16_x2, NEON::BI__builtin_neon_vst1_x2_v},
+    {NEON::BI__builtin_neon_vst1_bf16_x3, NEON::BI__builtin_neon_vst1_x3_v},
+    {NEON::BI__builtin_neon_vst1_bf16_x4, NEON::BI__builtin_neon_vst1_x4_v},
+    {NEON::BI__builtin_neon_vst1_bf16, NEON::BI__builtin_neon_vst1_v},
+    {NEON::BI__builtin_neon_vst1_lane_bf16, 
NEON::BI__builtin_neon_vst1_lane_v},
+    {NEON::BI__builtin_neon_vst1q_bf16_x2, NEON::BI__builtin_neon_vst1q_x2_v},
+    {NEON::BI__builtin_neon_vst1q_bf16_x3, NEON::BI__builtin_neon_vst1q_x3_v},
+    {NEON::BI__builtin_neon_vst1q_bf16_x4, NEON::BI__builtin_neon_vst1q_x4_v},
+    {NEON::BI__builtin_neon_vst1q_bf16, NEON::BI__builtin_neon_vst1q_v},
+    {NEON::BI__builtin_neon_vst1q_lane_bf16,
+     NEON::BI__builtin_neon_vst1q_lane_v},
+    {NEON::BI__builtin_neon_vst2_bf16, NEON::BI__builtin_neon_vst2_v},
+    {NEON::BI__builtin_neon_vst2_lane_bf16, 
NEON::BI__builtin_neon_vst2_lane_v},
+    {NEON::BI__builtin_neon_vst2q_bf16, NEON::BI__builtin_neon_vst2q_v},
+    {NEON::BI__builtin_neon_vst2q_lane_bf16,
+     NEON::BI__builtin_neon_vst2q_lane_v},
+    {NEON::BI__builtin_neon_vst3_bf16, NEON::BI__builtin_neon_vst3_v},
+    {NEON::BI__builtin_neon_vst3_lane_bf16, 
NEON::BI__builtin_neon_vst3_lane_v},
+    {NEON::BI__builtin_neon_vst3q_bf16, NEON::BI__builtin_neon_vst3q_v},
+    {NEON::BI__builtin_neon_vst3q_lane_bf16,
+     NEON::BI__builtin_neon_vst3q_lane_v},
+    {NEON::BI__builtin_neon_vst4_bf16, NEON::BI__builtin_neon_vst4_v},
+    {NEON::BI__builtin_neon_vst4_lane_bf16, 
NEON::BI__builtin_neon_vst4_lane_v},
+    {NEON::BI__builtin_neon_vst4q_bf16, NEON::BI__builtin_neon_vst4q_v},
+    {NEON::BI__builtin_neon_vst4q_lane_bf16,
+     NEON::BI__builtin_neon_vst4q_lane_v},
+    // The mangling rules cause us to have one ID for each type for
+    // vldap1(q)_lane and vstl1(q)_lane, but codegen is equivalent for all of
+    // them. Choose an arbitrary one to be handled as tha canonical variation.
+    {NEON::BI__builtin_neon_vldap1_lane_u64,
+     NEON::BI__builtin_neon_vldap1_lane_s64},
+    {NEON::BI__builtin_neon_vldap1_lane_f64,
+     NEON::BI__builtin_neon_vldap1_lane_s64},
+    {NEON::BI__builtin_neon_vldap1_lane_p64,
+     NEON::BI__builtin_neon_vldap1_lane_s64},
+    {NEON::BI__builtin_neon_vldap1q_lane_u64,
+     NEON::BI__builtin_neon_vldap1q_lane_s64},
+    {NEON::BI__builtin_neon_vldap1q_lane_f64,
+     NEON::BI__builtin_neon_vldap1q_lane_s64},
+    {NEON::BI__builtin_neon_vldap1q_lane_p64,
+     NEON::BI__builtin_neon_vldap1q_lane_s64},
+    {NEON::BI__builtin_neon_vstl1_lane_u64,
+     NEON::BI__builtin_neon_vstl1_lane_s64},
+    {NEON::BI__builtin_neon_vstl1_lane_f64,
+     NEON::BI__builtin_neon_vstl1_lane_s64},
+    {NEON::BI__builtin_neon_vstl1_lane_p64,
+     NEON::BI__builtin_neon_vstl1_lane_s64},
+    {NEON::BI__builtin_neon_vstl1q_lane_u64,
+     NEON::BI__builtin_neon_vstl1q_lane_s64},
+    {NEON::BI__builtin_neon_vstl1q_lane_f64,
+     NEON::BI__builtin_neon_vstl1q_lane_s64},
+    {NEON::BI__builtin_neon_vstl1q_lane_p64,
+     NEON::BI__builtin_neon_vstl1q_lane_s64},
+};
+
+mlir::Value
+CIRGenFunction::emitAArch64BuiltinExpr(unsigned builtinID, const CallExpr 
*expr,
+                                       ReturnValueSlot returnValue,
+                                       llvm::Triple::ArchType arch) {
+  if (builtinID >= clang::AArch64::FirstSVEBuiltin &&
+      builtinID <= clang::AArch64::LastSVEBuiltin)
+    return emitAArch64SVEBuiltinExpr(builtinID, expr);
+
+  if (builtinID >= clang::AArch64::FirstSMEBuiltin &&
+      builtinID <= clang::AArch64::LastSMEBuiltin)
+    return emitAArch64SMEBuiltinExpr(builtinID, expr);
+
+  if (builtinID == Builtin::BI__builtin_cpu_supports) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  switch (builtinID) {
+  default:
+    break;
+  case clang::AArch64::BI__builtin_arm_nop:
+  case clang::AArch64::BI__builtin_arm_yield:
+  case clang::AArch64::BI__yield:
+  case clang::AArch64::BI__builtin_arm_wfe:
+  case clang::AArch64::BI__wfe:
+  case clang::AArch64::BI__builtin_arm_wfi:
+  case clang::AArch64::BI__wfi:
+  case clang::AArch64::BI__builtin_arm_sev:
+  case clang::AArch64::BI__sev:
+  case clang::AArch64::BI__builtin_arm_sevl:
+  case clang::AArch64::BI__sevl:
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_trap) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_get_sme_state) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rbit) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+  if (builtinID == clang::AArch64::BI__builtin_arm_rbit64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_clz ||
+      builtinID == clang::AArch64::BI__builtin_arm_clz64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_cls) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+  if (builtinID == clang::AArch64::BI__builtin_arm_cls64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rint32zf ||
+      builtinID == clang::AArch64::BI__builtin_arm_rint32z) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rint64zf ||
+      builtinID == clang::AArch64::BI__builtin_arm_rint64z) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rint32xf ||
+      builtinID == clang::AArch64::BI__builtin_arm_rint32x) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rint64xf ||
+      builtinID == clang::AArch64::BI__builtin_arm_rint64x) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_jcvt) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_ld64b ||
+      builtinID == clang::AArch64::BI__builtin_arm_st64b ||
+      builtinID == clang::AArch64::BI__builtin_arm_st64bv ||
+      builtinID == clang::AArch64::BI__builtin_arm_st64bv0) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rndr ||
+      builtinID == clang::AArch64::BI__builtin_arm_rndrrs) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__clear_cache) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if ((builtinID == clang::AArch64::BI__builtin_arm_ldrex ||
+       builtinID == clang::AArch64::BI__builtin_arm_ldaex) &&
+      getContext().getTypeSize(expr->getType()) == 128) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+  if (builtinID == clang::AArch64::BI__builtin_arm_ldrex ||
+      builtinID == clang::AArch64::BI__builtin_arm_ldaex) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if ((builtinID == clang::AArch64::BI__builtin_arm_strex ||
+       builtinID == clang::AArch64::BI__builtin_arm_stlex) &&
+      getContext().getTypeSize(expr->getArg(0)->getType()) == 128) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_strex ||
+      builtinID == clang::AArch64::BI__builtin_arm_stlex) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__getReg) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__break) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_clrex) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI_ReadWriteBarrier) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // CRC32
+  Intrinsic::ID crcIntrinsicID = Intrinsic::not_intrinsic;
+  switch (builtinID) {
+  case clang::AArch64::BI__builtin_arm_crc32b:
+    crcIntrinsicID = Intrinsic::aarch64_crc32b;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32cb:
+    crcIntrinsicID = Intrinsic::aarch64_crc32cb;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32h:
+    crcIntrinsicID = Intrinsic::aarch64_crc32h;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32ch:
+    crcIntrinsicID = Intrinsic::aarch64_crc32ch;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32w:
+    crcIntrinsicID = Intrinsic::aarch64_crc32w;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32cw:
+    crcIntrinsicID = Intrinsic::aarch64_crc32cw;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32d:
+    crcIntrinsicID = Intrinsic::aarch64_crc32x;
+    break;
+  case clang::AArch64::BI__builtin_arm_crc32cd:
+    crcIntrinsicID = Intrinsic::aarch64_crc32cx;
+    break;
+  }
+
+  if (crcIntrinsicID != Intrinsic::not_intrinsic) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Memory Operations (MOPS)
+  if (builtinID == AArch64::BI__builtin_arm_mops_memset_tag) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Memory Tagging Extensions (MTE) Intrinsics
+  Intrinsic::ID mteIntrinsicID = Intrinsic::not_intrinsic;
+  switch (builtinID) {
+  case clang::AArch64::BI__builtin_arm_irg:
+    mteIntrinsicID = Intrinsic::aarch64_irg;
+    break;
+  case clang::AArch64::BI__builtin_arm_addg:
+    mteIntrinsicID = Intrinsic::aarch64_addg;
+    break;
+  case clang::AArch64::BI__builtin_arm_gmi:
+    mteIntrinsicID = Intrinsic::aarch64_gmi;
+    break;
+  case clang::AArch64::BI__builtin_arm_ldg:
+    mteIntrinsicID = Intrinsic::aarch64_ldg;
+    break;
+  case clang::AArch64::BI__builtin_arm_stg:
+    mteIntrinsicID = Intrinsic::aarch64_stg;
+    break;
+  case clang::AArch64::BI__builtin_arm_subp:
+    mteIntrinsicID = Intrinsic::aarch64_subp;
+    break;
+  }
+
+  if (mteIntrinsicID != Intrinsic::not_intrinsic) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_arm_rsr ||
+      builtinID == clang::AArch64::BI__builtin_arm_rsr64 ||
+      builtinID == clang::AArch64::BI__builtin_arm_rsr128 ||
+      builtinID == clang::AArch64::BI__builtin_arm_rsrp ||
+      builtinID == clang::AArch64::BI__builtin_arm_wsr ||
+      builtinID == clang::AArch64::BI__builtin_arm_wsr64 ||
+      builtinID == clang::AArch64::BI__builtin_arm_wsr128 ||
+      builtinID == clang::AArch64::BI__builtin_arm_wsrp) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI_ReadStatusReg ||
+      builtinID == clang::AArch64::BI_WriteStatusReg ||
+      builtinID == clang::AArch64::BI__sys) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI_AddressOfReturnAddress) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__builtin_sponentry) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == clang::AArch64::BI__mulh ||
+      builtinID == clang::AArch64::BI__umulh) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI__writex18byte ||
+      builtinID == AArch64::BI__writex18word ||
+      builtinID == AArch64::BI__writex18dword ||
+      builtinID == AArch64::BI__writex18qword) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI__readx18byte ||
+      builtinID == AArch64::BI__readx18word ||
+      builtinID == AArch64::BI__readx18dword ||
+      builtinID == AArch64::BI__readx18qword) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI__addx18byte ||
+      builtinID == AArch64::BI__addx18word ||
+      builtinID == AArch64::BI__addx18dword ||
+      builtinID == AArch64::BI__addx18qword ||
+      builtinID == AArch64::BI__incx18byte ||
+      builtinID == AArch64::BI__incx18word ||
+      builtinID == AArch64::BI__incx18dword ||
+      builtinID == AArch64::BI__incx18qword) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI_CopyDoubleFromInt64 ||
+      builtinID == AArch64::BI_CopyFloatFromInt32 ||
+      builtinID == AArch64::BI_CopyInt32FromFloat ||
+      builtinID == AArch64::BI_CopyInt64FromDouble) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI_CountLeadingOnes ||
+      builtinID == AArch64::BI_CountLeadingOnes64 ||
+      builtinID == AArch64::BI_CountLeadingZeros ||
+      builtinID == AArch64::BI_CountLeadingZeros64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI_CountLeadingSigns ||
+      builtinID == AArch64::BI_CountLeadingSigns64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI_CountOneBits ||
+      builtinID == AArch64::BI_CountOneBits64) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI__prefetch) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == AArch64::BI__hlt) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  if (builtinID == NEON::BI__builtin_neon_vcvth_bf16_f32) {
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Handle MSVC intrinsics before argument evaluation to prevent double
+  // evaluation.
+  assert(!cir::MissingFeatures::msvcBuiltins());
+
+  // Some intrinsics are equivalent - if they are use the base intrinsic ID.
+  auto it = llvm::find_if(neonEquivalentIntrinsicMap, [builtinID](auto &p) {
+    return p.first == builtinID;
+  });
+  if (it != end(neonEquivalentIntrinsicMap))
+    builtinID = it->second;
+
+  // Find out if any arguments are required to be integer constant
+  // expressions.
+  assert(!cir::MissingFeatures::handleBuiltinICEArguments());
+
+  assert(!cir::MissingFeatures::neonSISDIntrinsics());
+
+  // Handle non-overloaded intrinsics first.
+  switch (builtinID) {
+  default:
+    break;
+  case NEON::BI__builtin_neon_vabsh_f16:
+  case NEON::BI__builtin_neon_vaddq_p128:
+  case NEON::BI__builtin_neon_vldrq_p128:
+  case NEON::BI__builtin_neon_vstrq_p128:
+  case NEON::BI__builtin_neon_vcvts_f32_u32:
+  case NEON::BI__builtin_neon_vcvtd_f64_u64:
+  case NEON::BI__builtin_neon_vcvts_f32_s32:
+  case NEON::BI__builtin_neon_vcvtd_f64_s64:
+  case NEON::BI__builtin_neon_vcvth_f16_u16:
+  case NEON::BI__builtin_neon_vcvth_f16_u32:
+  case NEON::BI__builtin_neon_vcvth_f16_u64:
+  case NEON::BI__builtin_neon_vcvth_f16_s16:
+  case NEON::BI__builtin_neon_vcvth_f16_s32:
+  case NEON::BI__builtin_neon_vcvth_f16_s64:
+  case NEON::BI__builtin_neon_vcvtah_u16_f16:
+  case NEON::BI__builtin_neon_vcvtmh_u16_f16:
+  case NEON::BI__builtin_neon_vcvtnh_u16_f16:
+  case NEON::BI__builtin_neon_vcvtph_u16_f16:
+  case NEON::BI__builtin_neon_vcvth_u16_f16:
+  case NEON::BI__builtin_neon_vcvtah_s16_f16:
+  case NEON::BI__builtin_neon_vcvtmh_s16_f16:
+  case NEON::BI__builtin_neon_vcvtnh_s16_f16:
+  case NEON::BI__builtin_neon_vcvtph_s16_f16:
+  case NEON::BI__builtin_neon_vcvth_s16_f16:
+  case NEON::BI__builtin_neon_vcaleh_f16:
+  case NEON::BI__builtin_neon_vcalth_f16:
+  case NEON::BI__builtin_neon_vcageh_f16:
+  case NEON::BI__builtin_neon_vcagth_f16:
+  case NEON::BI__builtin_neon_vcvth_n_s16_f16:
+  case NEON::BI__builtin_neon_vcvth_n_u16_f16:
+  case NEON::BI__builtin_neon_vcvth_n_f16_s16:
+  case NEON::BI__builtin_neon_vcvth_n_f16_u16:
+  case NEON::BI__builtin_neon_vpaddd_s64:
+  case NEON::BI__builtin_neon_vpaddd_f64:
+  case NEON::BI__builtin_neon_vpadds_f32:
+  case NEON::BI__builtin_neon_vceqzd_s64:
+  case NEON::BI__builtin_neon_vceqzd_f64:
+  case NEON::BI__builtin_neon_vceqzs_f32:
+  case NEON::BI__builtin_neon_vceqzh_f16:
+  case NEON::BI__builtin_neon_vcgezd_s64:
+  case NEON::BI__builtin_neon_vcgezd_f64:
+  case NEON::BI__builtin_neon_vcgezs_f32:
+  case NEON::BI__builtin_neon_vcgezh_f16:
+  case NEON::BI__builtin_neon_vclezd_s64:
+  case NEON::BI__builtin_neon_vclezd_f64:
+  case NEON::BI__builtin_neon_vclezs_f32:
+  case NEON::BI__builtin_neon_vclezh_f16:
+  case NEON::BI__builtin_neon_vcgtzd_s64:
+  case NEON::BI__builtin_neon_vcgtzd_f64:
+  case NEON::BI__builtin_neon_vcgtzs_f32:
+  case NEON::BI__builtin_neon_vcgtzh_f16:
+  case NEON::BI__builtin_neon_vcltzd_s64:
+  case NEON::BI__builtin_neon_vcltzd_f64:
+  case NEON::BI__builtin_neon_vcltzs_f32:
+  case NEON::BI__builtin_neon_vcltzh_f16:
+  case NEON::BI__builtin_neon_vceqzd_u64:
+  case NEON::BI__builtin_neon_vceqd_f64:
+  case NEON::BI__builtin_neon_vcled_f64:
+  case NEON::BI__builtin_neon_vcltd_f64:
+  case NEON::BI__builtin_neon_vcged_f64:
+  case NEON::BI__builtin_neon_vcgtd_f64:
+  case NEON::BI__builtin_neon_vceqs_f32:
+  case NEON::BI__builtin_neon_vcles_f32:
+  case NEON::BI__builtin_neon_vclts_f32:
+  case NEON::BI__builtin_neon_vcges_f32:
+  case NEON::BI__builtin_neon_vcgts_f32:
+  case NEON::BI__builtin_neon_vceqh_f16:
+  case NEON::BI__builtin_neon_vcleh_f16:
+  case NEON::BI__builtin_neon_vclth_f16:
+  case NEON::BI__builtin_neon_vcgeh_f16:
+  case NEON::BI__builtin_neon_vcgth_f16:
+  case NEON::BI__builtin_neon_vceqd_s64:
+  case NEON::BI__builtin_neon_vceqd_u64:
+  case NEON::BI__builtin_neon_vcgtd_s64:
+  case NEON::BI__builtin_neon_vcgtd_u64:
+  case NEON::BI__builtin_neon_vcltd_s64:
+  case NEON::BI__builtin_neon_vcltd_u64:
+  case NEON::BI__builtin_neon_vcged_u64:
+  case NEON::BI__builtin_neon_vcged_s64:
+  case NEON::BI__builtin_neon_vcled_u64:
+  case NEON::BI__builtin_neon_vcled_s64:
+  case NEON::BI__builtin_neon_vtstd_s64:
+  case NEON::BI__builtin_neon_vtstd_u64:
+  case NEON::BI__builtin_neon_vset_lane_i8:
+  case NEON::BI__builtin_neon_vset_lane_i16:
+  case NEON::BI__builtin_neon_vset_lane_i32:
+  case NEON::BI__builtin_neon_vset_lane_i64:
+  case NEON::BI__builtin_neon_vset_lane_bf16:
+  case NEON::BI__builtin_neon_vset_lane_f32:
+  case NEON::BI__builtin_neon_vsetq_lane_i8:
+  case NEON::BI__builtin_neon_vsetq_lane_i16:
+  case NEON::BI__builtin_neon_vsetq_lane_i32:
+  case NEON::BI__builtin_neon_vsetq_lane_i64:
+  case NEON::BI__builtin_neon_vsetq_lane_bf16:
+  case NEON::BI__builtin_neon_vsetq_lane_f32:
+  case NEON::BI__builtin_neon_vset_lane_f64:
+  case NEON::BI__builtin_neon_vset_lane_mf8:
+  case NEON::BI__builtin_neon_vsetq_lane_mf8:
+  case NEON::BI__builtin_neon_vsetq_lane_f64:
+  case NEON::BI__builtin_neon_vget_lane_i8:
+  case NEON::BI__builtin_neon_vdupb_lane_i8:
+  case NEON::BI__builtin_neon_vgetq_lane_i8:
+  case NEON::BI__builtin_neon_vdupb_laneq_i8:
+  case NEON::BI__builtin_neon_vget_lane_mf8:
+  case NEON::BI__builtin_neon_vdupb_lane_mf8:
+  case NEON::BI__builtin_neon_vgetq_lane_mf8:
+  case NEON::BI__builtin_neon_vdupb_laneq_mf8:
+  case NEON::BI__builtin_neon_vget_lane_i16:
+  case NEON::BI__builtin_neon_vduph_lane_i16:
+  case NEON::BI__builtin_neon_vgetq_lane_i16:
+  case NEON::BI__builtin_neon_vduph_laneq_i16:
+  case NEON::BI__builtin_neon_vget_lane_i32:
+  case NEON::BI__builtin_neon_vdups_lane_i32:
+  case NEON::BI__builtin_neon_vdups_lane_f32:
+  case NEON::BI__builtin_neon_vgetq_lane_i32:
+  case NEON::BI__builtin_neon_vdups_laneq_i32:
+  case NEON::BI__builtin_neon_vget_lane_i64:
+  case NEON::BI__builtin_neon_vdupd_lane_i64:
+  case NEON::BI__builtin_neon_vdupd_lane_f64:
+  case NEON::BI__builtin_neon_vgetq_lane_i64:
+  case NEON::BI__builtin_neon_vdupd_laneq_i64:
+  case NEON::BI__builtin_neon_vget_lane_f32:
+  case NEON::BI__builtin_neon_vget_lane_f64:
+  case NEON::BI__builtin_neon_vgetq_lane_f32:
+  case NEON::BI__builtin_neon_vdups_laneq_f32:
+  case NEON::BI__builtin_neon_vgetq_lane_f64:
+  case NEON::BI__builtin_neon_vdupd_laneq_f64:
+  case NEON::BI__builtin_neon_vaddh_f16:
+  case NEON::BI__builtin_neon_vsubh_f16:
+  case NEON::BI__builtin_neon_vmulh_f16:
+  case NEON::BI__builtin_neon_vdivh_f16:
+  case NEON::BI__builtin_neon_vfmah_f16:
+  case NEON::BI__builtin_neon_vfmsh_f16:
+  case NEON::BI__builtin_neon_vaddd_s64:
+  case NEON::BI__builtin_neon_vaddd_u64:
+  case NEON::BI__builtin_neon_vsubd_s64:
+  case NEON::BI__builtin_neon_vsubd_u64:
+  case NEON::BI__builtin_neon_vqdmlalh_s16:
+  case NEON::BI__builtin_neon_vqdmlslh_s16:
+  case NEON::BI__builtin_neon_vqshlud_n_s64:
+  case NEON::BI__builtin_neon_vqshld_n_u64:
+  case NEON::BI__builtin_neon_vqshld_n_s64:
+  case NEON::BI__builtin_neon_vrshrd_n_u64:
+  case NEON::BI__builtin_neon_vrshrd_n_s64:
+  case NEON::BI__builtin_neon_vrsrad_n_u64:
+  case NEON::BI__builtin_neon_vrsrad_n_s64:
+  case NEON::BI__builtin_neon_vshld_n_s64:
+  case NEON::BI__builtin_neon_vshld_n_u64:
+  case NEON::BI__builtin_neon_vshrd_n_s64:
+  case NEON::BI__builtin_neon_vshrd_n_u64:
+  case NEON::BI__builtin_neon_vsrad_n_s64:
+  case NEON::BI__builtin_neon_vsrad_n_u64:
+  case NEON::BI__builtin_neon_vqdmlalh_lane_s16:
+  case NEON::BI__builtin_neon_vqdmlalh_laneq_s16:
+  case NEON::BI__builtin_neon_vqdmlslh_lane_s16:
+  case NEON::BI__builtin_neon_vqdmlslh_laneq_s16:
+  case NEON::BI__builtin_neon_vqdmlals_s32:
+  case NEON::BI__builtin_neon_vqdmlsls_s32:
+  case NEON::BI__builtin_neon_vqdmlals_lane_s32:
+  case NEON::BI__builtin_neon_vqdmlals_laneq_s32:
+  case NEON::BI__builtin_neon_vqdmlsls_lane_s32:
+  case NEON::BI__builtin_neon_vqdmlsls_laneq_s32:
+  case NEON::BI__builtin_neon_vget_lane_bf16:
+  case NEON::BI__builtin_neon_vduph_lane_bf16:
+  case NEON::BI__builtin_neon_vduph_lane_f16:
+  case NEON::BI__builtin_neon_vgetq_lane_bf16:
+  case NEON::BI__builtin_neon_vduph_laneq_bf16:
+  case NEON::BI__builtin_neon_vduph_laneq_f16:
+  case NEON::BI__builtin_neon_vcvt_bf16_f32:
+  case NEON::BI__builtin_neon_vcvtq_low_bf16_f32:
+  case NEON::BI__builtin_neon_vcvtq_high_bf16_f32:
+  case clang::AArch64::BI_InterlockedAdd:
+  case clang::AArch64::BI_InterlockedAdd_acq:
+  case clang::AArch64::BI_InterlockedAdd_rel:
+  case clang::AArch64::BI_InterlockedAdd_nf:
+  case clang::AArch64::BI_InterlockedAdd64:
+  case clang::AArch64::BI_InterlockedAdd64_acq:
+  case clang::AArch64::BI_InterlockedAdd64_rel:
+  case clang::AArch64::BI_InterlockedAdd64_nf:
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Not all intrinsics handled by the common case work for AArch64 yet, so 
only
+  // defer to common code if it's been added to our special map.
+  assert(!cir::MissingFeatures::aarch64SIMDIntrinsics());
+
+  assert(!cir::MissingFeatures::aarch64TblBuiltinExpr());
+
+  switch (builtinID) {
+  default:
+    return {};
+  case NEON::BI__builtin_neon_vbsl_v:
+  case NEON::BI__builtin_neon_vbslq_v:
+  case NEON::BI__builtin_neon_vfma_lane_v:
+  case NEON::BI__builtin_neon_vfmaq_lane_v:
+  case NEON::BI__builtin_neon_vfma_laneq_v:
+  case NEON::BI__builtin_neon_vfmaq_laneq_v:
+  case NEON::BI__builtin_neon_vfmah_lane_f16:
+  case NEON::BI__builtin_neon_vfmas_lane_f32:
+  case NEON::BI__builtin_neon_vfmah_laneq_f16:
+  case NEON::BI__builtin_neon_vfmas_laneq_f32:
+  case NEON::BI__builtin_neon_vfmad_lane_f64:
+  case NEON::BI__builtin_neon_vfmad_laneq_f64:
+  case NEON::BI__builtin_neon_vmull_v:
+  case NEON::BI__builtin_neon_vmax_v:
+  case NEON::BI__builtin_neon_vmaxq_v:
+  case NEON::BI__builtin_neon_vmaxh_f16:
+  case NEON::BI__builtin_neon_vmin_v:
+  case NEON::BI__builtin_neon_vminq_v:
+  case NEON::BI__builtin_neon_vminh_f16:
+  case NEON::BI__builtin_neon_vabd_v:
+  case NEON::BI__builtin_neon_vabdq_v:
+  case NEON::BI__builtin_neon_vpadal_v:
+  case NEON::BI__builtin_neon_vpadalq_v:
+  case NEON::BI__builtin_neon_vpmin_v:
+  case NEON::BI__builtin_neon_vpminq_v:
+  case NEON::BI__builtin_neon_vpmax_v:
+  case NEON::BI__builtin_neon_vpmaxq_v:
+  case NEON::BI__builtin_neon_vminnm_v:
+  case NEON::BI__builtin_neon_vminnmq_v:
+  case NEON::BI__builtin_neon_vminnmh_f16:
+  case NEON::BI__builtin_neon_vmaxnm_v:
+  case NEON::BI__builtin_neon_vmaxnmq_v:
+  case NEON::BI__builtin_neon_vmaxnmh_f16:
+  case NEON::BI__builtin_neon_vrecpss_f32:
+  case NEON::BI__builtin_neon_vrecpsd_f64:
+  case NEON::BI__builtin_neon_vrecpsh_f16:
+  case NEON::BI__builtin_neon_vqshrun_n_v:
+  case NEON::BI__builtin_neon_vqrshrun_n_v:
+  case NEON::BI__builtin_neon_vqshrn_n_v:
+  case NEON::BI__builtin_neon_vrshrn_n_v:
+  case NEON::BI__builtin_neon_vqrshrn_n_v:
+  case NEON::BI__builtin_neon_vrndah_f16:
+  case NEON::BI__builtin_neon_vrnda_v:
+  case NEON::BI__builtin_neon_vrndaq_v:
+  case NEON::BI__builtin_neon_vrndih_f16:
+  case NEON::BI__builtin_neon_vrndmh_f16:
+  case NEON::BI__builtin_neon_vrndm_v:
+  case NEON::BI__builtin_neon_vrndmq_v:
+  case NEON::BI__builtin_neon_vrndnh_f16:
+  case NEON::BI__builtin_neon_vrndn_v:
+  case NEON::BI__builtin_neon_vrndnq_v:
+  case NEON::BI__builtin_neon_vrndns_f32:
+  case NEON::BI__builtin_neon_vrndph_f16:
+  case NEON::BI__builtin_neon_vrndp_v:
+  case NEON::BI__builtin_neon_vrndpq_v:
+  case NEON::BI__builtin_neon_vrndxh_f16:
+  case NEON::BI__builtin_neon_vrndx_v:
+  case NEON::BI__builtin_neon_vrndxq_v:
+  case NEON::BI__builtin_neon_vrndh_f16:
+  case NEON::BI__builtin_neon_vrnd32x_f32:
+  case NEON::BI__builtin_neon_vrnd32xq_f32:
+  case NEON::BI__builtin_neon_vrnd32x_f64:
+  case NEON::BI__builtin_neon_vrnd32xq_f64:
+  case NEON::BI__builtin_neon_vrnd32z_f32:
+  case NEON::BI__builtin_neon_vrnd32zq_f32:
+  case NEON::BI__builtin_neon_vrnd32z_f64:
+  case NEON::BI__builtin_neon_vrnd32zq_f64:
+  case NEON::BI__builtin_neon_vrnd64x_f32:
+  case NEON::BI__builtin_neon_vrnd64xq_f32:
+  case NEON::BI__builtin_neon_vrnd64x_f64:
+  case NEON::BI__builtin_neon_vrnd64xq_f64:
+  case NEON::BI__builtin_neon_vrnd64z_f32:
+  case NEON::BI__builtin_neon_vrnd64zq_f32:
+  case NEON::BI__builtin_neon_vrnd64z_f64:
+  case NEON::BI__builtin_neon_vrnd64zq_f64:
+  case NEON::BI__builtin_neon_vrnd_v:
+  case NEON::BI__builtin_neon_vrndq_v:
+  case NEON::BI__builtin_neon_vcvt_f64_v:
+  case NEON::BI__builtin_neon_vcvtq_f64_v:
+  case NEON::BI__builtin_neon_vcvt_f64_f32:
+  case NEON::BI__builtin_neon_vcvt_f32_f64:
+  case NEON::BI__builtin_neon_vcvt_s32_v:
+  case NEON::BI__builtin_neon_vcvt_u32_v:
+  case NEON::BI__builtin_neon_vcvt_s64_v:
+  case NEON::BI__builtin_neon_vcvt_u64_v:
+  case NEON::BI__builtin_neon_vcvt_s16_f16:
+  case NEON::BI__builtin_neon_vcvt_u16_f16:
+  case NEON::BI__builtin_neon_vcvtq_s32_v:
+  case NEON::BI__builtin_neon_vcvtq_u32_v:
+  case NEON::BI__builtin_neon_vcvtq_s64_v:
+  case NEON::BI__builtin_neon_vcvtq_u64_v:
+  case NEON::BI__builtin_neon_vcvtq_s16_f16:
+  case NEON::BI__builtin_neon_vcvtq_u16_f16:
+  case NEON::BI__builtin_neon_vcvta_s16_f16:
+  case NEON::BI__builtin_neon_vcvta_u16_f16:
+  case NEON::BI__builtin_neon_vcvta_s32_v:
+  case NEON::BI__builtin_neon_vcvtaq_s16_f16:
+  case NEON::BI__builtin_neon_vcvtaq_s32_v:
+  case NEON::BI__builtin_neon_vcvta_u32_v:
+  case NEON::BI__builtin_neon_vcvtaq_u16_f16:
+  case NEON::BI__builtin_neon_vcvtaq_u32_v:
+  case NEON::BI__builtin_neon_vcvta_s64_v:
+  case NEON::BI__builtin_neon_vcvtaq_s64_v:
+  case NEON::BI__builtin_neon_vcvta_u64_v:
+  case NEON::BI__builtin_neon_vcvtaq_u64_v:
+  case NEON::BI__builtin_neon_vcvtm_s16_f16:
+  case NEON::BI__builtin_neon_vcvtm_s32_v:
+  case NEON::BI__builtin_neon_vcvtmq_s16_f16:
+  case NEON::BI__builtin_neon_vcvtmq_s32_v:
+  case NEON::BI__builtin_neon_vcvtm_u16_f16:
+  case NEON::BI__builtin_neon_vcvtm_u32_v:
+  case NEON::BI__builtin_neon_vcvtmq_u16_f16:
+  case NEON::BI__builtin_neon_vcvtmq_u32_v:
+  case NEON::BI__builtin_neon_vcvtm_s64_v:
+  case NEON::BI__builtin_neon_vcvtmq_s64_v:
+  case NEON::BI__builtin_neon_vcvtm_u64_v:
+  case NEON::BI__builtin_neon_vcvtmq_u64_v:
+  case NEON::BI__builtin_neon_vcvtn_s16_f16:
+  case NEON::BI__builtin_neon_vcvtn_s32_v:
+  case NEON::BI__builtin_neon_vcvtnq_s16_f16:
+  case NEON::BI__builtin_neon_vcvtnq_s32_v:
+  case NEON::BI__builtin_neon_vcvtn_u16_f16:
+  case NEON::BI__builtin_neon_vcvtn_u32_v:
+  case NEON::BI__builtin_neon_vcvtnq_u16_f16:
+  case NEON::BI__builtin_neon_vcvtnq_u32_v:
+  case NEON::BI__builtin_neon_vcvtn_s64_v:
+  case NEON::BI__builtin_neon_vcvtnq_s64_v:
+  case NEON::BI__builtin_neon_vcvtn_u64_v:
+  case NEON::BI__builtin_neon_vcvtnq_u64_v:
+  case NEON::BI__builtin_neon_vcvtp_s16_f16:
+  case NEON::BI__builtin_neon_vcvtp_s32_v:
+  case NEON::BI__builtin_neon_vcvtpq_s16_f16:
+  case NEON::BI__builtin_neon_vcvtpq_s32_v:
+  case NEON::BI__builtin_neon_vcvtp_u16_f16:
+  case NEON::BI__builtin_neon_vcvtp_u32_v:
+  case NEON::BI__builtin_neon_vcvtpq_u16_f16:
+  case NEON::BI__builtin_neon_vcvtpq_u32_v:
+  case NEON::BI__builtin_neon_vcvtp_s64_v:
+  case NEON::BI__builtin_neon_vcvtpq_s64_v:
+  case NEON::BI__builtin_neon_vcvtp_u64_v:
+  case NEON::BI__builtin_neon_vcvtpq_u64_v:
+  case NEON::BI__builtin_neon_vmulx_v:
+  case NEON::BI__builtin_neon_vmulxq_v:
+  case NEON::BI__builtin_neon_vmulxh_lane_f16:
+  case NEON::BI__builtin_neon_vmulxh_laneq_f16:
+  case NEON::BI__builtin_neon_vmul_lane_v:
+  case NEON::BI__builtin_neon_vmul_laneq_v:
+  case NEON::BI__builtin_neon_vnegd_s64:
+  case NEON::BI__builtin_neon_vnegh_f16:
+  case NEON::BI__builtin_neon_vpmaxnm_v:
+  case NEON::BI__builtin_neon_vpmaxnmq_v:
+  case NEON::BI__builtin_neon_vpminnm_v:
+  case NEON::BI__builtin_neon_vpminnmq_v:
+  case NEON::BI__builtin_neon_vsqrth_f16:
+  case NEON::BI__builtin_neon_vsqrt_v:
+  case NEON::BI__builtin_neon_vsqrtq_v:
+  case NEON::BI__builtin_neon_vrbit_v:
+  case NEON::BI__builtin_neon_vrbitq_v:
+  case NEON::BI__builtin_neon_vmaxv_f16:
+  case NEON::BI__builtin_neon_vmaxvq_f16:
+  case NEON::BI__builtin_neon_vminv_f16:
+  case NEON::BI__builtin_neon_vminvq_f16:
+  case NEON::BI__builtin_neon_vmaxnmv_f16:
+  case NEON::BI__builtin_neon_vmaxnmvq_f16:
+  case NEON::BI__builtin_neon_vminnmv_f16:
+  case NEON::BI__builtin_neon_vminnmvq_f16:
+  case NEON::BI__builtin_neon_vmul_n_f64:
+  case NEON::BI__builtin_neon_vaddlv_u8:
+  case NEON::BI__builtin_neon_vaddlv_u16:
+  case NEON::BI__builtin_neon_vaddlvq_u8:
+  case NEON::BI__builtin_neon_vaddlvq_u16:
+  case NEON::BI__builtin_neon_vaddlv_s8:
+  case NEON::BI__builtin_neon_vaddlv_s16:
+  case NEON::BI__builtin_neon_vaddlvq_s8:
+  case NEON::BI__builtin_neon_vaddlvq_s16:
+  case NEON::BI__builtin_neon_vsri_n_v:
+  case NEON::BI__builtin_neon_vsriq_n_v:
+  case NEON::BI__builtin_neon_vsli_n_v:
+  case NEON::BI__builtin_neon_vsliq_n_v:
+  case NEON::BI__builtin_neon_vsra_n_v:
+  case NEON::BI__builtin_neon_vsraq_n_v:
+  case NEON::BI__builtin_neon_vrsra_n_v:
+  case NEON::BI__builtin_neon_vrsraq_n_v:
+  case NEON::BI__builtin_neon_vld1_v:
+  case NEON::BI__builtin_neon_vld1q_v:
+  case NEON::BI__builtin_neon_vst1_v:
+  case NEON::BI__builtin_neon_vst1q_v:
+  case NEON::BI__builtin_neon_vld1_lane_v:
+  case NEON::BI__builtin_neon_vld1q_lane_v:
+  case NEON::BI__builtin_neon_vldap1_lane_s64:
+  case NEON::BI__builtin_neon_vldap1q_lane_s64:
+  case NEON::BI__builtin_neon_vld1_dup_v:
+  case NEON::BI__builtin_neon_vld1q_dup_v:
+  case NEON::BI__builtin_neon_vst1_lane_v:
+  case NEON::BI__builtin_neon_vst1q_lane_v:
+  case NEON::BI__builtin_neon_vstl1_lane_s64:
+  case NEON::BI__builtin_neon_vstl1q_lane_s64:
+  case NEON::BI__builtin_neon_vld2_v:
+  case NEON::BI__builtin_neon_vld2q_v:
+  case NEON::BI__builtin_neon_vld3_v:
+  case NEON::BI__builtin_neon_vld3q_v:
+  case NEON::BI__builtin_neon_vld4_v:
+  case NEON::BI__builtin_neon_vld4q_v:
+  case NEON::BI__builtin_neon_vld2_dup_v:
+  case NEON::BI__builtin_neon_vld2q_dup_v:
+  case NEON::BI__builtin_neon_vld3_dup_v:
+  case NEON::BI__builtin_neon_vld3q_dup_v:
+  case NEON::BI__builtin_neon_vld4_dup_v:
+  case NEON::BI__builtin_neon_vld4q_dup_v:
+  case NEON::BI__builtin_neon_vld2_lane_v:
+  case NEON::BI__builtin_neon_vld2q_lane_v:
+  case NEON::BI__builtin_neon_vld3_lane_v:
+  case NEON::BI__builtin_neon_vld3q_lane_v:
+  case NEON::BI__builtin_neon_vld4_lane_v:
+  case NEON::BI__builtin_neon_vld4q_lane_v:
+  case NEON::BI__builtin_neon_vst2_v:
+  case NEON::BI__builtin_neon_vst2q_v:
+  case NEON::BI__builtin_neon_vst2_lane_v:
+  case NEON::BI__builtin_neon_vst2q_lane_v:
+  case NEON::BI__builtin_neon_vst3_v:
+  case NEON::BI__builtin_neon_vst3q_v:
+  case NEON::BI__builtin_neon_vst3_lane_v:
+  case NEON::BI__builtin_neon_vst3q_lane_v:
+  case NEON::BI__builtin_neon_vst4_v:
+  case NEON::BI__builtin_neon_vst4q_v:
+  case NEON::BI__builtin_neon_vst4_lane_v:
+  case NEON::BI__builtin_neon_vst4q_lane_v:
+  case NEON::BI__builtin_neon_vtrn_v:
+  case NEON::BI__builtin_neon_vtrnq_v:
+  case NEON::BI__builtin_neon_vuzp_v:
+  case NEON::BI__builtin_neon_vuzpq_v:
+  case NEON::BI__builtin_neon_vzip_v:
+  case NEON::BI__builtin_neon_vzipq_v:
+  case NEON::BI__builtin_neon_vqtbl1q_v:
+  case NEON::BI__builtin_neon_vqtbl2q_v:
+  case NEON::BI__builtin_neon_vqtbl3q_v:
+  case NEON::BI__builtin_neon_vqtbl4q_v:
+  case NEON::BI__builtin_neon_vqtbx1q_v:
+  case NEON::BI__builtin_neon_vqtbx2q_v:
+  case NEON::BI__builtin_neon_vqtbx3q_v:
+  case NEON::BI__builtin_neon_vqtbx4q_v:
+  case NEON::BI__builtin_neon_vsqadd_v:
+  case NEON::BI__builtin_neon_vsqaddq_v:
+  case NEON::BI__builtin_neon_vuqadd_v:
+  case NEON::BI__builtin_neon_vuqaddq_v:
+  case NEON::BI__builtin_neon_vluti2_laneq_mf8:
+  case NEON::BI__builtin_neon_vluti2_laneq_bf16:
+  case NEON::BI__builtin_neon_vluti2_laneq_f16:
+  case NEON::BI__builtin_neon_vluti2_laneq_p16:
+  case NEON::BI__builtin_neon_vluti2_laneq_p8:
+  case NEON::BI__builtin_neon_vluti2_laneq_s16:
+  case NEON::BI__builtin_neon_vluti2_laneq_s8:
+  case NEON::BI__builtin_neon_vluti2_laneq_u16:
+  case NEON::BI__builtin_neon_vluti2_laneq_u8:
+  case NEON::BI__builtin_neon_vluti2q_laneq_mf8:
+  case NEON::BI__builtin_neon_vluti2q_laneq_bf16:
+  case NEON::BI__builtin_neon_vluti2q_laneq_f16:
+  case NEON::BI__builtin_neon_vluti2q_laneq_p16:
+  case NEON::BI__builtin_neon_vluti2q_laneq_p8:
+  case NEON::BI__builtin_neon_vluti2q_laneq_s16:
+  case NEON::BI__builtin_neon_vluti2q_laneq_s8:
+  case NEON::BI__builtin_neon_vluti2q_laneq_u16:
+  case NEON::BI__builtin_neon_vluti2q_laneq_u8:
+  case NEON::BI__builtin_neon_vluti2_lane_mf8:
+  case NEON::BI__builtin_neon_vluti2_lane_bf16:
+  case NEON::BI__builtin_neon_vluti2_lane_f16:
+  case NEON::BI__builtin_neon_vluti2_lane_p16:
+  case NEON::BI__builtin_neon_vluti2_lane_p8:
+  case NEON::BI__builtin_neon_vluti2_lane_s16:
+  case NEON::BI__builtin_neon_vluti2_lane_s8:
+  case NEON::BI__builtin_neon_vluti2_lane_u16:
+  case NEON::BI__builtin_neon_vluti2_lane_u8:
+  case NEON::BI__builtin_neon_vluti2q_lane_mf8:
+  case NEON::BI__builtin_neon_vluti2q_lane_bf16:
+  case NEON::BI__builtin_neon_vluti2q_lane_f16:
+  case NEON::BI__builtin_neon_vluti2q_lane_p16:
+  case NEON::BI__builtin_neon_vluti2q_lane_p8:
+  case NEON::BI__builtin_neon_vluti2q_lane_s16:
+  case NEON::BI__builtin_neon_vluti2q_lane_s8:
+  case NEON::BI__builtin_neon_vluti2q_lane_u16:
+  case NEON::BI__builtin_neon_vluti2q_lane_u8:
+  case NEON::BI__builtin_neon_vluti4q_lane_mf8:
+  case NEON::BI__builtin_neon_vluti4q_lane_p8:
+  case NEON::BI__builtin_neon_vluti4q_lane_s8:
+  case NEON::BI__builtin_neon_vluti4q_lane_u8:
+  case NEON::BI__builtin_neon_vluti4q_laneq_mf8:
+  case NEON::BI__builtin_neon_vluti4q_laneq_p8:
+  case NEON::BI__builtin_neon_vluti4q_laneq_s8:
+  case NEON::BI__builtin_neon_vluti4q_laneq_u8:
+  case NEON::BI__builtin_neon_vluti4q_lane_bf16_x2:
+  case NEON::BI__builtin_neon_vluti4q_lane_f16_x2:
+  case NEON::BI__builtin_neon_vluti4q_lane_p16_x2:
+  case NEON::BI__builtin_neon_vluti4q_lane_s16_x2:
+  case NEON::BI__builtin_neon_vluti4q_lane_u16_x2:
+  case NEON::BI__builtin_neon_vluti4q_laneq_bf16_x2:
+  case NEON::BI__builtin_neon_vluti4q_laneq_f16_x2:
+  case NEON::BI__builtin_neon_vluti4q_laneq_p16_x2:
+  case NEON::BI__builtin_neon_vluti4q_laneq_s16_x2:
+  case NEON::BI__builtin_neon_vluti4q_laneq_u16_x2:
+  case NEON::BI__builtin_neon_vmmlaq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmmlaq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_low_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_high_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_low_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_high_bf16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_low_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt1_high_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_low_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt2_high_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vcvt_mf8_f32_fpm:
+  case NEON::BI__builtin_neon_vcvt_mf8_f16_fpm:
+  case NEON::BI__builtin_neon_vcvtq_mf8_f16_fpm:
+  case NEON::BI__builtin_neon_vcvt_high_mf8_f32_fpm:
+  case NEON::BI__builtin_neon_vdot_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdot_lane_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_lane_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdot_laneq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_laneq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vdot_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vdot_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vdot_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vdotq_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalbq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlaltq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbbq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbtq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalltbq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallttq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalbq_lane_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalbq_laneq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlaltq_lane_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlaltq_laneq_f16_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbbq_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbbq_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbtq_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallbtq_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalltbq_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlalltbq_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallttq_lane_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vmlallttq_laneq_f32_mf8_fpm:
+  case NEON::BI__builtin_neon_vamin_f16:
+  case NEON::BI__builtin_neon_vaminq_f16:
+  case NEON::BI__builtin_neon_vamin_f32:
+  case NEON::BI__builtin_neon_vaminq_f32:
+  case NEON::BI__builtin_neon_vaminq_f64:
+  case NEON::BI__builtin_neon_vamax_f16:
+  case NEON::BI__builtin_neon_vamaxq_f16:
+  case NEON::BI__builtin_neon_vamax_f32:
+  case NEON::BI__builtin_neon_vamaxq_f32:
+  case NEON::BI__builtin_neon_vamaxq_f64:
+  case NEON::BI__builtin_neon_vscale_f16:
+  case NEON::BI__builtin_neon_vscaleq_f16:
+  case NEON::BI__builtin_neon_vscale_f32:
+  case NEON::BI__builtin_neon_vscaleq_f32:
+  case NEON::BI__builtin_neon_vscaleq_f64:
+    cgm.errorNYI(expr->getSourceRange(),
+                 std::string("unimplemented AArch64 builtin call: ") +
+                     getContext().BuiltinInfo.getName(builtinID));
+    return {};
+  }
+
+  // Unreachable: All cases in the switch above return.
+}

diff  --git a/clang/lib/CIR/CodeGen/CIRGenFunction.h 
b/clang/lib/CIR/CodeGen/CIRGenFunction.h
index ada16ff187430..91b5ffa8b9ff9 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.h
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.h
@@ -1236,6 +1236,14 @@ class CIRGenFunction : public CIRGenTypeCache {
   /// CIR emit functions
   /// ----------------------
 public:
+  mlir::Value emitAArch64BuiltinExpr(unsigned builtinID, const CallExpr *expr,
+                                     ReturnValueSlot returnValue,
+                                     llvm::Triple::ArchType arch);
+  mlir::Value emitAArch64SMEBuiltinExpr(unsigned builtinID,
+                                        const CallExpr *expr);
+  mlir::Value emitAArch64SVEBuiltinExpr(unsigned builtinID,
+                                        const CallExpr *expr);
+
   mlir::Value emitAlignmentAssumption(mlir::Value ptrValue, QualType ty,
                                       SourceLocation loc,
                                       SourceLocation assumptionLoc,

diff  --git a/clang/lib/CIR/CodeGen/CMakeLists.txt 
b/clang/lib/CIR/CodeGen/CMakeLists.txt
index d3e2290ceea0b..d6cd15039a9bc 100644
--- a/clang/lib/CIR/CodeGen/CMakeLists.txt
+++ b/clang/lib/CIR/CodeGen/CMakeLists.txt
@@ -12,6 +12,7 @@ add_clang_library(clangCIR
   CIRGenAtomic.cpp
   CIRGenBuilder.cpp
   CIRGenBuiltin.cpp
+  CIRGenBuiltinAArch64.cpp
   CIRGenBuiltinX86.cpp
   CIRGenCall.cpp
   CIRGenClass.cpp


        
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