Add quantized embedding kernels to torchao (pytorch#1018)

Summary:
Pull Request resolved: pytorch#1018

This diff adds lowbit embedding kernels to torchao.  These reuse the same bitpacking code as the linear kernels.

Differential Revision: D63839255

Author: metascroy

torchao/experimental/kernels/cpu/aarch64/bitpacking/bitpack.h

@@ -9,13 +9,13 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint1.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint2.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint3.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint4.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint5.h>
 #include <torchao/experimental/kernels/cpu/aarch64/bitpacking/uint6.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 #include <cassert>
 
 namespace torchao {
@@ -142,7 +142,7 @@ TORCHAO_ALWAYS_INLINE inline void vec_pack_32_lowbit_values(
       break;
     case 6:
       torchao::bitpacking::internal::vec_pack_32_uint6_values(
-        packed, shifted0, shifted1);
+          packed, shifted0, shifted1);
       break;
     default:
       assert(false);
@@ -153,7 +153,7 @@ template <int nbit>
 TORCHAO_ALWAYS_INLINE inline void vec_unpack_32_lowbit_values(
     int8x16_t& unpacked0,
     int8x16_t& unpacked1,
-    uint8_t* packed) {
+    const uint8_t* packed) {
   static_assert(nbit < 8);
   static_assert(nbit >= 1);
 
@@ -217,7 +217,7 @@ TORCHAO_ALWAYS_INLINE inline void vec_unpack_32_lowbit_values(
       break;
     case 6:
       torchao::bitpacking::internal::vec_unpack_32_uint6_values(
-        shifted0, shifted1, packed);
+          shifted0, shifted1, packed);
       break;
     default:
       assert(false);
@@ -288,7 +288,7 @@ TORCHAO_ALWAYS_INLINE inline void vec_unpack_64_lowbit_values(
     int8x16_t& unpacked1,
     int8x16_t& unpacked2,
     int8x16_t& unpacked3,
-    uint8_t* packed) {
+    const uint8_t* packed) {
   static_assert(nbit < 8);
   static_assert(nbit >= 1);
 
@@ -443,7 +443,7 @@ TORCHAO_ALWAYS_INLINE inline void vec_unpack_128_lowbit_values(
     int8x16_t& unpacked5,
     int8x16_t& unpacked6,
     int8x16_t& unpacked7,
-    uint8_t* packed) {
+    const uint8_t* packed) {
   static_assert(nbit < 8);
   static_assert(nbit >= 1);
 

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint1.h

@@ -8,7 +8,7 @@
 
 #if defined(__aarch64__) || defined(__ARM_NEON)
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint1.
 // These are not inteded to be used outside of bitpacking directory.

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint2.h

@@ -9,7 +9,7 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint4.
 // These are not inteded to be used outside of bitpacking directory.

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint3.h

@@ -9,7 +9,7 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint3.
 // These are not inteded to be used outside of bitpacking directory.

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint4.h

@@ -9,7 +9,7 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint4.
 // These are not inteded to be used outside of bitpacking directory.

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint5.h

@@ -9,7 +9,7 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint5.
 // These are not inteded to be used outside of bitpacking directory.

torchao/experimental/kernels/cpu/aarch64/bitpacking/uint6.h

@@ -9,7 +9,7 @@
 #if defined(__aarch64__) || defined(__ARM_NEON)
 
 #include <arm_neon.h>
-#include <torchao/experimental/kernels/cpu/aarch64/bitpacking/macro.h>
+#include <torchao/experimental/kernels/cpu/aarch64/macro.h>
 
 // This file contains bitpacking and unpacking methods for uint5.
 // These are not inteded to be used outside of bitpacking directory.