Enable SVE Support for L2 Metric Computation in FP32

Signed-off-by:Adarsh Srivastava <[email protected]>

cmake/libs/libfaiss.cmake

@@ -47,9 +47,18 @@ if(__X86_64)
 endif()
 
 if(__AARCH64)
-  set(UTILS_SRC src/simd/hook.cc src/simd/distances_ref.cc
-                src/simd/distances_neon.cc)
-  add_library(knowhere_utils STATIC ${UTILS_SRC})
+  set(UTILS_SRC src/simd/hook.cc src/simd/distances_ref.cc)
+
+  # Add separate utils for NEON and SVE
+  add_library(utils_neon OBJECT src/simd/distances_neon.cc)
+  add_library(utils_sve OBJECT src/simd/distances_sve.cc)
+
+  target_compile_options(utils_neon PRIVATE -march=armv8-a+simd)
+  target_compile_options(utils_sve PRIVATE -march=armv8-a+sve)
+
+  add_library(
+    knowhere_utils STATIC
+    ${UTILS_SRC} $<TARGET_OBJECTS:utils_neon> $<TARGET_OBJECTS:utils_sve>)
   target_link_libraries(knowhere_utils PUBLIC glog::glog)
 endif()
 

src/simd/distances_sve.cc

@@ -0,0 +1,185 @@
+// Copyright (C) 2019-2023 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License.
+
+#include "distances_sve.h"
+
+#include <arm_sve.h>
+
+#include <cmath>
+
+#include "faiss/impl/platform_macros.h"
+#pragma GCC optimize("O3,fast-math,inline")
+#if defined(__ARM_FEATURE_SVE)
+namespace faiss {
+
+float
+fvec_L2sqr_sve(const float* x, const float* y, size_t d) {
+    svfloat32_t sum = svdup_f32(0.0f);
+    size_t i = 0;
+
+    svbool_t pg = svptrue_b32();
+
+    while (i < d) {
+        if (d - i < svcntw())
+            pg = svwhilelt_b32(i, d);
+
+        svfloat32_t a = svld1_f32(pg, x + i);
+        svfloat32_t b = svld1_f32(pg, y + i);
+        svfloat32_t diff = svsub_f32_m(pg, a, b);
+        sum = svmla_f32_m(pg, sum, diff, diff);
+        i += svcntw();
+    }
+
+    return svaddv_f32(svptrue_b32(), sum);
+}
+
+float
+fvec_L1_sve(const float* x, const float* y, size_t d) {
+    svfloat32_t sum = svdup_f32(0.0f);
+    size_t i = 0;
+
+    svbool_t pg = svptrue_b32();
+
+    while (i < d) {
+        if (d - i < svcntw())
+            pg = svwhilelt_b32(i, d);
+
+        svfloat32_t a = svld1_f32(pg, x + i);
+        svfloat32_t b = svld1_f32(pg, y + i);
+        svfloat32_t diff = svabs_f32_x(pg, svsub_f32_m(pg, a, b));
+        sum = svadd_f32_m(pg, sum, diff);
+        i += svcntw();
+    }
+
+    return svaddv_f32(svptrue_b32(), sum);
+}
+
+float
+fvec_Linf_sve(const float* x, const float* y, size_t d) {
+    svfloat32_t max_val = svdup_f32(0.0f);
+    size_t i = 0;
+
+    svbool_t pg = svptrue_b32();
+
+    while (i < d) {
+        if (d - i < svcntw())
+            pg = svwhilelt_b32(i, d);
+
+        svfloat32_t a = svld1_f32(pg, x + i);
+        svfloat32_t b = svld1_f32(pg, y + i);
+        svfloat32_t diff = svabs_f32_x(pg, svsub_f32_m(pg, a, b));
+        max_val = svmax_f32_m(pg, max_val, diff);
+        i += svcntw();
+    }
+
+    return svmaxv_f32(svptrue_b32(), max_val);
+}
+
+float
+fvec_norm_L2sqr_sve(const float* x, size_t d) {
+    svfloat32_t sum = svdup_f32(0.0f);
+    size_t i = 0;
+
+    svbool_t pg = svptrue_b32();
+
+    while (i < d) {
+        if (d - i < svcntw())
+            pg = svwhilelt_b32(i, d);
+
+        svfloat32_t a = svld1_f32(pg, x + i);
+        sum = svmla_f32_m(pg, sum, a, a);
+        i += svcntw();
+    }
+
+    return svaddv_f32(svptrue_b32(), sum);
+}
+
+void
+fvec_madd_sve(size_t n, const float* a, float bf, const float* b, float* c) {
+    size_t i = 0;
+    svfloat32_t bf_vec = svdup_f32(bf);
+
+    svbool_t pg = svptrue_b32();
+
+    while (i < n) {
+        if (n - i < svcntw())
+            pg = svwhilelt_b32(i, n);
+
+        svfloat32_t a_vec = svld1_f32(pg, a + i);
+        svfloat32_t b_vec = svld1_f32(pg, b + i);
+        svfloat32_t c_vec = svmla_f32_m(pg, a_vec, b_vec, bf_vec);
+        svst1_f32(pg, c + i, c_vec);
+        i += svcntw();
+    }
+}
+
+int
+fvec_madd_and_argmin_sve(size_t n, const float* a, float bf, const float* b, float* c) {
+    size_t i = 0;
+    svfloat32_t min_val = svdup_f32(INFINITY);
+    svuint32_t min_idx = svdup_u32(0);
+    svuint32_t idx_base = svindex_u32(0, 1);
+
+    svfloat32_t bf_vec = svdup_f32(bf);
+    svbool_t pg = svptrue_b32();
+
+    while (i < n) {
+        if (n - i < svcntw())
+            pg = svwhilelt_b32(i, n);
+
+        svuint32_t idx = svadd_u32_z(pg, idx_base, svdup_u32(i));
+        svfloat32_t a_vec = svld1_f32(pg, a + i);
+        svfloat32_t b_vec = svld1_f32(pg, b + i);
+        svfloat32_t c_vec = svmla_f32_m(pg, a_vec, b_vec, bf_vec);
+        svst1_f32(pg, c + i, c_vec);
+
+        svbool_t cmp = svcmplt(pg, c_vec, min_val);
+        min_val = svsel_f32(cmp, c_vec, min_val);
+        min_idx = svsel_u32(cmp, idx, min_idx);
+
+        i += svcntw();
+    }
+
+    float min_value = svminv_f32(svptrue_b32(), min_val);
+    svbool_t pg_min = svcmpeq(svptrue_b32(), min_val, svdup_f32(min_value));
+    uint32_t min_index = svlastb_u32(pg_min, min_idx);
+
+    return static_cast<int>(min_index);
+}
+
+void
+fvec_L2sqr_batch_4_sve(const float* x, const float* y0, const float* y1, const float* y2, const float* y3,
+                       const size_t d, float& dis0, float& dis1, float& dis2, float& dis3) {
+    float d0 = 0;
+    float d1 = 0;
+    float d2 = 0;
+    float d3 = 0;
+
+    for (size_t i = 0; i < d; ++i) {
+        const float q0 = x[i] - y0[i];
+        const float q1 = x[i] - y1[i];
+        const float q2 = x[i] - y2[i];
+        const float q3 = x[i] - y3[i];
+        d0 += q0 * q0;
+        d1 += q1 * q1;
+        d2 += q2 * q2;
+        d3 += q3 * q3;
+    }
+
+    dis0 = d0;
+    dis1 = d1;
+    dis2 = d2;
+    dis3 = d3;
+}
+
+}  // namespace faiss
+
+#endif

src/simd/distances_sve.h

@@ -0,0 +1,45 @@
+// Copyright (C) 2019-2023 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License.
+
+#include <arm_sve.h>
+
+#include <cstdint>
+#include <cstdio>
+#if defined(__ARM_FEATURE_SVE)
+namespace faiss {
+
+float
+fvec_L2sqr_sve(const float* x, const float* y, size_t d);
+
+float
+fvec_L1_sve(const float* x, const float* y, size_t d);
+
+float
+fvec_Linf_sve(const float* x, const float* y, size_t d);
+
+float
+fvec_norm_L2sqr_sve(const float* x, size_t d);
+
+void
+fvec_madd_sve(size_t n, const float* a, float bf, const float* b, float* c);
+
+int
+fvec_madd_and_argmin_sve(size_t n, const float* a, float bf, const float* b, float* c);
+
+int32_t
+ivec_L2sqr_sve(const int8_t* x, const int8_t* y, size_t d);
+
+void
+fvec_L2sqr_batch_4_sve(const float* x, const float* y0, const float* y1, const float* y2, const float* y3,
+                       const size_t d, float& dis0, float& dis1, float& dis2, float& dis3);
+
+}  // namespace faiss
+#endif

src/simd/hook.cc

@@ -18,6 +18,10 @@
 
 #include "faiss/FaissHook.h"
 
+#if defined(__ARM_FEATURE_SVE)
+#include "distances_sve.h"
+#endif
+
 #if defined(__ARM_NEON)
 #include "distances_neon.h"
 #endif
@@ -137,13 +141,17 @@ enable_patch_for_fp32_bf16() {
         fvec_L2sqr_batch_4 = fvec_L2sqr_batch_4_ref_bf16_patch;
     }
 #endif
-#if defined(__ARM_NEON)
 
-    fvec_inner_product = fvec_inner_product_neon_bf16_patch;
-    fvec_L2sqr = fvec_L2sqr_neon_bf16_patch;
+#if defined(__aarch64__)
 
-    fvec_inner_product_batch_4 = fvec_inner_product_batch_4_neon_bf16_patch;
+#if defined(__ARM_NEON) && !defined(__ARM_FEATURE_SVE)
+
+    fvec_L2sqr = fvec_L2sqr_neon_bf16_patch;
     fvec_L2sqr_batch_4 = fvec_L2sqr_batch_4_neon_bf16_patch;
+    fvec_inner_product = fvec_inner_product_neon_bf16_patch;
+    fvec_inner_product_batch_4 = fvec_inner_product_batch_4_neon_bf16_patch;
+
+#endif
 
 #endif
 }
@@ -319,12 +327,42 @@ fvec_hook(std::string& simd_type) {
     }
 #endif
 
-#if defined(__ARM_NEON)
+#if defined(__aarch64__)
+
+#if defined(__ARM_FEATURE_SVE)
+    // ToDo: Enable remaining functions on SVE
+
+    fvec_L2sqr = fvec_L2sqr_sve;
+    fvec_L1 = fvec_L1_sve;
+    fvec_Linf = fvec_Linf_sve;
+    fvec_norm_L2sqr = fvec_norm_L2sqr_sve;
+    fvec_madd = fvec_madd_sve;
+    fvec_madd_and_argmin = fvec_madd_and_argmin_sve;
+
+    fvec_inner_product = fvec_inner_product_neon;
+    fvec_L2sqr_ny = fvec_L2sqr_ny_neon;
+    fvec_inner_products_ny = fvec_inner_products_ny_neon;
+
+    ivec_inner_product = ivec_inner_product_neon;
+    ivec_L2sqr = ivec_L2sqr_neon;
+
+    fp16_vec_inner_product = fp16_vec_inner_product_neon;
+    fp16_vec_L2sqr = fp16_vec_L2sqr_neon;
+    fp16_vec_norm_L2sqr = fp16_vec_norm_L2sqr_neon;
+
+    bf16_vec_inner_product = bf16_vec_inner_product_neon;
+    bf16_vec_L2sqr = bf16_vec_L2sqr_neon;
+    bf16_vec_norm_L2sqr = bf16_vec_norm_L2sqr_neon;
+    fvec_L2sqr_batch_4 = fvec_L2sqr_batch_4_sve;
+    simd_type = "SVE";
+    support_pq_fast_scan = true;
+
+#elif defined(__ARM_NEON)
+    // NEON functions
     fvec_inner_product = fvec_inner_product_neon;
     fvec_L2sqr = fvec_L2sqr_neon;
     fvec_L1 = fvec_L1_neon;
     fvec_Linf = fvec_Linf_neon;
-
     fvec_norm_L2sqr = fvec_norm_L2sqr_neon;
     fvec_L2sqr_ny = fvec_L2sqr_ny_neon;
     fvec_inner_products_ny = fvec_inner_products_ny_neon;
@@ -355,6 +393,8 @@ fvec_hook(std::string& simd_type) {
 
 #endif
 
+#endif
+
 // ToDo MG: include VSX intrinsics via distances_vsx once _ref tests succeed
 #if defined(__powerpc64__)
     fvec_inner_product = fvec_inner_product_ppc;

tests/ut/test_knowhere_init.cc

@@ -58,7 +58,7 @@ TEST_CASE("Knowhere global config", "[init]") {
 }
 
 TEST_CASE("Knowhere SIMD config", "[simd]") {
-    std::vector<std::string> v = {"AVX512", "AVX2", "SSE4_2", "GENERIC", "NEON"};
+    std::vector<std::string> v = {"AVX512", "AVX2", "SSE4_2", "GENERIC", "NEON", "SVE"};
     std::unordered_set<std::string> s(v.begin(), v.end());
 
     auto res = knowhere::KnowhereConfig::SetSimdType(knowhere::KnowhereConfig::SimdType::AVX512);