Add SIMD optimizations for sparse inverted index IP metric (zilliztech#1414)

Signed-off-by: lyang24 <lanqingy93@gmail.com>

Author: lyang24

benchmark/CMakeLists.txt

@@ -55,3 +55,17 @@ benchmark_test(benchmark_simd_qps              hdf5/benchmark_simd_qps.cpp)
 
 benchmark_test(gen_hdf5_file hdf5/gen_hdf5_file.cpp)
 benchmark_test(gen_fbin_file hdf5/gen_fbin_file.cpp)
+
+# Sparse SIMD benchmark (x86_64 only, standalone, no HDF5 required)
+# Only build on x86_64/AMD64, skip on ARM/aarch64/arm64
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|AMD64|amd64|X86_64)$")
+    message(STATUS "Building sparse SIMD benchmark for ${CMAKE_SYSTEM_PROCESSOR}")
+    add_executable(benchmark_sparse_simd benchmark_sparse_simd.cpp)
+    target_link_libraries(benchmark_sparse_simd knowhere)
+    if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+        target_compile_options(benchmark_sparse_simd PRIVATE -mavx512f -mavx512dq)
+    endif()
+    install(TARGETS benchmark_sparse_simd DESTINATION unittest)
+else()
+    message(STATUS "Skipping sparse SIMD benchmark on ${CMAKE_SYSTEM_PROCESSOR} (x86_64 only)")
+endif()

benchmark/Makefile.sparse_simd

@@ -0,0 +1,25 @@
+# Standalone Makefile for sparse SIMD benchmark
+# Usage: make -f Makefile.sparse_simd
+
+CXX ?= g++
+CXXFLAGS = -std=c++17 -O3 -Wall -I../include -I.. -mavx512f -mavx512dq
+LDFLAGS = -pthread
+
+# Detect build directory
+BUILD_DIR = ../build
+
+BENCHMARK_BIN = benchmark_sparse_simd_standalone
+
+all: $(BENCHMARK_BIN)
+
+$(BENCHMARK_BIN): benchmark_sparse_simd.cpp
+	$(CXX) $(CXXFLAGS) -o $@ $< $(LDFLAGS)
+
+run: $(BENCHMARK_BIN)
+	@echo "Running sparse SIMD benchmark..."
+	@./$(BENCHMARK_BIN)
+
+clean:
+	rm -f $(BENCHMARK_BIN)
+
+.PHONY: all run clean