Add AVX512 and ARM SVE pre-sieving

CMakeLists.txt

@@ -86,9 +86,14 @@ set(LIB_SRC src/api-c.cpp
 
 if(WITH_MULTIARCH)
     include("${PROJECT_SOURCE_DIR}/cmake/multiarch_x86_popcnt.cmake")
+    include("${PROJECT_SOURCE_DIR}/cmake/multiarch_avx512_bw.cmake")
     include("${PROJECT_SOURCE_DIR}/cmake/multiarch_avx512_vbmi2.cmake")
 
-    if(multiarch_x86_popcnt OR multiarch_avx512_vbmi2)
+    if(NOT multiarch_avx512_bw)
+        include("${PROJECT_SOURCE_DIR}/cmake/multiarch_sve_arm.cmake")
+    endif()
+
+    if(multiarch_x86_popcnt OR multiarch_avx512_bw OR multiarch_avx512_vbmi2)
         set(LIB_SRC ${LIB_SRC} src/x86/cpuid.cpp)
     endif()
 endif()

ChangeLog

@@ -1,11 +1,12 @@
-Changes in version 12.6, 10/11/2024
+Changes in version 12.6, 11/11/2024
 ===================================
 
 * CpuInfo.cpp: Correctly detect Intel Arrow Lake CPU cache
   topology on Windows and Linux.
 * PreSieve.cpp: Increased pre-sieving from primes <= 100 to
   primes <= 163. Memory usage of pre-sieve lookup tables has been
   reduced from 210 kilobytes to 123 kilobytes.
+* PreSieve.cpp: Added AVX512 and ARM SVE multiarch support.
 
 Changes in version 12.5, 22/10/2024
 ===================================

cmake/multiarch_avx512_bw.cmake

@@ -0,0 +1,80 @@
+# We use GCC/Clang's function multi-versioning for AVX512
+# support. This code will automatically dispatch to the
+# AVX512 BW algorithm if the CPU supports it and use the
+# default (portable) algorithm otherwise.
+
+include(CheckCXXSourceCompiles)
+include(CMakePushCheckState)
+
+cmake_push_check_state()
+set(CMAKE_REQUIRED_INCLUDES "${PROJECT_SOURCE_DIR}")
+
+check_cxx_source_compiles("
+    // GCC/Clang function multiversioning for AVX512 is not needed if
+    // the user compiles with -mavx512f -mavx512bw.
+    // GCC/Clang function multiversioning generally causes a minor
+    // overhead, hence we disable it if it is not needed.
+    #if defined(__AVX512F__) && \
+        defined(__AVX512BW__)
+      Error: AVX512BW multiarch not needed!
+    #endif
+
+    #include <src/x86/cpuid.cpp>
+    #include <immintrin.h>
+    #include <stdint.h>
+    #include <cstddef>
+
+    __attribute__ ((target (\"avx512f,avx512bw\")))
+    void AND_PreSieveTables_avx512(const uint8_t* __restrict preSieve0,
+                                   const uint8_t* __restrict preSieve1,
+                                   uint8_t* __restrict sieve,
+                                   std::size_t bytes)
+    {
+        std::size_t i = 0;
+
+        for (; i + 64 <= bytes; i += sizeof(__m512i))
+        {
+            _mm512_storeu_epi8((__m512i*) &sieve[i],
+                _mm512_and_si512(_mm512_loadu_epi8((const __m512i*) &preSieve0[i]), 
+                                 _mm512_loadu_epi8((const __m512i*) &preSieve1[i])));
+        }
+
+        if (i < bytes)
+        {
+            __mmask64 mask = 0xffffffffffffffffull >> (i + 64 - bytes);
+
+            _mm512_mask_storeu_epi8((__m512i*) &sieve[i], mask,
+                _mm512_and_si512(_mm512_maskz_loadu_epi8(mask, (const __m512i*) &preSieve0[i]), 
+                                 _mm512_maskz_loadu_epi8(mask, (const __m512i*) &preSieve1[i])));
+        }
+    }
+
+    void AND_PreSieveTables_default(const uint8_t* __restrict preSieved0,
+                                    const uint8_t* __restrict preSieved1,
+                                    uint8_t* __restrict sieve,
+                                    std::size_t bytes)
+    {
+        for (std::size_t i = 0; i < bytes; i++)
+            sieve[i] = preSieved0[i] & preSieved1[i];
+    }
+
+    int main()
+    {
+        uint8_t sieve[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable1[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable2[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+
+        if (primesieve::has_cpuid_avx512_bw())
+            AND_PreSieveTables_avx512(&PreSieveTable1[0], &PreSieveTable2[1], &sieve[0], 10);
+        else
+            AND_PreSieveTables_default(&PreSieveTable1[0], &PreSieveTable2[1], &sieve[0], 10);
+
+        return (sieve[0] == 0) ? 0 : 1;
+    }
+" multiarch_avx512_bw)
+
+if(multiarch_avx512_bw)
+    list(APPEND PRIMESIEVE_COMPILE_DEFINITIONS "ENABLE_MULTIARCH_AVX512_BW")
+endif()
+
+cmake_pop_check_state()

cmake/multiarch_sve_arm.cmake

@@ -0,0 +1,78 @@
+# We use GCC/Clang's function multi-versioning for ARM SVE
+# support. This code will automatically dispatch to the
+# ARM SVE algorithm if the CPU supports it and use the default
+# (portable) algorithm otherwise.
+
+include(CheckCXXSourceCompiles)
+include(CMakePushCheckState)
+
+cmake_push_check_state()
+set(CMAKE_REQUIRED_INCLUDES "${PROJECT_SOURCE_DIR}/include")
+
+check_cxx_source_compiles("
+    // GCC/Clang function multiversioning for ARM SVE is not needed
+    // if the user compiles with -march=armv8-a+sve. GCC/Clang
+    // function multiversioning generally causes a minor overhead,
+    // hence we disable it if it is not needed.
+    #if defined(__ARM_FEATURE_SVE) && \
+        __has_include(<arm_sve.h>)
+      Error: ARM SVE multiarch not needed!
+    #endif
+
+    #include <primesieve/cpu_supports_arm_sve.hpp>
+    #include <arm_sve.h>
+    #include <stdint.h>
+    #include <cstddef>
+
+    __attribute__ ((target (\"arch=armv8-a+sve\")))
+    void AND_PreSieveTables_arm_sve(const uint8_t* __restrict preSieved0,
+                                    const uint8_t* __restrict preSieved1,
+                                    const uint8_t* __restrict preSieved2,
+                                    const uint8_t* __restrict preSieved3,
+                                    uint8_t* __restrict sieve,
+                                    std::size_t bytes)
+    {
+        for (std::size_t i = 0; i < bytes; i += svcntb())
+        {
+            svbool_t pg = svwhilelt_b8(i, bytes);
+
+            svst1_u8(pg, &sieve[i],
+                svand_u8_x(svptrue_b64(),
+                    svand_u8_z(pg, svld1_u8(pg, &preSieved0[i]), svld1_u8(pg, &preSieved1[i])),
+                    svand_u8_z(pg, svld1_u8(pg, &preSieved2[i]), svld1_u8(pg, &preSieved3[i]))));
+        }
+    }
+
+    void AND_PreSieveTables_default(const uint8_t* __restrict preSieved0,
+                                    const uint8_t* __restrict preSieved1,
+                                    const uint8_t* __restrict preSieved2,
+                                    const uint8_t* __restrict preSieved3,
+                                    uint8_t* __restrict sieve,
+                                    std::size_t bytes)
+    {
+        for (std::size_t i = 0; i < bytes; i++)
+            sieve[i] = preSieved0[i] & preSieved1[i] & preSieved2[i] & preSieved3[i];
+    }
+
+    int main()
+    {
+        uint8_t sieve[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable1[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable2[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable3[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        uint8_t PreSieveTable4[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+
+        if (cpu_supports_sve)
+            AND_PreSieveTables_arm_sve(&PreSieveTable1[0], &PreSieveTable2[1], &PreSieveTable3[1], &PreSieveTable4[1], &sieve[0], 10);
+        else
+            AND_PreSieveTables_default(&PreSieveTable1[0], &PreSieveTable2[1], &PreSieveTable3[1], &PreSieveTable4[1], &sieve[0], 10);
+
+        return (sieve[0] == 0) ? 0 : 1;
+    }
+" multiarch_sve_arm)
+
+if(multiarch_sve_arm)
+    list(APPEND PRIMESIEVE_COMPILE_DEFINITIONS "ENABLE_MULTIARCH_ARM_SVE")
+endif()
+
+cmake_pop_check_state()

include/primesieve/cpu_supports_arm_sve.hpp

@@ -0,0 +1,27 @@
+///
+/// @file  cpu_supports_arm_sve.hpp
+///        Check if the CPU supports the ARM SVE instruction set.
+///
+/// Copyright (C) 2024 Kim Walisch, <[email protected]>
+///
+/// This file is distributed under the BSD License. See the COPYING
+/// file in the top level directory.
+///
+
+#ifndef CPU_SUPPORTS_ARM_SVE_HPP
+#define CPU_SUPPORTS_ARM_SVE_HPP
+
+#include "macros.hpp"
+
+#if __has_builtin(__builtin_cpu_supports)
+
+namespace {
+
+/// Initialized at startup
+const bool cpu_supports_sve = __builtin_cpu_supports("sve");
+
+} // namespace
+
+#endif // __builtin_cpu_supports
+
+#endif

include/primesieve/cpu_supports_avx512_bw.hpp

@@ -0,0 +1,27 @@
+///
+/// @file  cpu_supports_avx512_bw.hpp
+/// @brief Detect if the x86 CPU supports AVX512 BW.
+///
+/// Copyright (C) 2024 Kim Walisch, <[email protected]>
+///
+/// This file is distributed under the BSD License. See the COPYING
+/// file in the top level directory.
+///
+
+#ifndef CPU_SUPPORTS_AVX512_BW_HPP
+#define CPU_SUPPORTS_AVX512_BW_HPP
+
+namespace primesieve {
+
+bool has_cpuid_avx512_bw();
+
+} // namespace
+
+namespace {
+
+/// Initialized at startup
+const bool cpu_supports_avx512_bw = primesieve::has_cpuid_avx512_bw();
+
+} // namespace
+
+#endif