133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* -----------------------------------------------------------------------------
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* File: Simd.h
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* Description:
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* This file implements the function for detecting SIMD support.
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*
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* Author: Mineplay
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* -----------------------------------------------------------------------------
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*/
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#include "../../Include/Hallocy/Utils/Simd.h"
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static HallocySimdType hallocy_supported_simd = HALLOCY_SIMD_UNDEFINED;
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HallocySimdType hallocy_is_simd_supported(void) {
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if (hallocy_supported_simd != HALLOCY_SIMD_UNDEFINED) {
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return hallocy_supported_simd;
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}
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#if defined(_MSC_VER)
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#if defined(_M_ARM64)
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if (isProcessorFeaturePresent(PF_ARM64_SVE)) {
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hallocy_supported_simd = HALLOCY_SIMD_NEON;
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return hallocy_supported_simd;
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}
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#else
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int cpu_info[4] = { 0 };
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__cpuid(cpu_info, 7);
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if ((cpu_info[1] & (1 << 16)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX512;
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return hallocy_supported_simd;
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}
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if ((cpu_info[1] & (1 << 5)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX2;
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return hallocy_supported_simd;
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}
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__cpuid(cpu_info, 1);
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if ((cpu_info[2] & (1 << 28)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX;
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return hallocy_supported_simd;
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}
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if ((cpu_info[3] & (1 << 26)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_SSE2;
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return hallocy_supported_simd;
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}
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if ((cpu_info[3] & (1 << 25)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_SSE2;
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return hallocy_supported_simd;
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}
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#endif
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#else
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#if defined(__aarch64__) || defined(__arm__)
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int file_descriptor = open("/proc/cpuinfo", O_READONLY);
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if (file_descriptor == -1) {
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return hallocy_supported_simd;
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}
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char buffer[256];
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int bytes_read = read(file_descriptor, buffer, sizeof(buffer));
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while (bytes_read > 0) {
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for (size_t i = 0; i < bytes_read - 4; i++) {
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if (buffer[i] == 'n' && buffer[i + 1] == 'e' && buffer[i + 2] == 'o' && buffer[i + 3] == 'n') {
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close(file_descriptor);
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hallocy_supported_simd = HALLOCY_SIMD_NEON;
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return hallocy_supported_simd;
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}
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}
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bytes_read = read(file_descriptor, buffer, sizeof(buffer));
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}
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close(file_descriptor);
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#else
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unsigned int a, b, c, d;
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__asm__ __volatile__ (
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"cpuid"
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: "=a" (a), "=b" (b), "=c" (c), "=d" (d)
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: "a" (7)
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);
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if ((b & (1 << 16)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX512;
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return hallocy_supported_simd;
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}
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if ((b & (1 << 5)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX2;
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return hallocy_supported_simd;
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}
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__asm__ __volatile__ (
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"cpuid"
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: "=a" (a), "=b" (b), "=c" (c), "=d" (d)
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: "a" (1)
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);
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if ((c & (1 << 28)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_AVX;
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return hallocy_supported_simd;
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}
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if ((c & (1 << 26)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_SSE2;
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return hallocy_supported_simd;
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}
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if ((c & (1 << 25)) != 0) {
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hallocy_supported_simd = HALLOCY_SIMD_SSE;
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return hallocy_supported_simd;
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}
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#endif
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#endif
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hallocy_supported_simd = HALLOCY_SIMD_NONE;
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return hallocy_supported_simd;
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}
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