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237 lines
11 KiB
C
237 lines
11 KiB
C
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// This file is derived from instrset_detect.cpp and instrset.h with minor style changes
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/*****************************************************************************
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* Author: Agner Fog
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* Date created: 2012-05-30
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* Last modified: 2022-07-20
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* Version: 2.02.00
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* Project: vector class library
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* Description:
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* Functions for checking which instruction sets are supported.
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*
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* (c) Copyright 2012-2022 Agner Fog.
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* Apache License version 2.0 or later.
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******************************************************************************/
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#ifndef INSTRSET_DETECT_H
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#define INSTRSET_DETECT_H
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#if defined(__x86_64__) || defined(__amd64) || defined(_M_X64) || defined(_M_AMD64) || \
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defined(__i386__) || defined(__i386) || defined(_M_IX86)
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#include <stdint.h> // Define integer types with known size
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#include <limits.h> // Define INT_MAX
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// Header files for non-vector intrinsic functions including _BitScanReverse(int), __cpuid(int[4],int), _xgetbv(int)
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#ifdef _MSC_VER // Microsoft compiler or compatible Intel compiler
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#include <intrin.h>
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#pragma warning(disable: 6323 4514 4710 4711) // Diasble annoying warnings
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#else
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#include <x86intrin.h> // Gcc or Clang compiler
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#endif
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// Define interface to cpuid instruction.
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// input: functionnumber = leaf (eax), ecxleaf = subleaf(ecx)
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// output: output[0] = eax, output[1] = ebx, output[2] = ecx, output[3] = edx
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static inline void cpuid(int output[4], int functionnumber, int ecxleaf = 0) {
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#if defined(__GNUC__) || defined(__clang__) // use inline assembly, Gnu/AT&T syntax
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int a, b, c, d;
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__asm("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "a"(functionnumber), "c"(ecxleaf) : );
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output[0] = a;
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output[1] = b;
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output[2] = c;
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output[3] = d;
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#elif defined (_MSC_VER) // Microsoft compiler, intrin.h included
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__cpuidex(output, functionnumber, ecxleaf); // intrinsic function for CPUID
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#else // unknown platform. try inline assembly with masm/intel syntax
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__asm {
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mov eax, functionnumber
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mov ecx, ecxleaf
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cpuid;
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mov esi, output
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mov[esi], eax
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mov[esi + 4], ebx
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mov[esi + 8], ecx
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mov[esi + 12], edx
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}
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#endif
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}
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// Define interface to xgetbv instruction
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static inline uint64_t xgetbv (int ctr) {
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#if (defined (_MSC_FULL_VER) && _MSC_FULL_VER >= 160040000) || (defined (__INTEL_COMPILER) && __INTEL_COMPILER >= 1200)
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// Microsoft or Intel compiler supporting _xgetbv intrinsic
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return uint64_t(_xgetbv(ctr)); // intrinsic function for XGETBV
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#elif defined(__GNUC__) || defined (__clang__) // use inline assembly, Gnu/AT&T syntax
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uint32_t a, d;
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__asm("xgetbv" : "=a"(a),"=d"(d) : "c"(ctr) : );
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return a | (uint64_t(d) << 32);
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#else // #elif defined (_WIN32) // other compiler. try inline assembly with masm/intel/MS syntax
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uint32_t a, d;
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__asm {
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mov ecx, ctr
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_emit 0x0f
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_emit 0x01
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_emit 0xd0 ; // xgetbv
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mov a, eax
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mov d, edx
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}
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return a | (uint64_t(d) << 32);
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#endif
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}
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/* find supported instruction set
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return value:
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0 = 80386 instruction set
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1 or above = SSE (XMM) supported by CPU (not testing for OS support)
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2 or above = SSE2
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3 or above = SSE3
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4 or above = Supplementary SSE3 (SSSE3)
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5 or above = SSE4.1
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6 or above = SSE4.2
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7 or above = AVX supported by CPU and operating system
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8 or above = AVX2
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9 or above = AVX512F
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10 or above = AVX512VL, AVX512BW, AVX512DQ
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*/
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static int instrset_detect(void) {
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static int iset = -1; // remember value for next call
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if (iset >= 0) {
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return iset; // called before
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}
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iset = 0; // default value
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int abcd[4] = {0,0,0,0}; // cpuid results
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cpuid(abcd, 0); // call cpuid function 0
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if (abcd[0] == 0) return iset; // no further cpuid function supported
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cpuid(abcd, 1); // call cpuid function 1 for feature flags
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if ((abcd[3] & (1 << 0)) == 0) return iset; // no floating point
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if ((abcd[3] & (1 << 23)) == 0) return iset; // no MMX
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if ((abcd[3] & (1 << 15)) == 0) return iset; // no conditional move
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if ((abcd[3] & (1 << 24)) == 0) return iset; // no FXSAVE
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if ((abcd[3] & (1 << 25)) == 0) return iset; // no SSE
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iset = 1; // 1: SSE supported
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if ((abcd[3] & (1 << 26)) == 0) return iset; // no SSE2
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iset = 2; // 2: SSE2 supported
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if ((abcd[2] & (1 << 0)) == 0) return iset; // no SSE3
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iset = 3; // 3: SSE3 supported
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if ((abcd[2] & (1 << 9)) == 0) return iset; // no SSSE3
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iset = 4; // 4: SSSE3 supported
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if ((abcd[2] & (1 << 19)) == 0) return iset; // no SSE4.1
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iset = 5; // 5: SSE4.1 supported
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if ((abcd[2] & (1 << 23)) == 0) return iset; // no POPCNT
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if ((abcd[2] & (1 << 20)) == 0) return iset; // no SSE4.2
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iset = 6; // 6: SSE4.2 supported
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if ((abcd[2] & (1 << 27)) == 0) return iset; // no OSXSAVE
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if ((xgetbv(0) & 6) != 6) return iset; // AVX not enabled in O.S.
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if ((abcd[2] & (1 << 28)) == 0) return iset; // no AVX
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iset = 7; // 7: AVX supported
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cpuid(abcd, 7); // call cpuid leaf 7 for feature flags
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if ((abcd[1] & (1 << 5)) == 0) return iset; // no AVX2
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iset = 8;
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if ((abcd[1] & (1 << 16)) == 0) return iset; // no AVX512
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cpuid(abcd, 0xD); // call cpuid leaf 0xD for feature flags
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if ((abcd[0] & 0x60) != 0x60) return iset; // no AVX512
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iset = 9;
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cpuid(abcd, 7); // call cpuid leaf 7 for feature flags
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if ((abcd[1] & (1 << 31)) == 0) return iset; // no AVX512VL
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if ((abcd[1] & 0x40020000) != 0x40020000) return iset; // no AVX512BW, AVX512DQ
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iset = 10;
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return iset;
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}
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// detect if CPU supports the FMA3 instruction set
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static inline bool hasFMA3(void) {
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if (instrset_detect() < 7) return false; // must have AVX
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int abcd[4]; // cpuid results
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cpuid(abcd, 1); // call cpuid function 1
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return ((abcd[2] & (1 << 12)) != 0); // ecx bit 12 indicates FMA3
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}
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// detect if CPU supports the FMA4 instruction set
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static inline bool hasFMA4(void) {
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if (instrset_detect() < 7) return false; // must have AVX
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int abcd[4]; // cpuid results
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cpuid(abcd, 0x80000001); // call cpuid function 0x80000001
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return ((abcd[2] & (1 << 16)) != 0); // ecx bit 16 indicates FMA4
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}
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// detect if CPU supports the XOP instruction set
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static inline bool hasXOP(void) {
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if (instrset_detect() < 7) return false; // must have AVX
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int abcd[4]; // cpuid results
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cpuid(abcd, 0x80000001); // call cpuid function 0x80000001
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return ((abcd[2] & (1 << 11)) != 0); // ecx bit 11 indicates XOP
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}
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// detect if CPU supports the AVX512ER instruction set
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static inline bool hasAVX512ER(void) {
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if (instrset_detect() < 9) return false; // must have AVX512F
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int abcd[4]; // cpuid results
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cpuid(abcd, 7); // call cpuid function 7
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return ((abcd[1] & (1 << 27)) != 0); // ebx bit 27 indicates AVX512ER
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}
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// detect if CPU supports the AVX512VBMI instruction set
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static inline bool hasAVX512VBMI(void) {
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if (instrset_detect() < 10) return false; // must have AVX512BW
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int abcd[4]; // cpuid results
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cpuid(abcd, 7); // call cpuid function 7
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return ((abcd[2] & (1 << 1)) != 0); // ecx bit 1 indicates AVX512VBMI
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}
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// detect if CPU supports the AVX512VBMI2 instruction set
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static inline bool hasAVX512VBMI2(void) {
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if (instrset_detect() < 10) return false; // must have AVX512BW
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int abcd[4]; // cpuid results
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cpuid(abcd, 7); // call cpuid function 7
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return ((abcd[2] & (1 << 6)) != 0); // ecx bit 6 indicates AVX512VBMI2
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}
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// detect if CPU supports the F16C instruction set
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static inline bool hasF16C(void) {
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if (instrset_detect() < 7) return false; // must have AVX
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int abcd[4]; // cpuid results
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cpuid(abcd, 1); // call cpuid function 1
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return ((abcd[2] & (1 << 29)) != 0); // ecx bit 29 indicates F16C
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}
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// detect if CPU supports the AVX512_FP16 instruction set
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static inline bool hasAVX512FP16(void) {
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if (instrset_detect() < 10) return false; // must have AVX512
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int abcd[4]; // cpuid results
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cpuid(abcd, 7); // call cpuid function 1
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return ((abcd[3] & (1 << 23)) != 0); // edx bit 23 indicates AVX512_FP16
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}
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#endif
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#endif
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