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/* loongarch_features.c -- check for LoongArch features.
*
* Copyright (C) 2025 Vladislav Shchapov <vladislav@shchapov.ru>
*
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#ifdef LOONGARCH_FEATURES
#include "zbuild.h"
#include "loongarch_features.h"
#include <larchintrin.h>
/*
* https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
*
* Word number Bit number Annotation Implication
* 0x1 25 CRC 1 indicates support for CRC instruction
* 0x1 6 LSX 1 indicates support for 128-bit vector extension
* 0x1 7 LASX 1 indicates support for 256-bit vector expansion
*/
void Z_INTERNAL loongarch_check_features(struct loongarch_cpu_features *features) {
unsigned int w1 = __cpucfg(0x1);
features->has_crc = w1 & 0x2000000;
features->has_lsx = w1 & 0x40;
features->has_lasx = w1 & 0x80;
}
#endif
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