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Diffstat (limited to 'neozip/arch/loongarch/loongarch_features.c')
| -rw-r--r-- | neozip/arch/loongarch/loongarch_features.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/neozip/arch/loongarch/loongarch_features.c b/neozip/arch/loongarch/loongarch_features.c new file mode 100644 index 0000000000..bedf8499f7 --- /dev/null +++ b/neozip/arch/loongarch/loongarch_features.c @@ -0,0 +1,31 @@ +/* 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 |