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Add Windows ARM SVE/SVE2 runtime detection via IsProcessorFeaturePresent

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Corentin Chary 2026-01-26 09:30:00 +01:00
parent 989253e572
commit 1bf764ffc8
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1 changed files with 16 additions and 6 deletions
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22
lib/common/cpu.h
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@ -266,6 +266,9 @@ typedef struct {
unsigned long hwcap2;
} ZSTD_arm_cpuinfo_t;
#define ZSTD_ARM_HWCAP_SVE_BIT 22
#define ZSTD_ARM_HWCAP2_SVE2_BIT 1
MEM_STATIC ZSTD_arm_cpuinfo_t ZSTD_arm_cpuinfo(void) {
ZSTD_arm_cpuinfo_t info;
info.hwcap = 0;
@ -290,17 +293,24 @@ MEM_STATIC ZSTD_arm_cpuinfo_t ZSTD_arm_cpuinfo(void) {
#elif defined(_WIN32)
/* Windows on ARM - use IsProcessorFeaturePresent() */
/* Note: As of 2024, Windows on ARM doesn't expose SVE/SVE2 through this API */
/* We leave hwcap as 0, which will disable runtime detection */
(void)info;
# ifndef PF_ARM_SVE_INSTRUCTIONS_AVAILABLE
# define PF_ARM_SVE_INSTRUCTIONS_AVAILABLE 46
# endif
# ifndef PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE
# define PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE 47
# endif
/* Map Windows processor features to Linux-style hwcap bits for consistency */
if (IsProcessorFeaturePresent(PF_ARM_SVE_INSTRUCTIONS_AVAILABLE)) {
info.hwcap |= (1UL << ZSTD_ARM_HWCAP_SVE_BIT);
}
if (IsProcessorFeaturePresent(PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE)) {
info.hwcap2 |= (1UL << ZSTD_ARM_HWCAP2_SVE2_BIT);
}
#endif
return info;
}
#define ZSTD_ARM_HWCAP_SVE_BIT 22
#define ZSTD_ARM_HWCAP2_SVE2_BIT 1
MEM_STATIC int ZSTD_arm_cpuinfo_sve(ZSTD_arm_cpuinfo_t const cpuinfo) {
return ((cpuinfo.hwcap) & (1UL << ZSTD_ARM_HWCAP_SVE_BIT)) != 0;
}