This is a tracking issue to add support for Windows ARM64 to internal/cpu and golang.org/x/sys/cpu. They currently don't set any supported cpu flag on this platform, even when Windows provides an API to prove if a given feature is supported by the current computer: IsProcessorFeaturePresent.

This is a mapping of Go feature flags to IsProcessorFeaturePresent flags (note that some flags are taken from the published Windows headers, as learn.microsoft.com is not really up-to-date).

• HasAES => PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE
• HasPMULL => PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE
• HasSHA1 => PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE
• HasSHA2 => PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE
• HasSHA3 => PF_ARM_SHA3_INSTRUCTIONS_AVAILABLE
• HasCRC32 => PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE
• HasSHA512 => PF_ARM_SHA512_INSTRUCTIONS_AVAILABLE
• HasATOMICS => PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE
• HasASIMDDP => PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE
• HasASIMDRDM => PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE
• HasLRCPC => PF_ARM_V83_LRCPC_INSTRUCTIONS_AVAILABLE
• HasSM3=> PF_ARM_V83_LRCPC_INSTRUCTIONS_AVAILABLE
• HasSVE => PF_ARM_SVE_INSTRUCTIONS_AVAILABLE
• HasSVE2 => PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE
• HasJSCVT => PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE

@golang/windows