IsBigEndian records whether the GOARCH's byte order is big endian.

ARM contains the supported CPU features of the current ARM (32-bit) platform.

ARM64 contains the supported CPU features of the current ARMv8(aarch64) platform.

Initialized reports whether the CPU features were initialized.

MIPS64X contains the supported CPU features of the current mips64/mips64le platforms.

PPC64 contains the supported CPU features of the current ppc64/ppc64le platforms.

RISCV64 contains the supported CPU features and performance characteristics for riscv64 platforms.

S390X contains the supported CPU features of the current IBM Z (s390x) platform.

X86 contains the supported CPU features of the current X86/AMD64 platform.

CacheLinePad is used to pad structs to avoid false sharing.