Hello, v2 is ready for the review! Based on the v1 review: https://gcc.gnu.org/pipermail/gcc-patches/2024-February/thread.html#646203
Testing for the x86_64-w64-mingw32 target is in progress to avoid regression due to refactoring. Regards, Evgeny Changes from v1 to v2: Adjust the target name to aarch64-*-mingw* to exclude the big-endian target from support. Exclude 64-bit ISA. Rename enum calling_abi to aarch64_calling_abi. Move AArch64 MS ABI definitions FIXED_REGISTERS, CALL_REALLY_USED_REGISTERS, and STATIC_CHAIN_REGNUM from aarch64.h to aarch64-abi-ms.h. Rename TARGET_ARM64_MS_ABI to TARGET_AARCH64_MS_ABI. Exclude TARGET_64BIT from the aarch64 target. Exclude HAVE_GAS_WEAK. Set HAVE_GAS_ALIGNED_COMM to 1 by default. Use a reference from "x86 Windows Options" to "Cygwin and MinGW Options". Update commit descriptions to follow standard style. Rebase from 4th March 2024.
