Windows hot-patching on Itanium uses a simpler approach than AArch64, overwriting the first instruction bundle with a nop and a 64-bit long branch instruction to redirect execution. Itanium's fixed-size instruction bundles eliminated the need for spare patching space, and contrary to appearances, function-preceding breakpoint bundles serve alignment purposes rather than hot-patching.
Windows implements hot-patching on AArch64 with a simpler mechanism than x86, leveraging fixed-length instructions and 4-byte alignment to avoid mid-instruction patching risks. A 12-byte patch space before each function holds a three-instruction trampoline that redirects execution, while the function entry point itself contains a single branch instruction back to the patch space.