We plan let encodekey128/256 not store "0" value xmm* regs into handle mem.
XMM0 -> Handle[127:0]; // AAD XMM1 -> Handle[255:128]; // Integrity Tag XMM2 -> Handle[383:256]; // CipherText XMM4 := 0; // Reserved for future usage XMM5 := 0; // Reserved for future usage XMM6 := 0; // Reserved for future usage