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- x7, x8: Used to store address for Alpha and Beta. As Alpha & Beta was not used in k-loops, use x0, x1 to load Alpha & Beta's addresses after k-loops are completed, since A & B's addresses are no longer needed there. This "ldr [addr]; -> ldr val, [addr]" would not cause much performance drawback since it is done outside k-loops and there are plenty of instructions between Alpha & Beta's loading and usage. - x9: Used to store cs_c. x9 is multiplied by 8 into x10 and not used any longer. Directly loading cs_c and into x10 and scale by 8 spares x9 straightforwardly. - x11, x12: Not used at all. Simply remove from clobber list. - x13: Alike x9, loaded and scaled by 8 into x14, except that x13 is also used in a conditional branch so that "cmp x13, #1" needs to be modified into "cmp x14, #8" to completely free x13. - x3, x4: Used to store next_a & next_b. Untouched in k-loops. Load these addresses into x0 and x1 after Alpha & Beta are both loaded, since then neigher address of A/B nor address of Alpha/Beta is needed.