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By explicitly handling this, we can avoid materializing zero in a register. Before: 0x52800019 mov w25, #0x0 0xb94087b6 ldr w22, [x29, #0x84] 0xcb16033b sub x27, x25, x22 After: 0xb94087b9 ldr w25, [x29, #0x84] 0xcb1903fb neg x27, x25