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592ba31e22
By explicitly handling this, we can avoid materializing zero in a register and generate more efficient code altogether. Before: 0x52800016 mov w22, #0x0 0xb94093b5 ldr w21, [x29, #0x90] 0x93407ed7 sxtw x23, w22 0x93407eb9 sxtw x25, w21 0xcb1902f9 sub x25, x23, x25 After: 0xb94093b7 ldr w23, [x29, #0x90] 0x4b1703f9 neg w25, w23 0x93407f39 sxtw x25, w25