On Mon, Nov 30, 2020 at 01:58:27PM +0000, David Laight wrote: > > And actually, the same applies on BE, but the other way around. So we > > should mark __xl as an output register as well, as __xl will assume > > the right value depending on the endianness. > > Why not use "+r" to indicate than an 'output' parameter is also > used as an input. > > Rather cleaner than specifying the same C variable as both > input and output.
You have an incorrect understanding. "__n" is the input operand in r0. "__rem" is the output operand in r0/r1. No single C variable is used as both an input and an output. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
