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In preparation of next patch that will perform some additional calculations to replace comparison, switch the use of r0 and r3 as r0 has some limitations in some instructions like 'addi/subi'. Also remove outdated comments about the meaning of each register. The registers are used for many things and it would be difficult to accurately describe all things done with a given register. The function is now small enough to get a global view without much description. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/566af5e87685b1a85d3182549c0d520ce2d8877a.1724173828.git.christophe.leroy@csgroup.eu