SPARC register

[mr at racal-itd.co.uk]

I'm writing some SPARC assembler (I need speed) and would like to use as
many registers as possible. I'd appreciate guidance on which of the SPARC
global registers (%g1-%g7) I should use to avoid upsetting other code
which is written in C, plus SunOS libraries (specifically libc and
SunView).

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