Hello,
GCC has a SPARC specific option -mapp-regs:
http://gcc.gnu.org/onlinedocs/gcc/SPARC-Options.html
"Specify -mapp-regs to generate output using the global registers 2 through 4,
which the SPARC SVR4 ABI reserves for applications. This is the default.
To be fully SVR4 ABI-compliant at the cost of some performance loss, specify
-mno-app-regs. You should compile libraries and system software with this option."
I think what is missing here is if GCC uses these registers as volatile (may be
destroyed across a function call) or not.
--
Sebastian Huber, embedded brains GmbH
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