SPARC option -mapp-regs

[Sebastian Huber]

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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