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V850 options options  

The following are the ‘-m’ options for V850 implementations.
-mlong-calls
-mno-long-calls
Treat all calls as being far away (or near). If calls are assumed to be far away, the compiler will always load the functions address up into a register, and call indirect through the pointer.
 
-mno-ep
-mep
Do not optimize (or optimize) basic blocks that use the same index pointer 4 or more times to copy pointer into the ep register, and use the shorter sld and sst instructions. The -mep option is on by default if you optimize.
 
-mno-prolog-function
-mprolog-function
Do not use (do use) external functions to save and restore registers at the prolog and epilog of a function. The external functions are slower, but use less code space if more than one function saves the same number of registers. The -mprolog-function option is on by default if you optimize.
-mspace
Try to make the code as small as possible. At present, this just turns on the -mep and -mprolog-function options.
 
-mtda=n
Put static or global variables whose size is n bytes or less into the tiny data area that register ep points to. The tiny data area can hold up to 256 bytes in total (128 bytes for byte references).
 
-msda=n
Put static or global variables whose size is n bytes or less into the small data area that register gp points to. The small data area can hold up to 64 kilobytes.

-mzda=n

Put static or global variables whose size is n bytes or less into the first 32 kilobytes of memory.
 
-mv850
Specify that the target processor is the V850.
 
-mbig-switch
Generate code suitable for big switch tables. Use this option only if the assembler/linker complain about out of range branches within a switch table.
 
-mapp-regs
This option will cause r2 and r5 to be used in the code generated by the compiler. This setting is the default.
 
-mno-app-regs
This option will cause r2 and r5 to be treated as fixed registers.