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(gcc-300.info)V850 Options

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V850 Options
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   These `-m' options are defined for V850 implementations:

`-mlong-calls'
`-mno-long-calls'
     Treat all calls as being far away (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 (do 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.