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NEC
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.
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