3.17.32 V850 Options
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 shortersld
andsst
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 prologue and epilogue 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.
-
-mv850e1
-
Specify that the target processor is the V850E1. The preprocessor constants `
__v850e1__
' and `
__v850e__
' will be defined if this option is used.
-
-mv850e
-
Specify that the target processor is the V850E. The preprocessor constant `
__v850e__
' will be defined if this option is used.
If neither -mv850 nor -mv850e nor -mv850e1 are defined then a default target processor will be chosen and the relevant ` __v850*__ ' preprocessor constant will be defined.
The preprocessor constants ` __v850 ' and ` __v851__ ' are always defined, regardless of which processor variant is the target.
-
-mdisable-callt
- This option will suppress generation of the CALLT instruction for the v850e and v850e1 flavors of the v850 architecture. The default is -mno-disable-callt which allows the CALLT instruction to be used.