-mlong-calls-mno-long-calls- Treat all calls as being far away (near). If calls are assumed to be
far away, the compiler always loads the function's address into a
register, and calls 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 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.
-mv850e3v5- Specify that the target processor is the V850E3V5. The preprocessor
constant
__v850e3v5__ is defined if this option is used.
-mv850e2v4- Specify that the target processor is the V850E3V5. This is an alias for
the -mv850e3v5 option.
-mv850e2v3- Specify that the target processor is the V850E2V3. The preprocessor
constant
__v850e2v3__ is defined if this option is used.
-mv850e2- Specify that the target processor is the V850E2. The preprocessor
constant
__v850e2__ is defined if this option is used.
-mv850e1- Specify that the target processor is the V850E1. The preprocessor
constants
__v850e1__ and __v850e__ are defined if
this option is used.
-mv850es- Specify that the target processor is the V850ES. This is an alias for
the -mv850e1 option.
-mv850e- Specify that the target processor is the V850E. The preprocessor
constant
__v850e__ is defined if this option is used.
If neither -mv850 nor -mv850e nor -mv850e1
nor -mv850e2 nor -mv850e2v3 nor -mv850e3v5
are defined then a default target processor is chosen and the
relevant ‘__v850*__’ preprocessor constant is defined.
The preprocessor constants __v850 and __v851__ are always
defined, regardless of which processor variant is the target.
-mdisable-callt-mno-disable-callt- This option suppresses generation of the
CALLT instruction for the
v850e, v850e1, v850e2, v850e2v3 and v850e3v5 flavors of the v850
architecture.
This option is enabled by default when the RH850 ABI is
in use (see -mrh850-abi), and disabled by default when the
GCC ABI is in use. If CALLT instructions are being generated
then the C preprocessor symbol __V850_CALLT__ is defined.
-mrelax-mno-relax- Pass on (or do not pass on) the -mrelax command-line option
to the assembler.
-mlong-jumps-mno-long-jumps- Disable (or re-enable) the generation of PC-relative jump instructions.
-msoft-float-mhard-float- Disable (or re-enable) the generation of hardware floating point
instructions. This option is only significant when the target
architecture is ‘V850E2V3’ or higher. If hardware floating point
instructions are being generated then the C preprocessor symbol
__FPU_OK__ is defined, otherwise the symbol
__NO_FPU__ is defined.
-mloop- Enables the use of the e3v5 LOOP instruction. The use of this
instruction is not enabled by default when the e3v5 architecture is
selected because its use is still experimental.
-mrh850-abi-mghs- Enables support for the RH850 version of the V850 ABI. This is the
default. With this version of the ABI the following rules apply:
- Integer sized structures and unions are returned via a memory pointer
rather than a register.
- Large structures and unions (more than 8 bytes in size) are passed by
value.
- Functions are aligned to 16-bit boundaries.
- The -m8byte-align command-line option is supported.
- The -mdisable-callt command-line option is enabled by
default. The -mno-disable-callt command-line option is not
supported.
When this version of the ABI is enabled the C preprocessor symbol
__V850_RH850_ABI__ is defined.
-mgcc-abi- Enables support for the old GCC version of the V850 ABI. With this
version of the ABI the following rules apply:
- Integer sized structures and unions are returned in register
r10.
- Large structures and unions (more than 8 bytes in size) are passed by
reference.
- Functions are aligned to 32-bit boundaries, unless optimizing for
size.
- The -m8byte-align command-line option is not supported.
- The -mdisable-callt command-line option is supported but not
enabled by default.
When this version of the ABI is enabled the C preprocessor symbol
__V850_GCC_ABI__ is defined.
-m8byte-align-mno-8byte-align- Enables support for
double and long long types to be
aligned on 8-byte boundaries. The default is to restrict the
alignment of all objects to at most 4-bytes. When
-m8byte-align is in effect the C preprocessor symbol
__V850_8BYTE_ALIGN__ is defined.
-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 causes r2 and r5 to be used in the code generated by
the compiler. This setting is the default.
-mno-app-regs- This option causes r2 and r5 to be treated as fixed registers.