Gcc/10.2.0/gcc/MeP-Options
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3.19.27 MeP Options
-mabsdiff
Enables the
abs
instruction, which is the absolute difference between two registers.-mall-opts
Enables all the optional instructions—average, multiply, divide, bit operations, leading zero, absolute difference, min/max, clip, and saturation.
-maverage
Enables the
ave
instruction, which computes the average of two registers.-mbased=n
Variables of size
n
bytes or smaller are placed in the.based
section by default. Based variables use the$tp
register as a base register, and there is a 128-byte limit to the.based
section.-mbitops
Enables the bit operation instructions—bit test (
btstm
), set (bsetm
), clear (bclrm
), invert (bnotm
), and test-and-set (tas
).-mc=name
Selects which section constant data is placed in.
name
may be ‘tiny
’, ‘near
’, or ‘far
’.-mclip
Enables the
clip
instruction. Note that-mclip
is not useful unless you also provide-mminmax
.-mconfig=name
Selects one of the built-in core configurations. Each MeP chip has one or more modules in it; each module has a core CPU and a variety of coprocessors, optional instructions, and peripherals. The
MeP-Integrator
tool, not part of GCC, provides these configurations through this option; using this option is the same as using all the corresponding command-line options. The default configuration is ‘default
’.-mcop
Enables the coprocessor instructions. By default, this is a 32-bit coprocessor. Note that the coprocessor is normally enabled via the
-mconfig=
option.-mcop32
Enables the 32-bit coprocessor’s instructions.
-mcop64
Enables the 64-bit coprocessor’s instructions.
-mivc2
Enables IVC2 scheduling. IVC2 is a 64-bit VLIW coprocessor.
-mdc
Causes constant variables to be placed in the
.near
section.-mdiv
Enables the
div
anddivu
instructions.-meb
Generate big-endian code.
-mel
Generate little-endian code.
-mio-volatile
Tells the compiler that any variable marked with the
io
attribute is to be considered volatile.-ml
Causes variables to be assigned to the
.far
section by default.-mleadz
Enables the
leadz
(leading zero) instruction.-mm
Causes variables to be assigned to the
.near
section by default.-mminmax
Enables the
min
andmax
instructions.-mmult
Enables the multiplication and multiply-accumulate instructions.
-mno-opts
Disables all the optional instructions enabled by
-mall-opts
.-mrepeat
Enables the
repeat
anderepeat
instructions, used for low-overhead looping.-ms
Causes all variables to default to the
.tiny
section. Note that there is a 65536-byte limit to this section. Accesses to these variables use the%gp
base register.-msatur
Enables the saturation instructions. Note that the compiler does not currently generate these itself, but this option is included for compatibility with other tools, like
as
.-msdram
Link the SDRAM-based runtime instead of the default ROM-based runtime.
-msim
Link the simulator run-time libraries.
-msimnovec
Link the simulator runtime libraries, excluding built-in support for reset and exception vectors and tables.
-mtf
Causes all functions to default to the
.far
section. Without this option, functions default to the.near
section.-mtiny=n
Variables that are
n
bytes or smaller are allocated to the.tiny
section. These variables use the$gp
base register. The default for this option is 4, but note that there’s a 65536-byte limit to the.tiny
section.
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