Gcc/10.2.0/gcc/M32R 002fD-Options
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3.19.24 M32R/D Options
These -m
options are defined for Renesas M32R/D architectures:
-m32r2
Generate code for the M32R/2.
-m32rx
Generate code for the M32R/X.
-m32r
Generate code for the M32R. This is the default.
-mmodel=small
Assume all objects live in the lower 16MB of memory (so that their addresses can be loaded with the
ld24
instruction), and assume all subroutines are reachable with thebl
instruction. This is the default.The addressability of a particular object can be set with the
model
attribute.-mmodel=medium
Assume objects may be anywhere in the 32-bit address space (the compiler generates
seth/add3
instructions to load their addresses), and assume all subroutines are reachable with thebl
instruction.-mmodel=large
Assume objects may be anywhere in the 32-bit address space (the compiler generates
seth/add3
instructions to load their addresses), and assume subroutines may not be reachable with thebl
instruction (the compiler generates the much slowerseth/add3/jl
instruction sequence).-msdata=none
Disable use of the small data area. Variables are put into one of
.data
,.bss
, or.rodata
(unless thesection
attribute has been specified). This is the default.The small data area consists of sections
.sdata
and.sbss
. Objects may be explicitly put in the small data area with thesection
attribute using one of these sections.-msdata=sdata
Put small global and static data in the small data area, but do not generate special code to reference them.
-msdata=use
Put small global and static data in the small data area, and generate special instructions to reference them.
-G num
Put global and static objects less than or equal to
num
bytes into the small data or BSS sections instead of the normal data or BSS sections. The default value ofnum
is 8. The-msdata
option must be set to one of ‘sdata
’ or ‘use
’ for this option to have any effect.All modules should be compiled with the same
-G num
value. Compiling with different values ofnum
may or may not work; if it doesn’t the linker gives an error message—incorrect code is not generated.-mdebug
Makes the M32R-specific code in the compiler display some statistics that might help in debugging programs.
-malign-loops
Align all loops to a 32-byte boundary.
-mno-align-loops
Do not enforce a 32-byte alignment for loops. This is the default.
-missue-rate=number
Issue
number
instructions per cycle.number
can only be 1 or 2.-mbranch-cost=number
number
can only be 1 or 2. If it is 1 then branches are preferred over conditional code, if it is 2, then the opposite applies.-mflush-trap=number
Specifies the trap number to use to flush the cache. The default is 12. Valid numbers are between 0 and 15 inclusive.
-mno-flush-trap
Specifies that the cache cannot be flushed by using a trap.
-mflush-func=name
Specifies the name of the operating system function to call to flush the cache. The default is ‘
_flush_cache
’, but a function call is only used if a trap is not available.-mno-flush-func
Indicates that there is no OS function for flushing the cache.
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