GNU Info
(gcc-295.info)M32R/D Options
M32R/D Options
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These `-m' options are defined for Mitsubishi M32R/D architectures:
`-mcode-model=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 the `bl' instruction. This is
the default.
The addressability of a particular object can be set with the
`model' attribute.
`-mcode-model=medium'
Assume objects may be anywhere in the 32 bit address space (the
compiler will generate `seth/add3' instructions to load their
addresses), and assume all subroutines are reachable with the `bl'
instruction.
`-mcode-model=large'
Assume objects may be anywhere in the 32 bit address space (the
compiler will generate `seth/add3' instructions to load their
addresses), and assume subroutines may not be reachable with the
`bl' instruction (the compiler will generate the much slower
`seth/add3/jl' instruction sequence).
`-msdata=none'
Disable use of the small data area. Variables will be put into
one of `.data', `bss', or `.rodata' (unless the `section'
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 the
`section' 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 of NUM 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 of NUM may or may not work; if it
doesn't the linker will give an error message - incorrect code
will not be generated.
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