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(gcc-300.info)SH Options

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SH Options
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   These `-m' options are defined for the SH implementations:

`-m1'
     Generate code for the SH1.

`-m2'
     Generate code for the SH2.

`-m3'
     Generate code for the SH3.

`-m3e'
     Generate code for the SH3e.

`-m4-nofpu'
     Generate code for the SH4 without a floating-point unit.

`-m4-single-only'
     Generate code for the SH4 with a floating-point unit that only
     supports single-precision arithmetic.

`-m4-single'
     Generate code for the SH4 assuming the floating-point unit is in
     single-precision mode by default.

`-m4'
     Generate code for the SH4.

`-mb'
     Compile code for the processor in big endian mode.

`-ml'
     Compile code for the processor in little endian mode.

`-mdalign'
     Align doubles at 64-bit boundaries.  Note that this changes the
     calling conventions, and thus some functions from the standard C
     library will not work unless you recompile it first with
     `-mdalign'.

`-mrelax'
     Shorten some address references at link time, when possible; uses
     the linker option `-relax'.

`-mbigtable'
     Use 32-bit offsets in `switch' tables.  The default is to use
     16-bit offsets.

`-mfmovd'
     Enable the use of the instruction `fmovd'.

`-mhitachi'
     Comply with the calling conventions defined by Hitachi.

`-mnomacsave'
     Mark the `MAC' register as call-clobbered, even if `-mhitachi' is
     given.

`-mieee'
     Increase IEEE-compliance of floating-point code.

`-misize'
     Dump instruction size and location in the assembly code.

`-mpadstruct'
     This option is deprecated.  It pads structures to multiple of 4
     bytes, which is incompatible with the SH ABI.

`-mspace'
     Optimize for space instead of speed.  Implied by `-Os'.

`-mprefergot'
     When generating position-independent code, emit function calls
     using the Global Offset Table instead of the Procedure Linkage
     Table.

`-musermode'
     Generate a library function call to invalidate instruction cache
     entries, after fixing up a trampoline.  This library function call
     doesn't assume it can write to the whole memory address space.
     This is the default when the target is `sh-*-linux*'.