info gcc

3.17.26 SH Options

These ‘-m’ options are defined for the SH implementations:

@gcctabopt -m1: Generate code for the SH1.
@gcctabopt -m2: Generate code for the SH2.
@gcctabopt -m2e: Generate code for the SH2e.
@gcctabopt -m3: Generate code for the SH3.
@gcctabopt -m3e: Generate code for the SH3e.
@gcctabopt -m4-nofpu: Generate code for the SH4 without a floating-point unit.
@gcctabopt -m4-single-only: Generate code for the SH4 with a floating-point unit that only supports single-precision arithmetic.
@gcctabopt -m4-single: Generate code for the SH4 assuming the floating-point unit is in single-precision mode by default.
@gcctabopt -m4: Generate code for the SH4.
@gcctabopt -m4a-nofpu: Generate code for the SH4al-dsp, or for a SH4a in such a way that the floating-point unit is not used.
@gcctabopt -m4a-single-only: Generate code for the SH4a, in such a way that no double-precision floating point operations are used.
@gcctabopt -m4a-single: Generate code for the SH4a assuming the floating-point unit is in single-precision mode by default.
@gcctabopt -m4a: Generate code for the SH4a.
@gcctabopt -m4al: Same as ‘-m4a-nofpu’, except that it implicitly passes ‘-dsp’ to the assembler. GCC doesn't generate any DSP instructions at the moment.
@gcctabopt -mb: Compile code for the processor in big endian mode.
@gcctabopt -ml: Compile code for the processor in little endian mode.
@gcctabopt -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’.
@gcctabopt -mrelax: Shorten some address references at link time, when possible; uses the linker option ‘-relax’.
@gcctabopt -mbigtable: Use 32-bit offsets in switch tables. The default is to use 16-bit offsets.
@gcctabopt -mfmovd: Enable the use of the instruction fmovd.
@gcctabopt -mhitachi: Comply with the calling conventions defined by Renesas.
@gcctabopt -mrenesas: Comply with the calling conventions defined by Renesas.
@gcctabopt -mno-renesas: Comply with the calling conventions defined for GCC before the Renesas conventions were available. This option is the default for all targets of the SH toolchain except for ‘sh-symbianelf’.
@gcctabopt -mnomacsave: Mark the MAC register as call-clobbered, even if ‘-mhitachi’ is given.
@gcctabopt -mieee: Increase IEEE-compliance of floating-point code.
@gcctabopt -misize: Dump instruction size and location in the assembly code.
@gcctabopt -mpadstruct: This option is deprecated. It pads structures to multiple of 4 bytes, which is incompatible with the SH ABI.
@gcctabopt -mspace: Optimize for space instead of speed. Implied by ‘-Os’.
@gcctabopt -mprefergot: When generating position-independent code, emit function calls using the Global Offset Table instead of the Procedure Linkage Table.
@gcctabopt -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*.

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