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(gcc-295.info)RT Options

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IBM RT Options
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   These `-m' options are defined for the IBM RT PC:

`-min-line-mul'
     Use an in-line code sequence for integer multiplies.  This is the
     default.

`-mcall-lib-mul'
     Call `lmul$$' for integer multiples.

`-mfull-fp-blocks'
     Generate full-size floating point data blocks, including the
     minimum amount of scratch space recommended by IBM.  This is the
     default.

`-mminimum-fp-blocks'
     Do not include extra scratch space in floating point data blocks.
     This results in smaller code, but slower execution, since scratch
     space must be allocated dynamically.

`-mfp-arg-in-fpregs'
     Use a calling sequence incompatible with the IBM calling
     convention in which floating point arguments are passed in
     floating point registers.  Note that `varargs.h' and `stdargs.h'
     will not work with floating point operands if this option is
     specified.

`-mfp-arg-in-gregs'
     Use the normal calling convention for floating point arguments.
     This is the default.

`-mhc-struct-return'
     Return structures of more than one word in memory, rather than in a
     register.  This provides compatibility with the MetaWare HighC (hc)
     compiler.  Use the option `-fpcc-struct-return' for compatibility
     with the Portable C Compiler (pcc).

`-mnohc-struct-return'
     Return some structures of more than one word in registers, when
     convenient.  This is the default.  For compatibility with the
     IBM-supplied compilers, use the option `-fpcc-struct-return' or the
     option `-mhc-struct-return'.