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IBM
RT options
The following ‘-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:
‘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’.
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