gcc/doc/gcc/gcc-command-options/machine-dependent-options/m32c-options.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. program:: M32C
   7
   8 .. index:: M32C options
   9
  10 .. _m32c-options:
  11
  12 M32C Options
  13 ^^^^^^^^^^^^
  14
  15 .. option:: -mcpu={name}
  16
  17   Select the CPU for which code is generated.  :samp:`{name}` may be one of
  18   :samp:`r8c` for the R8C/Tiny series, :samp:`m16c` for the M16C (up to
  19   /60) series, :samp:`m32cm` for the M16C/80 series, or :samp:`m32c` for
  20   the M32C/80 series.
  21
  22 .. option:: -msim
  23
  24   Specifies that the program will be run on the simulator.  This causes
  25   an alternate runtime library to be linked in which supports, for
  26   example, file I/O.  You must not use this option when generating
  27   programs that will run on real hardware; you must provide your own
  28   runtime library for whatever I/O functions are needed.
  29
  30 .. option:: -memregs={number}
  31
  32   Specifies the number of memory-based pseudo-registers GCC uses
  33   during code generation.  These pseudo-registers are used like real
  34   registers, so there is a tradeoff between GCC's ability to fit the
  35   code into available registers, and the performance penalty of using
  36   memory instead of registers.  Note that all modules in a program must
  37   be compiled with the same value for this option.  Because of that, you
  38   must not use this option with GCC's default runtime libraries.