gcc: MeP Pragmas

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1 6.61.4 MeP Pragmas
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1 'custom io_volatile (on|off)'
1      Overrides the command-line option '-mio-volatile' for the current
1      file.  Note that for compatibility with future GCC releases, this
1      option should only be used once before any 'io' variables in each
1      file.
1 
1 'GCC coprocessor available REGISTERS'
1      Specifies which coprocessor registers are available to the register
1      allocator.  REGISTERS may be a single register, register range
1      separated by ellipses, or comma-separated list of those.  Example:
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1           #pragma GCC coprocessor available $c0...$c10, $c28
1 
1 'GCC coprocessor call_saved REGISTERS'
1      Specifies which coprocessor registers are to be saved and restored
1      by any function using them.  REGISTERS may be a single register,
1      register range separated by ellipses, or comma-separated list of
1      those.  Example:
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1           #pragma GCC coprocessor call_saved $c4...$c6, $c31
1 
1 'GCC coprocessor subclass '(A|B|C|D)' = REGISTERS'
1      Creates and defines a register class.  These register classes can
1      be used by inline 'asm' constructs.  REGISTERS may be a single
1      register, register range separated by ellipses, or comma-separated
1      list of those.  Example:
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1           #pragma GCC coprocessor subclass 'B' = $c2, $c4, $c6
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1           asm ("cpfoo %0" : "=B" (x));
1 
1 'GCC disinterrupt NAME , NAME ...'
1      For the named functions, the compiler adds code to disable
1      interrupts for the duration of those functions.  If any functions
1      so named are not encountered in the source, a warning is emitted
1      that the pragma is not used.  Examples:
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1           #pragma disinterrupt foo
1           #pragma disinterrupt bar, grill
1           int foo () { ... }
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1 'GCC call NAME , NAME ...'
1      For the named functions, the compiler always uses a
1      register-indirect call model when calling the named functions.
1      Examples:
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1           extern int foo ();
1           #pragma call foo
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