gcc/doc/gcc/extensions-to-the-c-language-family/target-builtins/other-mips-built-in-functions.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 .. _other-mips-built-in-functions:
   7
   8 Other MIPS Built-in Functions
   9 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  10
  11 GCC provides other MIPS-specific built-in functions:
  12
  13 .. function:: void __builtin_mips_cache (int op, const volatile void *addr)
  14
  15   Insert a :samp:`cache` instruction with operands :samp:`{op}` and :samp:`{addr}`.
  16   GCC defines the preprocessor macro ``___GCC_HAVE_BUILTIN_MIPS_CACHE``
  17   when this function is available.
  18
  19 .. function:: unsigned int __builtin_mips_get_fcsr (void)
  20 .. function:: void __builtin_mips_set_fcsr (unsigned int value)
  21
  22   Get and set the contents of the floating-point control and status register
  23   (FPU control register 31).  These functions are only available in hard-float
  24   code but can be called in both MIPS16 and non-MIPS16 contexts.
  25
  26   ``__builtin_mips_set_fcsr`` can be used to change any bit of the
  27   register except the condition codes, which GCC assumes are preserved.