Other MIPS Built-in Functions - Using the GNU Compiler Collection (GCC)
Description: Using the GNU Compiler Collection (GCC)

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#### 6.58.15 Other MIPS Built-in Functions

GCC provides other MIPS-specific built-in functions:

`void __builtin_mips_cache (int` op`, const volatile void *`addr`)`
  Insert a ‘`cache`’ instruction with operands op and addr. GCC defines the preprocessor macro `___GCC_HAVE_BUILTIN_MIPS_CACHE` when this function is available.
`unsigned int __builtin_mips_get_fcsr (void)`
`void __builtin_mips_set_fcsr (unsigned int` value`)`
  Get and set the contents of the floating-point control and status register (FPU control register 31). These functions are only available in hard-float code but can be called in both MIPS16 and non-MIPS16 contexts.

  `__builtin_mips_set_fcsr` can be used to change any bit of the register except the condition codes, which GCC assumes are preserved.