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

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#### 6.58.11.5 Other Built-in Functions

This section describes built-in functions that are not named after a specific FR-V instruction.

`sw2 __IACCreadll (iacc reg)`

  Return the full 64-bit value of IACC0. The reg argument is reserved for future expansion and must be 0.

`sw1 __IACCreadl (iacc reg)`

  Return the value of IACC0H if reg is 0 and IACC0L if reg is 1. Other values of reg are rejected as invalid.

`void __IACCsetll (iacc reg, sw2 x)`

  Set the full 64-bit value of IACC0 to x. The reg argument is reserved for future expansion and must be 0.

`void __IACCsetl (iacc reg, sw1 x)`

  Set IACC0H to x if reg is 0 and IACC0L to x if reg is 1. Other values of reg are rejected as invalid.

`void __data_prefetch0 (const void *x)`

  Use the `dcpl` instruction to load the contents of address x into the data cache.

`void __data_prefetch (const void *x)`

  Use the `nldub` instruction to load the contents of address x into the data cache. The instruction is issued in slot I1.