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/GCC 7

6.60.12.5 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.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Other-Built_002din-Functions.html