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/GCC 7

6.60.11 Blackfin Built-in Functions

Currently, there are two Blackfin-specific built-in functions. These are used for generating CSYNC and SSYNC machine insns without using inline assembly; by using these built-in functions the compiler can automatically add workarounds for hardware errata involving these instructions. These functions are named as follows:

void __builtin_bfin_csync (void)
void __builtin_bfin_ssync (void)

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