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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)