6.60.1 AArch64 Built-in Functions

These built-in functions are available for the AArch64 family of processors.

unsigned int __builtin_aarch64_get_fpcr ()
void __builtin_aarch64_set_fpcr (unsigned int)
unsigned int __builtin_aarch64_get_fpsr ()
void __builtin_aarch64_set_fpsr (unsigned int)

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https://gcc.gnu.org/onlinedocs/gcc-7.4.0/gcc/AArch64-Built_002din-Functions.html