Gcc/10.2.0/gcc/Raw-read 002fwrite-Functions

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6.60.14.4 Raw Read/Write Functions

This sections describes built-in functions related to read and write instructions to access memory. These functions generate membar instructions to flush the I/O load and stores where appropriate, as described in Fujitsu’s manual described above.

unsigned char __builtin_read8 (void *data)

unsigned short __builtin_read16 (void *data)

unsigned long __builtin_read32 (void *data)

unsigned long long __builtin_read64 (void *data)

void __builtin_write8 (void *data, unsigned char datum)

void __builtin_write16 (void *data, unsigned short datum)

void __builtin_write32 (void *data, unsigned long datum)

void __builtin_write64 (void *data, unsigned long long datum)