Raw read/write Functions - Using the GNU Compiler Collection (GCC)
Description: Using the GNU Compiler Collection (GCC)

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##### 6.54.5.4 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`)`