These function attributes are supported by the SPU back end:
naked
asm
statements can safely be included in naked functions (see Basic Asm). While using extended asm
or a mixture of basic asm
and C code may appear to work, they cannot be depended upon to work reliably and are not supported.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/SPU-Function-Attributes.html