Three attributes currently are defined for PowerPC configurations: altivec, ms_struct and gcc_struct.
For full documentation of the struct attributes please see the documentation in x86 Variable Attributes.
For documentation of altivec attribute please see the documentation in PowerPC Type Attributes.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/PowerPC-Variable-Attributes.html