Using the GNU Compiler Collection (GCC): Nvidia PTX Variable Attributes

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#### 6.32.10 Nvidia PTX Variable Attributes

These variable attributes are supported by the Nvidia PTX back end:

`shared`

  Use this attribute to place a variable in the `.shared` memory space. This memory space is private to each cooperative thread array; only threads within one thread block refer to the same instance of the variable. The runtime does not initialize variables in this memory space.