AMD has released the "Vega" 7nm Instruction Set Architecture in PDF form. They have been releasing GPU ISA documentation for some time now, and now they've added the 7nm architecture to the list.

In the ISA documentation you will find:

• Chapter 1 begins the document begins with an overview of the AMD GCN processors’ hardware and programming environment.
• Chapter 2 describes the organization of GCN programs.
• Chapter 3 describes the program state that is maintained.
• Chapter 4 describes the program flow.
• Chapter 5 describes the scalar ALU operations.
• Chapter 6 describes the vector ALU operations.
• Chapter 7 describes the scalar memory operations.
• Chapter 8 describes the vector memory operations.
• Chapter 9 provides information about the flat memory instructions.
• Chapter 10 describes the data share operations.
• Chapter 11 describes exporting the parameters of pixel color and vertex shaders.
• Chapter 12 describes instruction details, first by the microcode format to which they belong,
• Chapter 13 provides a detailed specification of each microcode format.

Read the documentation here.