ABB 26390582-BM DSTK 129 Cable connection unit

Read data is 32 bits, based on the data format in the instruction or resource. Float or normalized data is returned as floats; integer formats are returned as integers (signed or unsigned, same type as the memory storage format). Memory reads of data in memory that is 32 or 64 bits do not undergo any format conversion. Atomics with Return : Data is read out of the VGPR(s) starting at VDATA to supply to the atomic operation. If the atomic returns a value to VGPRs, that data is returned to those same VGPRs starting at VDATA..The amount and type of data that is read or written is controlled by the following: the resource format field, destination-component-selects (dst_sel), and the opcode. FORMAT can come from the resource, instruction fields, or the opcode itself. Dst_sel comes from the resource, but is ignored for many operations.

Data format derived 

The data format is derived from the opcode and ignores the resource definition. For example, buffer_load_ubyte sets the data-format to 8 and number-format to uint.  The resource’s data format must not be INVALID; that format has specific meaning (unbound resource), and for that case the data format is not replaced by the instruction’s implied data format. DST_SEL identity : Depending on the number of components in the data-format, this is: X000, XY00, XYZ0, or XYZW. The MTBUF derives the data format from the instruction. The MUBUF BUFFER_LOAD_FORMAT and BUFFER_STORE_FORMAT instructions use dst_sel from the resource; other MUBUF instructions derive data-format from the instruction itself.

Buffer Addressing 

A buffer is a data structure in memory that is addressed with an index and an offset. The index points to a particular record of size stride bytes, and the offset is the byte-offset within the record. The stride comes from the resource, the index from a VGPR (or zero), and the offset from an SGPR or VGPR and also from the instruction itself.D16 Instructions : Load-format and store-format instructions also come in a "d16" variant. For stores, each 32-bit VGPR holds two 16-bit data elements that are passed to the texture unit. This texture unit converts them to the texture format before writing to memory. For loads, data returned from the texture unit is converted to 16 bits, and a pair of data are stored in each 32-bit VGPR (LSBs first, then MSBs). Control over int vs. float is controlled by FORMAT.

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