ABB 26390603-A DSTK 150 DCS模块

Range checking determines if a given buffer memory address is in-range (valid) or out of range. When an address is out of range, writes are ignored (dropped) and reads return zero. Range checking is controlled by a 2-bit field in the buffer resource: OOB_SELECT (Out of Bounds select).

The final buffer memory address is composed of three parts: 

• the base address from the buffer resource (V#), 

• the offset from the SGPR, and 

• a buffer-offset that is calculated differently, depending on whether the buffer is linearly addressed (a simple Array-of-Structures calculation) or is swizzled.

Instruction Set Architecture

Reads that go out-of-range return zero (except for components with V#.dst_sel = SEL_1 that return 1). 

2. Writes that are out-of-range do not write anything. 

3. Load/store-format-* instruction and atomics are range-checked "all or nothing" - either entirely in or out. 

4. Load/store-Dword-x{2,3,4} and range-check per component. Swizzled Buffer Addressing Swizzled addressing rearranges the data in the buffer and can help provide improved cache locality for arrays of structures. Swizzled addressing also requires Dword-aligned accesses. The buffer’s STRIDE must be a multiple of element_size.

16-bit Memory Operations 

The D16 buffer instructions allow a kernel to load or store just 16 bits per work item between VGPRs and memory. There are two variants of these instructions: 

• D16 loads data into or stores data from the lower 16 bits of a VGPR. 

• D16_HI loads data into or stores data from the upper 16 bits of a VGPR. For example, BUFFER_LOAD_UBYTE_D16 reads a byte per work-item from memory, converts it to a 16-bit integer, then loads it into the lower 16 bits of the data VGPR.

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