GE IS200TREGH5B Logical Sequence Card

Workgroups Work-groups are collections of wavefronts running on the same workgroup processor which can synchronize and share data. Up to 1024 work-items (16 wave64’s or 32 wave32’s) can be combined into a work-group. When multiple wavefronts are in a workgroup, the S_BARRIER instruction can be used to force each wavefront to wait until all other wavefronts reach the same instruction; then, all wavefronts continue. Any wavefront may terminate early using S_ENDPGM, and the barrier is considered satisfied when the remaining live waves reach their barrier instruction.

Subvector looping imposes a rule that the “body code” cannot let the working half of the exec mask go to zero. If it might go to zero, it must be saved at the start of the loop and be restored before the end since the S_SUBVECTOR_LOOP_* instructions determine which pass they’re in by looking at which half of EXEC is zero.

Data Dependency Resolution

 Shader hardware resolves most data dependencies, but a few cases must be explicitly handled by the shader program. In these cases, the program must insert S_WAITCNT instructions to ensure that previous operations have completed before continuing. The shader has four counters that track the progress of issued instructions. S_WAITCNT waits for the values of these counters to be at, or below, specified values before continuing. These allow the shader writer to schedule long-latency instructions, execute unrelated work, and specify when results of long-latency operations are needed.

Instructions of a given type return in order

 but instructions of different types can complete outof-order. For example, both GDS and LDS instructions use LGKM_cnt, but they can return outof-order. VMEM loads return in the order they were issued, but loads and stores are unordered with each other. VM_CNT Vector memory count (reads, atomic with return). Determines when memory reads have returned data to VGPRs. • Incremented every time a vector-memory read or atomic-with-return (MIMG, MUBUF, MTBUF, or FLAT/Scratch/Global format) instruction is issued. • Decremented for reads when the data has been written back to the VGPRs.

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