GPU/Shader Instruction Set: Difference between revisions
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There are 3 global index registers : idx1, idx2 and idx3 = lcnt (loop counter). For format 1 instructions, when IDX != 0, the value of the corresponding index is added to SRC1's value. | There are 3 global index registers : idx1, idx2 and idx3 = lcnt (loop counter). For format 1 instructions, when IDX != 0, the value of the corresponding index is added to SRC1's value. | ||
For example, if IDX = 2, idx2 = 3 and SRC1 = c8, then instead SRC1+ | For example, if IDX = 2, idx2 = 3 and SRC1 = c8, then instead SRC1+idx2 = c11 will be used for the instruction. | ||
idx1 and idx2 can be set manually through the SETINDEX instruction. lcnt is set automatically by the LOOP instruction. Note that lcnt is still accessible and valid after exiting a LOOP block. | idx1 and idx2 can be set manually through the SETINDEX instruction. lcnt is set automatically by the LOOP instruction. Note that lcnt is still accessible and valid after exiting a LOOP block. | ||