Only the lines this branch added lose their comments; the commits before
keep them, with the reasoning behind each change, for whoever digs into
that code later.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The decoder puts an instruction's DPP fields on its source, and only a
destination carrying them has writeRawU32 keep the lanes the masks leave out
(and, without bound_ctrl, the lanes with no source lane). destinationOperand
copied them over, but no write used it, so every row was written: a wave64
scan adding the other row's total into the odd rows only (row_mask:0xa) added
it into every row, the prefix sums a key pass indexes primitives by came out
wrong, and the tree built from the keys held cycles its walkers looped on.
As in the Kyty recompiler (writes through DestinationOperand):
TranslateInstruction gives the destination its source's DPP fields once, and
a mac accumulator reads the destination without them (accumulatorOperand).
agc_dpp_write_tests checks a masked DPP add writes through DppUpdateU32.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
STL1te