fix(vmi): 256-lane vgather iota signless + opt-in bitcast layout_hint - #1487
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liuzidi wants to merge 3 commits into
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fix(vmi): 256-lane vgather iota signless + opt-in bitcast layout_hint#1487liuzidi wants to merge 3 commits into
liuzidi wants to merge 3 commits into
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1. createScalarOffsetConstant / createIotaChunkBase: unsigned scalar
constants and offset adds must round-trip through signless integer
types of the same width (bit-identical); the 256-lane iota chunk
split previously emitted arith.constant :ui16 / ui16 arith.addi,
failing vmi-to-vpto with 'integer return type must be signless'
for every 256-lane vgather on a ui16 index ramp.
2. Opt-in layout soft preference: a layout_hint attribute on
vinterpret_cast (forwarded to the lowered bitcast) appends its
layout pair as an extra candidate relation in
VMIBitcastTransfer::query. Soft semantics only — the solver may
reject the candidate when other constraints conflict, so the
global layout heuristics are untouched (lit suite verified
identical before/after). Includes the opt-in {bits<32>, N<128>,
d(4), c()} ensure_layout row consumed by hinted conversions.
Refs hw-native-sys#1486
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Refs #1486（完整背景、最小复现与实测数据见 issue）。
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