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intel/nir: switch ray query state tracking to local variables uint16_t

Lionel Landwerlin requested to merge llandwerlin/mesa:review/intel-rt-nir-rq-no-scratch-state into main

We should be able to use uint8_t but there appears to be a backend bug.

This prevents using scratch messages to get/update the state and moves it to registers instead.

Q2RTX shader compute shader improvement with ray queries :

Totals:
Instrs: 102221 -> 101499 (-0.71%); split: -0.82%, +0.12%
Cycles: 4451260 -> 4396025 (-1.24%)
Send messages: 3587 -> 3585 (-0.06%)
Spill count: 717 -> 658 (-8.23%)
Fill count: 1248 -> 1214 (-2.72%); split: -3.21%, +0.48%
Scratch Memory Size: 21504 -> 16384 (-23.81%)

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com

Edited by Lionel Landwerlin

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