The SM86 lowering keeps the uniform registers in the general registers after the highest one the program uses
(HighestGpr), with one spare so pairs stay aligned. The scan read the register fields as single registers, so a
128-bit load or store whose upper registers the program names nowhere else (LDG, LDS, LDL and STG, STS, STL with size
6) left Rd+2 and Rd+3 to UR0 and UR1, and the load overwrote them. The scan now counts Rd..Rd+3 (Rd..Rd+1 for 64 bits)
of these forms. An overestimate only moves the uniform registers up.
Checked: no translation changes in the game's 520 task and mesh programs, its 4,238 NVN2 compute programs, or the
2,450 vertex and fragment programs whose stored input id starts with 0, all from an installed shader cache, and all
pass spirv-val (vulkan1.3): the case does not occur in what this game version has shown so far.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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