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ac/nir: fix indexing GS inputs with non-constant vertex index on gfx9-11

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This hasn't been reproducible because RADV and GLSL always lower
non-constant slot and vertex indexing of GS inputs, but we'll stop
lowering it.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36018>
This commit is contained in:
Marek Olšák
2025-07-10 11:01:30 -04:00
committed by Marge Bot
parent ff9abae31e
commit 3bc31c307f
1 changed files with 2 additions and 2 deletions
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src/amd/common/nir/ac_nir_lower_esgs_io_to_mem.c
+2 -2
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@@ -242,9 +242,9 @@ gs_per_vertex_input_vertex_offset_gfx9(nir_builder *b, lower_esgs_io_state *st,
for (unsigned i = 1; i < b->shader->info.gs.vertices_in; i++) {
nir_def *cond = nir_ieq_imm(b, vertex_src->ssa, i);
nir_def *elem = gs_get_vertex_offset(b, st, i / 2u * 2u);
nir_def *elem = gs_get_vertex_offset(b, st, i / 2u);
if (i % 2u)
elem = nir_ishr_imm(b, elem, 16u);
elem = nir_ushr_imm(b, elem, 16u);
vertex_offset = nir_bcsel(b, cond, elem, vertex_offset);
}