From bfdc95b1094bbd932a1e0e8a2b8e8e2e8ca0dc87 Mon Sep 17 00:00:00 2001
From: Faith Ekstrand <faith.ekstrand@collabora.com>
Date: Mon, 26 May 2025 22:58:56 -0400
Subject: [PATCH] nak: Scalarize non-constant ald/ast on Kepler

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35190>
---
 src/nouveau/compiler/nak_nir_lower_vtg_io.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/nouveau/compiler/nak_nir_lower_vtg_io.c b/src/nouveau/compiler/nak_nir_lower_vtg_io.c
index a3b4e45bff2..4c528869c36 100644
--- a/src/nouveau/compiler/nak_nir_lower_vtg_io.c
+++ b/src/nouveau/compiler/nak_nir_lower_vtg_io.c
@@ -206,6 +206,13 @@ lower_vtg_io_intrin(nir_builder *b,
          comps = 1;
       assert(!(c_addr & 0x3));
 
+      /* Vector load/store with non-constant offsets don't work pre-Maxwell.
+       * They encode fine and they don't throw any shader exceptions but the
+       * seem to get stuck in the hardware and we get context timeouts.
+       */
+      if (nak->sm < 50 && !offset_is_const)
+         comps = 1;
+
       nir_def *c_offset = offset;
       if (flags.phys) {
          /* Physical addressing has to be scalar */