aco: prevent infinite recursion in RA for subdword variables

Cc: 20.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6024>

diff --git a/src/amd/compiler/aco_register_allocation.cpp b/src/amd/compiler/aco_register_allocation.cpp
index a59a9af7add64501e06bbd023a1c7888f080d674..2fd8d3d66d509fa3807d1274504bec01922d63c1 100644 (file)
--- a/src/amd/compiler/aco_register_allocation.cpp
+++ b/src/amd/compiler/aco_register_allocation.cpp
@@ -591,7 +591,7 @@ std::pair<PhysReg, bool> get_reg_simple(ra_ctx& ctx,
    RegClass rc = info.rc;
 
    if (stride == 1) {
-
+      info.rc = RegClass(rc.type(), size);
       for (unsigned stride = 8; stride > 1; stride /= 2) {
          if (size % stride)
             continue;