From a84c12414c3681e0ac63e86ff4d0b6c3fe7c8b32 Mon Sep 17 00:00:00 2001
From: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Date: Mon, 13 Apr 2026 17:14:37 +0300
Subject: [PATCH] brw: don't support frontfacing ternary optimization on !=
 32bit

Fix shader compilation on Crimson Desert :

  16    %1995 = b32csel %1992, %1993, %1994

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40931>
---
 src/intel/compiler/brw/brw_from_nir.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/intel/compiler/brw/brw_from_nir.cpp b/src/intel/compiler/brw/brw_from_nir.cpp
index 986ead9f8df..ccd51256ac8 100644
--- a/src/intel/compiler/brw/brw_from_nir.cpp
+++ b/src/intel/compiler/brw/brw_from_nir.cpp
@@ -521,6 +521,9 @@ optimize_frontfacing_ternary(nir_to_brw_state &ntb,
    const intel_device_info *devinfo = ntb.devinfo;
    brw_shader &s = ntb.s;
 
+   if (instr->def.bit_size != 32)
+      return false;
+
    nir_intrinsic_instr *src0 = nir_src_as_intrinsic(instr->src[0].src);
    if (src0 == NULL || src0->intrinsic != nir_intrinsic_load_front_face)
       return false;