From 738cc6a7db2cdcd54a08314931e1f2eea3e99939 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Sch=C3=BCrmann?= <daniel@schuermann.dev>
Date: Thu, 26 Mar 2026 13:54:00 +0100
Subject: [PATCH] nir/opt_loop: stop recursion at loop header phi in
 can_constant_fold()

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40349>
---
 src/compiler/nir/nir_opt_loop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/nir/nir_opt_loop.c b/src/compiler/nir/nir_opt_loop.c
index bd4f44aa395..bbc33721897 100644
--- a/src/compiler/nir/nir_opt_loop.c
+++ b/src/compiler/nir/nir_opt_loop.c
@@ -321,7 +321,7 @@ can_constant_fold(nir_scalar scalar, nir_block *loop_header)
       nir_block *preheader = nir_block_cf_tree_prev(loop_header);
       nir_phi_instr *phi = nir_def_as_phi(scalar.def);
       nir_phi_src *src = nir_phi_get_src_from_block(phi, preheader);
-      return can_constant_fold(nir_get_scalar(src->src.ssa, 0), loop_header);
+      return nir_src_is_const(src->src);
    }
 
    return false;