From 8bfb139033de000791725f0aa13b95b6b3ffaf26 Mon Sep 17 00:00:00 2001
From: Kenneth Graunke <kenneth@whitecape.org>
Date: Mon, 13 Apr 2026 12:34:26 -0700
Subject: [PATCH] jay: Make lower_immediates bail if there are no sources

For example, JAY_OPCODE_PRELOAD has no sources.  Reading src[other]
would read uninitialized data.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40960>
---
 src/intel/compiler/jay/jay_lower_pre_ra.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/intel/compiler/jay/jay_lower_pre_ra.c b/src/intel/compiler/jay/jay_lower_pre_ra.c
index d71ea7c3711..28e828a3886 100644
--- a/src/intel/compiler/jay/jay_lower_pre_ra.c
+++ b/src/intel/compiler/jay/jay_lower_pre_ra.c
@@ -143,6 +143,9 @@ try_swap_src01(jay_inst *I)
 static void
 lower_immediates(jay_builder *b, jay_inst *I, struct hash_table_u64 *constants)
 {
+   if (I->num_srcs == 0)
+      return;
+
    /* Canonicalize compare-with-zero to increase freedom */
    if (I->op == JAY_OPCODE_CMP &&
        jay_is_zero(I->src[1]) &&