From 7513744a7a08b04768c153e16aace6e4e98a2e40 Mon Sep 17 00:00:00 2001
From: Harinn <prinn.dev@pm.me>
Date: Tue, 19 May 2026 16:20:32 +0700
Subject: [PATCH] halide: fix correctness_simd_op_check_x86 bf16 disagreement

---
 pkgs/by-name/ha/halide/package.nix | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pkgs/by-name/ha/halide/package.nix b/pkgs/by-name/ha/halide/package.nix
index c48162371c5c..1f1cbceeebb1 100644
--- a/pkgs/by-name/ha/halide/package.nix
+++ b/pkgs/by-name/ha/halide/package.nix
@@ -3,6 +3,7 @@
   stdenv,
   llvmPackages,
   fetchFromGitHub,
+  fetchpatch2,
   cmake,
   flatbuffers,
   libffi,
@@ -37,6 +38,19 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-A5EnZgXc9+L+bzWHftaL74nHmP8Jf0rnT5KJAAWvKis=";
   };
 
+  patches = [
+    # Backport: properly initialize bf16 inputs in simd_op_check.
+    (fetchpatch2 {
+      url = "https://github.com/halide/Halide/commit/acb58504f0ce02e07b8b9008668c8779d3561ec8.patch?full_index=1";
+      hash = "sha256-n9avTYe8JFYQKeJQBQQV9xoOoYp0imXD2GQgifRym/A=";
+    })
+    # Backport: add Zen4/Zen5/AVXVNNI feature flags to simd_op_check's can_run_code.
+    (fetchpatch2 {
+      url = "https://github.com/halide/Halide/commit/1b9be55dfaa162fad6a3ed3c6e8d83f966ce8af1.patch?full_index=1";
+      hash = "sha256-5f6Q2Q1pvimlFV3lCcMzIHMIze6A8TmnMjVpQ8/ceyg=";
+    })
+  ];
+
   postPatch = ''
     substituteInPlace src/runtime/CMakeLists.txt --replace-fail \
         '-isystem "''${VulkanHeaders_INCLUDE_DIR}"' \