diff --git a/src/etc/platform-intrinsics/x86/avx.json b/src/etc/platform-intrinsics/x86/avx.json
index 08524fbd6dd..0625ac63bf1 100644
--- a/src/etc/platform-intrinsics/x86/avx.json
+++ b/src/etc/platform-intrinsics/x86/avx.json
@@ -15,6 +15,13 @@
             "ret": "f(32-64)",
             "args": ["s8SPc"]
         },
+        {
+            "intrinsic": "256_cmp_{0.data_type}",
+            "width": [256],
+            "llvm": "cmp.{1.data_type}.256",
+            "ret": "f(32-64)",
+            "args": ["0", "0", "s8S"]
+        },
         {
             "intrinsic": "256_cvtepi32_pd",
             "width": [256],