From e83dc03b39b65c6f7e6580b3cd5025c9af319965 Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Sat, 22 Aug 2026 17:46:35 +0100
Subject: [PATCH] Fix #7420

---
 src/llvm_backend_asm.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/llvm_backend_asm.cpp b/src/llvm_backend_asm.cpp
index 6eebedf79..7a987f3c4 100644
--- a/src/llvm_backend_asm.cpp
+++ b/src/llvm_backend_asm.cpp
@@ -786,7 +786,10 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
 				return s;
 			}
 		}
-		GB_ASSERT(instr->mnemonic != 0);
+		if (instr->mnemonic == 0) {
+			// Ignore bare prefix lines
+			return 0;
+		}
 		GB_ASSERT(instr->valid_form_index >= 0);
 
 		auto forms = g_asm_amd64.encoding_forms(instr->mnemonic);