From 7a8e86e46ceb1350509b4296c2a45af45100df41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Tue, 13 Aug 2024 05:26:30 +0200
Subject: [PATCH] llvm: Don't emit extra debug instructions for `dbg_var_val`
 in naked functions.

---
 src/codegen/llvm.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 23fdbb177b..1a62e89517 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -6743,7 +6743,10 @@ pub const FuncGen = struct {
                 },
                 "",
             );
-        } else if (owner_mod.optimize_mode == .Debug) {
+        } else if (owner_mod.optimize_mode == .Debug and !self.is_naked) {
+            // We avoid taking this path for naked functions because there's no guarantee that such
+            // functions even have a valid stack pointer, making the `alloca` + `store` unsafe.
+
             const alignment = operand_ty.abiAlignment(pt).toLlvm();
             const alloca = try self.buildAlloca(operand.typeOfWip(&self.wip), alignment);
             _ = try self.wip.store(.normal, operand, alloca, alignment);