From fca748ffba4518a205e3ebb46ff6ea062dc5fdcc Mon Sep 17 00:00:00 2001
From: GasInfinity <me@gasinfinity.dev>
Date: Wed, 29 Oct 2025 14:34:58 +0100
Subject: [PATCH] fix: add `i86` cpu in `update_cpu_features`

---
 lib/std/Target/x86.zig        | 4 +++-
 tools/update_cpu_features.zig | 7 +++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/std/Target/x86.zig b/lib/std/Target/x86.zig
index fb76bb757f..94dad2a673 100644
--- a/lib/std/Target/x86.zig
+++ b/lib/std/Target/x86.zig
@@ -3084,7 +3084,9 @@ pub const cpu = struct {
     pub const @"i86": CpuModel = .{
         .name = "i86",
         .llvm_name = null,
-        .features = featureSet(&[_]Feature{}),
+        .features = featureSet(&[_]Feature{
+            .@"16bit_mode",
+        }),
     };
     pub const @"i386": CpuModel = .{
         .name = "i386",
diff --git a/tools/update_cpu_features.zig b/tools/update_cpu_features.zig
index 29877fff15..c077b16c0a 100644
--- a/tools/update_cpu_features.zig
+++ b/tools/update_cpu_features.zig
@@ -1541,6 +1541,13 @@ const targets = [_]ArchTarget{
                 .deps = &.{},
             },
         },
+        .extra_cpus = &.{
+            .{
+                .llvm_name = null,
+                .zig_name = "i86",
+                .features = &.{"16bit_mode"},
+            },
+        },
         .omit_cpus = &.{
             // LLVM defines a bunch of dumb aliases with foreach loops in X86.td.
             "pentium_mmx",