Commit fcac8617b4

Lukas Lalinsky <lukas@lalinsky.com>
2025-10-09 08:52:52
Add missing clobbers to context switching
This only shows in release mode, the compiler tries to preserve some value in rdi, but that gets replaced inside the fiber. This would not happen in the C calling convention, but in these normal Zig functions, it can happen.
master
1 parent 7d47811
Changed files (1)
lib
std
Io
EventLoop.zig
lib/std/Io/EventLoop.zig
@@ -644,6 +644,7 @@ inline fn contextSwitch(message: *const SwitchMessage) *const SwitchMessage {
             : [received_message] "={x1}" (-> *const @FieldType(SwitchMessage, "contexts")),
             : [message_to_send] "{x1}" (&message.contexts),
             : .{
+              .x0 = true,
               .x1 = true,
               .x2 = true,
               .x3 = true,
@@ -745,6 +746,7 @@ inline fn contextSwitch(message: *const SwitchMessage) *const SwitchMessage {
               .rdx = true,
               .rbx = true,
               .rsi = true,
+              .rdi = true,
               .r8 = true,
               .r9 = true,
               .r10 = true,