stage1: Use correct alignment for asyncCall frame

1 files changed, 6 insertions, 2 deletions

diff --git a/src/stage1/ir.cpp b/src/stage1/ir.cpp
index 176d50dc72..7edfe37c92 100644
--- a/src/stage1/ir.cpp
+++ b/src/stage1/ir.cpp
@@ -20659,8 +20659,12 @@ static IrInstGen *analyze_casted_new_stack(IrAnalyze *ira, IrInst* source_instr,
                 get_fn_frame_type(ira->codegen, fn_entry), false);
         return ir_implicit_cast(ira, new_stack, needed_frame_type);
     } else {
+        // XXX The stack alignment is hardcoded to 16 here and in
+        // std.Target.stack_align.
+        const uint32_t required_align = is_async_call_builtin ?
+                get_async_frame_align_bytes(ira->codegen) : 16;
         ZigType *u8_ptr = get_pointer_to_type_extra(ira->codegen, ira->codegen->builtin_types.entry_u8,
-                false, false, PtrLenUnknown, target_fn_align(ira->codegen->zig_target), 0, 0, false);
+                false, false, PtrLenUnknown, required_align, 0, 0, false);
         ZigType *u8_slice = get_slice_type(ira->codegen, u8_ptr);
         ira->codegen->need_frame_size_prefix_data = true;
         return ir_implicit_cast2(ira, new_stack_src, new_stack, u8_slice);
@@ -30095,7 +30099,7 @@ static IrInstGen *ir_align_cast(IrAnalyze *ira, IrInstGen *target, uint32_t alig
         fn_type_id.alignment = align_bytes;
         result_type = get_fn_type(ira->codegen, &fn_type_id);
     } else if (target_type->id == ZigTypeIdAnyFrame) {
-        if (align_bytes >= target_fn_align(ira->codegen->zig_target)) {
+        if (align_bytes >= get_async_frame_align_bytes(ira->codegen)) {
             result_type = target_type;
         } else {
             ir_add_error(ira, &target->base, buf_sprintf("sub-aligned anyframe not allowed"));