Commit 82f1d592fa

@@ -4769,7 +4769,7 @@ Error type_is_nonnull_ptr2(CodeGen *g, ZigType *type, bool *result) {
     return ErrorNone;
 }
 
-static uint32_t get_async_frame_align_bytes(CodeGen *g) {
+uint32_t get_async_frame_align_bytes(CodeGen *g) {
     // Due to how the frame structure is built the minimum alignment is the one
     // of a usize (or pointer).
     // label (grep this): [fn_frame_struct_layout]

@@ -47,6 +47,7 @@ ZigType *get_test_fn_type(CodeGen *g);
 ZigType *get_any_frame_type(CodeGen *g, ZigType *result_type);
 bool handle_is_ptr(CodeGen *g, ZigType *type_entry);
 Error emit_error_unless_callconv_allowed_for_target(CodeGen *g, AstNode *source_node, CallingConvention cc);
+uint32_t get_async_frame_align_bytes(CodeGen *g);
 
 bool type_has_bits(CodeGen *g, ZigType *type_entry);
 Error type_has_bits2(CodeGen *g, ZigType *type_entry, bool *result);

@@ -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"));

@@ -2136,7 +2136,9 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
         \\}
         \\fn func() callconv(.Async) void {}
     , &[_][]const u8{
-        "tmp.zig:4:21: error: expected type '[]align(16) u8', found '*[64]u8'",
+        // Split the check in two as the alignment value is target dependent.
+        "tmp.zig:4:21: error: expected type '[]align(",
+        ") u8', found '*[64]u8'",
     });
 
     cases.add("atomic orderings of fence Acquire or stricter",