t_id
1537
t_cpu
i386
t_adddate
2005/03/25
t_result
0
t_knownrunerror
0
t_opts
-Ogr
| tr_id | run | tr_ok | tr_skip | tr_result |
|---|---|---|---|---|
| 443849501 | 934995 | True | False | Successfully run |
Record count: 1
{ %cpu=i386 }
{ %opt=-Ogr }
{$mode delphi}
type
my_rec = record
my_field: string;
end;
var
my_fyl: my_rec;
my_str: array[0..99] of char;
function my_func(var f: my_rec):PChar;
begin
my_func:=@my_str[1];
end;
procedure my_proc(var f: my_rec; const s: String);
var i, len: Integer; wascur: PChar;
begin
len := length(s);
wascur := my_func(f);
for i:=0 to len-1 do
wascur[i]:=s[i+1];
end;
begin
my_proc(my_fyl,'xxx');
my_str[0]:='y';
writeln(my_str);
end.
{
It's a spilling bug:
# [23] wascur[i]:=s[i+1];
movl -8(%ebp),%ireg23d
# Register %ireg24d allocated
movl %ireg16d,%ireg24d
incl %ireg24d
# Register %ireg24d released
# Register %ireg25d allocated
movl %ireg24d,%ireg25d
# Register %ireg26d allocated
movl -12(%ebp),%ireg26d
# Register %ireg26d released
# Register %edi allocated
leal (%ireg26d,%ireg16d,1),%edi
# Register %ireg23d,%ireg25d released
becomes
# [23] wascur[i]:=s[i+1];
movl -8(%ebp),%edx
# Register %ecx allocated
movl -20(%ebp),%ecx
incl %ecx
# Register %eax allocated
movl -12(%ebp),%eax
# Register %eax released
# Register %edi,%eax allocated
movl -20(%ebp),%eax
# Register %eax released
leal (%eax,%eax,1),%edi
# Register %edx,%ecx released
ireg16d is spilled to -20(%ebp), so before the leal it must be loaded
into a register. The spilling code picks eax, but that one is already
used at that moment (by ireg26d).
}