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* [Bug c/31469] New: move_by_pieces in expr.c function bug
@ 2007-04-04 15:13 omer dot medan at gmail dot com
2007-04-04 15:51 ` [Bug middle-end/31469] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: omer dot medan at gmail dot com @ 2007-04-04 15:13 UTC (permalink / raw)
To: gcc-bugs
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The function move_by_pieces in expr.c enters to endless loop when the backend
defines the sizes of all data types to be the same size (aka CHAR_TYPE_SIZE
= SHORT_TYPE_SIZE = INT_TYPE_SIZE = anyvalue
).
The loop itself occurs in this code section -
while (max_size > 1)
{
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
if (mode == VOIDmode)
break;
icode = mov_optab->handlers[(int) mode].insn_code;
if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
move_by_pieces_1 (GEN_FCN (icode), mode, &data);
max_size = GET_MODE_SIZE (mode);
}
The idea here is to decrease the sizes of copying insn, or something like that,
But what if it isnt decreasing?
Thanks.
--
Summary: move_by_pieces in expr.c function bug
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: omer dot medan at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31469
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/31469] move_by_pieces in expr.c function bug
2007-04-04 15:13 [Bug c/31469] New: move_by_pieces in expr.c function bug omer dot medan at gmail dot com
@ 2007-04-04 15:51 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-04-04 15:51 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
Component|c |middle-end
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31469
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2007-04-04 15:13 [Bug c/31469] New: move_by_pieces in expr.c function bug omer dot medan at gmail dot com
2007-04-04 15:51 ` [Bug middle-end/31469] " pinskia at gcc dot gnu dot org
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