------- Comment #2 from rguenth at gcc dot gnu dot org 2009-05-20 09:20 -------
Confirmed. We endlessly recurse in folding
#2 0x000000000076b333 in fold_binary (code=BIT_AND_EXPR, type=0x7ffff5f5f540,
op0=0x7ffff7ff9580, op1=0x7ffff5f76870)
at /space/rguenther/src/svn/trunk/gcc/fold-const.c:11388
11388 return fold_build2 (BIT_AND_EXPR, type, tem,
(gdb) l
11383 TREE_OPERAND (arg0, 1));
11384 tem = fold_convert (type, tem);
11385 }
11386 else
11387 tem = op0;
11388 return fold_build2 (BIT_AND_EXPR, type, tem,
11389 build_int_cst_type (TREE_TYPE
(op1),
11390 newmask));
11391 }
11392 }
(gdb) call debug_generic_expr (op0)
(<unnamed-unsigned:4>) ((unsigned char) c >> 4)
(gdb) call debug_generic_expr (op1)
15
(gdb) call debug_generic_expr (tem)
(<unnamed-unsigned:4>) ((unsigned char) c >> 4)
(gdb) p newmask
$1 = 255
and 255 is truncated to 15 again.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c |middle-end
Ever Confirmed|0 |1
Keywords| |ice-on-valid-code
Known to fail| |4.3.3 4.4.0
Known to work| |4.2.4
Last reconfirmed|0000-00-00 00:00:00 |2009-05-20 09:20:22
date| |
Summary|segfault with bitfields in |[4.3/4.4/4.5 Regression]
|structs |segfault with bitfields in
| |structs
Target Milestone|--- |4.3.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40204
