[Bug tree-optimization/39100] [4.4 Regression] -fstrict-aliasing miscompilation

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #8 from rguenth at gcc dot gnu dot org  2009-02-04 21:36 -------
The following works (on the branch, with added NONLOCAL = *NONLOCAL
constraint):

ANYTHING = &ANYTHING
READONLY = &READONLY
ESCAPED = *ESCAPED
ESCAPED = ESCAPED + UNKNOWN
*ESCAPED = NONLOCAL
NONLOCAL = &NONLOCAL
NONLOCAL = &ESCAPED
NONLOCAL = *NONLOCAL
CALLUSED = *CALLUSED
CALLUSED = CALLUSED + UNKNOWN
INTEGER = &ANYTHING
x = &NONLOCAL
nl = &NULL
n_5 = *x_1
*na_2 = x_1
ESCAPED = x_1
D.1242_6 = *na_2
na_7 = D.1242_6
x_1 = x
x_1 = n_5
na_2 = &nl
na_2 = na_7
derefaddrtmp.7 = &NULL
*na_2 = derefaddrtmp.7
ESCAPED = &NULL

...

NULL = { }
ANYTHING = { ANYTHING }
READONLY = { READONLY }
ESCAPED = same as n_5
NONLOCAL = same as n_5
CALLUSED = { }
INTEGER = { ANYTHING }
x = { NONLOCAL }
nl = { NULL ESCAPED NONLOCAL }
n_5 = { NULL ESCAPED NONLOCAL }
x_1 = same as n_5
na_2 = { NULL ESCAPED NONLOCAL nl }
D.1242_6 = { NULL ESCAPED NONLOCAL }
na_7 = same as D.1242_6
derefaddrtmp.7 = { NULL }


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39100