https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
H.J. Lu hjl.tools at gmail dot com changed:
What|Removed |Added
Status|UNCONFIRMED |WAITING
Last
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #3 from Evgeniy Dushistov dushistov at mail dot ru ---
So step to reproduce:
1)Download attachment
2)Extract
tar xvf dummy_hash.tar
3)Build
cd dummy_hash make
4)Run
./thash
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
Andrew Pinski pinskia at gcc dot gnu.org changed:
What|Removed |Added
Status|WAITING |RESOLVED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #2 from Evgeniy Dushistov dushistov at mail dot ru ---
(In reply to H.J. Lu from comment #1)
Which gcc did you use? Please provide a run-time test.
I try gcc 4.6.4, 4.7.4, 4.9.2, 5.1.0.
If you compile attachment on linux/amd64 and
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
Markus Trippelsdorf trippels at gcc dot gnu.org changed:
What|Removed |Added
CC|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #6 from Evgeniy Dushistov dushistov at mail dot ru ---
(In reply to Andrew Pinski from comment #5)
C standard says this is undefined code.
Where? there is two issues aliasing (but I use -fno-strict-aliasing),
and alignment, c99 of
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #7 from Markus Trippelsdorf trippels at gcc dot gnu.org ---
6.3.2.3 p7:
»A pointer to an object type may be converted to a pointer to a different
object type. If the resulting pointer is not correctly aligned for the
referenced type,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #9 from Andrew Pinski pinskia at gcc dot gnu.org ---
(In reply to Evgeniy Dushistov from comment #8)
(In reply to Markus Trippelsdorf from comment #7)
6.3.2.3 p7:
»A pointer to an object type may be converted to a pointer to a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #8 from Evgeniy Dushistov dushistov at mail dot ru ---
(In reply to Markus Trippelsdorf from comment #7)
6.3.2.3 p7:
»A pointer to an object type may be converted to a pointer to a different
object type. If the resulting pointer is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #10 from Evgeniy Dushistov dushistov at mail dot ru ---
ABI requirements are not C requirements always. This paragraph is talking
about memory accesses but really it did not take into account other
requirements of C correctly.
But
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