Hi Guys!
Transactional Memory will be released in 4.7 so even if it is
experimental, I hope it will come with only few bugs in it. Users could
be enthusiastic to test it so it could be great to offer them a great
experience.
Here a list of known bugs for trans-mem. I have tried to sort it by
priority (highest first).
* Stack save/restore not working? -> XFAIL testcases
Related to this:
ICE: verify_gimple failed: invalid rhs for gimple memory store with
-fgnu-tm --param tm-max-aggregate-size=32
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51472
[trans-mem] save/restore of thread-local data in nested txns is missing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49581
* Caller-save happens on _ITM_beginTransaction
([trans-mem] Segfault in libitm when compiling with -O2)
-> Fix proposed but probably not optimal.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48625
* [trans-mem] problem with TM clone aliases
Leads to add _ITM_getTMCloneOrIrrevocable in a __transaction_atomic.
-> Fix proposed.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51516
* ICE: in function_and_variable_visibility, at ipa.c:835 with -O
-fgnu-tm and overriding virtual transaction_safe function
-> Fix proposed.
http://gcc.gnu.org/ml/gcc-patches/2011-12/msg01182.html
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51411
* ICE: verify_flow_info failed: BB 3 can not throw but has an EH edge
with -fgnu-tm -fnon-call-exceptions and transaction_callable
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51212
* ICE when lto1 does not have -fgnu-tm and object file uses TM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51280
* AIX unexpected error_mark node in new TM tests
-> Probably already fixed?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51174
Probably should be closed:
* libitm failures
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51124
* infinite loop when compiling
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48075
Fixed but still open:
* ICE: vector VEC(inline_summary_t,base) index domain error, in
inline_summary at ipa-inline.h:193 with -O -fgnu-tm, transaction_safe
and overloaded contructor
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51273
* ICE: SIGSEGV in ix86_init_builtins (i386.c:27691) with -fgnu-tm and
any fortran code
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51291
I hope this message could help. Do not hesitate to complete the list (I
can try to have a look at it) or close bugs (I cannot do it).
I take the opportunity of this message to thank Richard, Aldy and
Torvald for the work done on trans-mem.
Patrick Marlier.
