On Fri, 2013-08-30 at 16:49 +0200, Rainer Orth wrote:
> Torvald Riegel <trie...@redhat.com> writes:
>
> > On Mon, 2013-08-26 at 09:49 -0700, Richard Henderson wrote:
> >> On 08/22/2013 02:57 PM, Torvald Riegel wrote:
> >> > On Thu, 2013-08-22 at 12:05 -0700, Richard Henderson wrote:
> >> >> On 08/22/2013 11:39 AM, Torvald Riegel wrote:
> >> >>> + /* Store edi for future HTM fast path retries. We use a stack
> >> >>> slot
> >> >>> + lower than the jmpbuf so that the jmpbuf's rip field will
> >> >>> overlap
> >> >>> + with the proper return address on the stack. */
> >> >>> + movl %edi, -64(%rsp)
> >> >>
> >> >> You havn't allocated the stack frame here, and you're storing
> >> >> outside the redzone. This is invalid.
> >> >>
> >> >> Two possibilities:
> >> >>
> >> >> (1) always allocate the stack frame on entry to
> >> >> the function (adds two register additions to
> >> >> the htm fast path -- in the noise i'd think)
> >> >>
> >> >> (2) store the edi value in the non-htm path, with
> >> >> the pr_HTMRetryableAbort bit or'd in. (adds an
> >> >> extra store to the non-htm path; probably noise).
> >> >> You'd want to mask out that bit when you reload it.
> >> >
> >> > Oops. Picked fix (2). Better now?
> >> >
> >>
> >> Move the andl of edi down into the HAVE_AS_RTM block, above the orl of
> >> HTMRetriedAfterAbort. Ok with that change.
> >
> > Committed as r202101.
> >
>
> The patch has broken Solaris/x86 bootstrap:
Sorry about that. I'll try to remember to test on non-Linux / non-futex
systems too next time. I committed the attached patch as r202116.
(Please note that I'll be offline for two weeks starting in about an
hour (yes, bad timing), so I hope I didn't miss anything else...)
Torvald
commit 29006efcecde6ec0366f6c88a662d30b9efb931f
Author: torvald <torvald@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri Aug 30 17:13:05 2013 +0000
libitm: Fix wrong initialization order introduced with r202101.
* config/posix/rwlock.cc: Fix initialization order.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202116
138bc75d-0d04-0410-961f-82ee72b054a4
diff --git a/libitm/config/posix/rwlock.cc b/libitm/config/posix/rwlock.cc
index 488e9c2..61b6ad9 100644
--- a/libitm/config/posix/rwlock.cc
+++ b/libitm/config/posix/rwlock.cc
@@ -30,11 +30,11 @@ namespace GTM HIDDEN {
// ??? Move this back to the header file when constexpr is implemented.
gtm_rwlock::gtm_rwlock()
- : mutex (PTHREAD_MUTEX_INITIALIZER),
+ : summary (0),
+ mutex (PTHREAD_MUTEX_INITIALIZER),
c_readers (PTHREAD_COND_INITIALIZER),
c_writers (PTHREAD_COND_INITIALIZER),
c_confirmed_writers (PTHREAD_COND_INITIALIZER),
- summary (0),
a_readers (0),
w_readers (0),
w_writers (0)
