http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49503
--- Comment #5 from Michael Zolotukhin <michael.v.zolotukhin at gmail dot com> 2011-06-23 11:44:17 UTC --- (In reply to comment #3) > (In reply to comment #2) > > (In reply to comment #1) > > > (In reply to comment #0) > > > > > > > > As _L_mutex_lock is a function, GCC generates a prologue and epilogue > > > > for it - > > > > in prologue stack alignment is performed (according to ABI64, stack > > > > should be > > > > aligned to 128-bit). > > > > > > I didn't see any prologue and epilogue for _L_mutex_lock. Do you have > > > a run-time testcase to show the problem? > > > > I don't have run-time test for this fail, but here is a way to see the > > problem: > > > > It is very easy to check if stack alignment is correct at run-time. > Please see how it is done in testcases under gcc.dg/torture/stackalign. Please find the testcase attached. It passes on 32 bits and fails on 64 bits (4.7.0 and 4.5.1(RedHat) GCC was checked).
