This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: PR65416, alloca on xtensa


On Fri, Mar 13, 2015 at 03:56:38PM -0500, Segher Boessenkool wrote:
> On Fri, Mar 13, 2015 at 11:36:47PM +0300, Max Filippov wrote:
> > >> 2. alloca seems to make an additional 16-bytes padding to each stack
> > >>   allocation: alloca(1) results in moving sp down by 32 bytes, alloca(17)
> > >>   moves it by 48 bytes, etc.
> > >
> > > This sounds like PR 50938, 47353, 34548, maybe more?  Happens on most
> > > targets.
> > 
> > Exactly! (And I was wrong about 1 byte, it needs at least 2 for 32
> > bytes result).
> 
> Yeah, same bug :-)
> 
> > But...those PRs are marked as duplicates of a fixed PR 34548.
> > Looks like it's not fixed or there's a regression?
> 
> It's not fixed.  Removing the STACK_POINTER_OFFSET check from
> allocate_dynamic_stack_check fixes it, but is probably not good

allocate_dynamic_stack_space I mean.

> for all targets ;-)
> 
> 50938 is still open.
> 
> 
> Segher


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]