Muthu kumar raj ;
> GCC Patches ; Martin Jambor
> ; Uros Bizjak (ubiz...@gmail.com)
> ; Jan Hubicka ; Dharmakan, Rohit arul raj
>
> Subject: RE: [PATCH 2/5] x86: Add -mindirect-branch-loop=
>
> > > If everyone is ok, my suggestion is to use "lfence" as the default
> > If everyone is ok, my suggestion is to use "lfence" as the default
> > loop filler for retpoline.
can we do BOTH a pause and lfence.
(that way on cpu's where pause is the power stop, it works, and on cpus where
it's a fallthrough (AMD) it goes to the lfence)
On Sat, Jan 13, 2018 at 8:34 AM, David Woodhouse wrote:
> On Sat, 2018-01-13 at 03:11 +, Kumar, Venkataramanan wrote:
>>
>> > My original patch uses "lfence". I was asked to use "pause":
>> >
>> > https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00969.html
>>
>> If everyone is ok, my suggestion
On Sat, 2018-01-13 at 03:11 +, Kumar, Venkataramanan wrote:
>
> > My original patch uses "lfence". I was asked to use "pause":
> >
> > https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00969.html
>
> If everyone is ok, my suggestion is to use "lfence" as the default
> loop filler for retpoline
On Sat, 2018-01-13 at 03:11 +, Kumar, Venkataramanan wrote:
>
> > My original patch uses "lfence". I was asked to use "pause":
> >
> > https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00969.html
>
> If everyone is ok, my suggestion is to use "lfence" as the default
> loop filler for retpoline
an Hubicka ;
> Dharmakan, Rohit arul raj
> Subject: Re: [PATCH 2/5] x86: Add -mindirect-branch-loop=
>
> On Fri, Jan 12, 2018 at 10:27 AM, Kumar, Venkataramanan
> wrote:
> > Hi HJ,
> >
> >> -Original Message-
> >> From: Kumar, Venkataramanan
>
mar raj ;
>> 'GCC Patches' ; 'Jeff Law' ;
>> Uros Bizjak (ubiz...@gmail.com) ; 'Jan Hubicka'
>>
>> Subject: RE: [PATCH 2/5] x86: Add -mindirect-branch-loop=
>>
>> Hi all,
>>
>> > -Original Message-
>> &g
> > Cc: Nagarajan, Muthu kumar raj ;
> > GCC Patches ; Jeff Law ;
> Uros
> > Bizjak (ubiz...@gmail.com) ; 'Jan Hubicka'
> >
> > Subject: RE: [PATCH 2/5] x86: Add -mindirect-branch-loop=
> >
> > Hi all,
> >
> > > -Ori
On 01/12/2018 07:05 AM, H.J. Lu wrote:
> On Fri, Jan 12, 2018 at 4:38 AM, Martin Jambor wrote:
>> Hi,
>>
>> On Thu, Jan 11 2018, Jeff Law wrote:
>>> On 01/07/2018 03:59 PM, H.J. Lu wrote:
Add -mindirect-branch-loop= option to control loop filler in call and
return thunks generated by -mi
t;> GCC Patches ; Jeff Law ; Uros
>> Bizjak (ubiz...@gmail.com) ; 'Jan Hubicka'
>>
>> Subject: RE: [PATCH 2/5] x86: Add -mindirect-branch-loop=
>>
>> Hi all,
>>
>>> -Original Message-
>>> From: H.J. Lu [mailto:hjl.to...@gmail.c
;
> > Kumar, Venkataramanan ; GCC
> Patches
> > ; Jeff Law
> > Subject: Re: [PATCH 2/5] x86: Add -mindirect-branch-loop=
> >
> > On Fri, Jan 12, 2018 at 4:38 AM, Martin Jambor wrote:
> > > Hi,
> > >
> > > On Thu, Jan 11 2018, Jeff Law
Hi all,
> -Original Message-
> From: H.J. Lu [mailto:hjl.to...@gmail.com]
> Sent: Friday, January 12, 2018 7:36 PM
> To: Martin Jambor
> Cc: Nagarajan, Muthu kumar raj ;
> Kumar, Venkataramanan ; GCC
> Patches ; Jeff Law
> Subject: Re: [PATCH 2/5] x86: Ad
On Fri, Jan 12, 2018 at 4:38 AM, Martin Jambor wrote:
> Hi,
>
> On Thu, Jan 11 2018, Jeff Law wrote:
>> On 01/07/2018 03:59 PM, H.J. Lu wrote:
>>> Add -mindirect-branch-loop= option to control loop filler in call and
>>> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>>> as
Hi,
On Thu, Jan 11 2018, Jeff Law wrote:
> On 01/07/2018 03:59 PM, H.J. Lu wrote:
>> Add -mindirect-branch-loop= option to control loop filler in call and
>> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>> as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses
On Thu, Jan 11, 2018 at 1:42 PM, Jeff Law wrote:
> On 01/07/2018 03:59 PM, H.J. Lu wrote:
>> Add -mindirect-branch-loop= option to control loop filler in call and
>> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>> as loop filler. 'pause' uses "pause" as loop filler. 'no
On 01/07/2018 03:59 PM, H.J. Lu wrote:
> Add -mindirect-branch-loop= option to control loop filler in call and
> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
> as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses "nop"
> as loop filler. The default is 'lfence
On Mon, Jan 8, 2018 at 1:00 PM, David Woodhouse wrote:
> On Mon, 2018-01-08 at 09:20 +0100, Florian Weimer wrote:
>> * H. J. Lu:
>>
>> > Add -mindirect-branch-loop= option to control loop filler in call and
>> > return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>> > as loop fi
On Mon, 2018-01-08 at 09:20 +0100, Florian Weimer wrote:
> * H. J. Lu:
>
> > Add -mindirect-branch-loop= option to control loop filler in call and
> > return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
> > as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses "nop"
On Mon, Jan 8, 2018 at 10:32 AM, Florian Weimer wrote:
> * H. J. Lu:
>
>> On Mon, Jan 8, 2018 at 12:20 AM, Florian Weimer wrote:
>>> * H. J. Lu:
>>>
Add -mindirect-branch-loop= option to control loop filler in call and
return thunks generated by -mindirect-branch=. 'lfence' uses "lfenc
* H. J. Lu:
> On Mon, Jan 8, 2018 at 12:20 AM, Florian Weimer wrote:
>> * H. J. Lu:
>>
>>> Add -mindirect-branch-loop= option to control loop filler in call and
>>> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>>> as loop filler. 'pause' uses "pause" as loop filler. 'n
On Mon, Jan 8, 2018 at 12:20 AM, Florian Weimer wrote:
> * H. J. Lu:
>
>> Add -mindirect-branch-loop= option to control loop filler in call and
>> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
>> as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses "nop"
>> as
* H. J. Lu:
> Add -mindirect-branch-loop= option to control loop filler in call and
> return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
> as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses "nop"
> as loop filler. The default is 'lfence'.
Why is the loop needed
Add -mindirect-branch-loop= option to control loop filler in call and
return thunks generated by -mindirect-branch=. 'lfence' uses "lfence"
as loop filler. 'pause' uses "pause" as loop filler. 'nop' uses "nop"
as loop filler. The default is 'lfence'.
gcc/
* config/i386/i386-opts.h (in
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