Buggy vectorization of dot products

Bug #1292489 reported by Роман Донченко
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Linaro GCC
Status tracked in 4.8
4.7
Fix Released
Medium
Michael Collison
4.8
Fix Released
Medium
Michael Collison

Bug Description

There's a bug in GCC 4.8 related to vectorization of dot product-like code: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60196.

4.8 is the only upstream branch that's affected, however, you seem to have backported the revision introducing the bug (r185437) into 4.6 and 4.7 as well, and those are now affected as well. Since the fix is already available (r202663), please backport it to the affected branches.

Revision history for this message
Ryan S. Arnold (ryan-arnold) wrote : Re: [Bug 1292489] [NEW] Buggy vectorization of dot products

Hi Michael,

please address this issue when you get a chance.

On Fri, Mar 14, 2014 at 7:02 AM, Роман Донченко <email address hidden> wrote:
> Public bug reported:
>
> There's a bug in GCC 4.8 related to vectorization of dot product-like
> code: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60196.
>
> 4.8 is the only upstream branch that's affected, however, you seem to
> have backported the revision introducing the bug (r185437) into 4.6 and
> 4.7 as well, and those are now affected as well. Since the fix is
> already available (r202663), please backport it to the affected
> branches.
>
> ** Affects: gcc-linaro
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are a member of Linaro
> Toolchain Developers, which is subscribed to Linaro GCC.
> https://bugs.launchpad.net/bugs/1292489
>
> Title:
> Buggy vectorization of dot products
>
> Status in Linaro GCC:
> New
>
> Bug description:
> There's a bug in GCC 4.8 related to vectorization of dot product-like
> code: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60196.
>
> 4.8 is the only upstream branch that's affected, however, you seem to
> have backported the revision introducing the bug (r185437) into 4.6
> and 4.7 as well, and those are now affected as well. Since the fix is
> already available (r202663), please backport it to the affected
> branches.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/gcc-linaro/+bug/1292489/+subscriptions

--
Ryan S. Arnold
Linaro Toolchain Working Group
www.linaro.org

Revision history for this message
Ryan S. Arnold (ryan-arnold) wrote :

Thanks, We'll address.

Revision history for this message
Michael Collison (michael-collison) wrote :

When do you want me to address this? After the a53 work?

On 03/14/2014 07:07 AM, Ryan S. Arnold wrote:
> Hi Michael,
>
> please address this issue when you get a chance.
>
> On Fri, Mar 14, 2014 at 7:02 AM, Роман Донченко <email address hidden> wrote:
>> Public bug reported:
>>
>> There's a bug in GCC 4.8 related to vectorization of dot product-like
>> code: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60196.
>>
>> 4.8 is the only upstream branch that's affected, however, you seem to
>> have backported the revision introducing the bug (r185437) into 4.6 and
>> 4.7 as well, and those are now affected as well. Since the fix is
>> already available (r202663), please backport it to the affected
>> branches.
>>
>> ** Affects: gcc-linaro
>> Importance: Undecided
>> Status: New
>>
>> --
>> You received this bug notification because you are a member of Linaro
>> Toolchain Developers, which is subscribed to Linaro GCC.
>> https://bugs.launchpad.net/bugs/1292489
>>
>> Title:
>> Buggy vectorization of dot products
>>
>> Status in Linaro GCC:
>> New
>>
>> Bug description:
>> There's a bug in GCC 4.8 related to vectorization of dot product-like
>> code: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60196.
>>
>> 4.8 is the only upstream branch that's affected, however, you seem to
>> have backported the revision introducing the bug (r185437) into 4.6
>> and 4.7 as well, and those are now affected as well. Since the fix is
>> already available (r202663), please backport it to the affected
>> branches.
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/gcc-linaro/+bug/1292489/+subscriptions
>

--
Michael Collison
Linaro Toolchain Working Group
<email address hidden>

Fathi Boudra (fboudra)
Changed in gcc-linaro:
status: New → Confirmed
importance: Undecided → Medium
assignee: nobody → Michael Collison (michael-collison)
Yvan Roux (yvan-roux)
Changed in gcc-linaro:
milestone: none → 4.7-2014.04
status: Confirmed → Fix Committed
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