#11306: fate-rv40 fails on RVV
-------------------------------------+-------------------------------------
Reporter: Rémi Denis- | Owner: (none)
Courmont |
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Rémi Denis-Courmont:
Old description:
> Summary of the bug:
> How to reproduce:
> {{{
> % make fate-rv40
> }}}
>
> Bissection leads to this:
> ```
> 95d1052fba671d6c4ab6727a6905a637d03211c7 is the first bad commit
> commit 95d1052fba671d6c4ab6727a6905a637d03211c7 (HEAD)
> Author: Rémi Denis-Courmont <r...@remlab.net>
> Date: Sat Nov 18 22:09:57 2023 +0200
>
> lavu/riscv: add hwprobe() for CPU detection
>
> This adds the Linux-specific function call to detect CPU features.
> Unlike
> the more portable auxillary vector, this supports extensions other
> than
> single lettered ones. At this point, FFmpeg already needs this to
> detect
> Zba and Zbb at run-time, and probably will need it for Zvbb in the
> near
> future.
>
> Support will be available in glibc 2.40 onward.
>
> configure | 3 +++
> libavutil/riscv/cpu.c | 25 +++++++++++++++++++++++++
> 2 files changed, 28 insertions(+)
> ```
> This commit is ostensibly a scape-goat. The broken optimisation
> presumably depends on the Bitmap extension, and was disabled in previous
> commits.
New description:
Summary of the bug:
How to reproduce:
{{{
% make fate-rv40
}}}
Bissection leads to this:
{{{
95d1052fba671d6c4ab6727a6905a637d03211c7 is the first bad commit
commit 95d1052fba671d6c4ab6727a6905a637d03211c7 (HEAD)
Author: Rémi Denis-Courmont <r...@remlab.net>
Date: Sat Nov 18 22:09:57 2023 +0200
lavu/riscv: add hwprobe() for CPU detection
This adds the Linux-specific function call to detect CPU features.
Unlike
the more portable auxillary vector, this supports extensions other
than
single lettered ones. At this point, FFmpeg already needs this to
detect
Zba and Zbb at run-time, and probably will need it for Zvbb in the
near
future.
Support will be available in glibc 2.40 onward.
configure | 3 +++
libavutil/riscv/cpu.c | 25 +++++++++++++++++++++++++
2 files changed, 28 insertions(+)
}}}
This commit is ostensibly a scapegoat. The broken optimisation presumably
depends on the Bitmap extension, and was disabled in previous commits.
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11306#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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