On 5/6/2016 6:08 AM, Hendrik Leppkes wrote:
On Tue, Feb 9, 2016 at 1:28 AM, Timothy Gu <timothyg...@gmail.com> wrote:
On Sun, Jan 31, 2016 at 3:38 PM Timothy Gu <timothyg...@gmail.com> wrote:
On Sat, Jan 30, 2016 at 07:27:22PM +0000, Derek Buitenhuis wrote:
On 1/30/2016 7:15 PM, Timothy Gu wrote:
FATE passes here on a x86-64 machine with both GCC 4.9.2 and 5.3.1.
Perhaps this should be restricted to x86?
Fair enough.
Pushed.
Just to document it, this has caused build breakage in various
scenarios, even in GCC 5.3 (6.1 not tested).
The latest reported on IRC just today here:
libavcodec/sbrdsp.c: In function 'sbr_neg_odd_64_c':
libavcodec/sbrdsp.c:47:13: internal compiler error: in
vect_analyze_data_ref_accesses, at tree-vect-data-refs.c:2596
static void sbr_neg_odd_64_c(float *x)
There are various other cases which usually involve inline asm when
building with SIMD (ie. --cpu=host) and the optimizer running out of
registers, for example:
libavcodec/x86/cabac.h:192:5: error: 'asm' operand has impossible constraints
IMHO this feature is not quite ready to be enabled unconditionally in
our code base, and we should re-evaluate this change.
- Hendrik
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It may also be miscompiling the code on i686 (or specifically MinGW-w64
builds on i686), since I was encountering segfaults at random at
startup* in builds of mpv linked against affected FFmpeg builds, but not
in ffmpeg.exe itself. Disabling tree vectorization in extra-cflags
resolved it.
It might work seemingly correctly the first couple invocations,
then start crashing on #4 onward. But then at a different
time, it would always fail, or work a different number of
times before failing. That was on Silvermont* with 2 GBs of RAM;
on my old Pentium III and 512 MBs of RAM, it seemed to always
fail.
*still 32-bit Windows, though.
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