[Buildroot] [Bug 11996] opencv3 SIGILL on Cortex-A5 with VFPv4-D16
bugzilla at busybox.net
bugzilla at busybox.net
Wed Nov 27 22:20:51 UTC 2019
https://bugs.busybox.net/show_bug.cgi?id=11996
--- Comment #2 from Thomas Petazzoni <thomas.petazzoni at free-electrons.com> ---
So, I did a bit more research on this, but couldn't come to a useful
conclusion. The handling of CPU optimizations in opencv3 is complicated.
ENABLE_VFPV3 and ENABLE_NEON seem to be obsolete options, but the replacement
CPU_BASELINE is not very clear.
With a VFPv3-D16 case, I get:
-- CPU/HW features:
-- Baseline:
-- requested: DETECT
-- disabled: VFPV3 NEON
which is quite expected.
When NEON is enabled as the FPU, I get:
-- CPU/HW features:
-- Baseline: NEON
-- requested: DETECT
-- disabled: VFPV3 NEON
So NEON seems to be detected, but it's also listed in the "disabled"
features... which doesn't make a lot of sense.
Then, if I use VFPv3 as the FPU, I get:
-- CPU/HW features:
-- Baseline:
-- requested: DETECT
-- disabled: VFPV3 NEON
I.e, it doesn't detect that I have VFPv3.
(Of course the tests above are after removing ENABLE_VFPV3/ENABLE_NEON).
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