ffmpeg armhf uses NEON instructions
Version: 7:6.0-6
Severity: normal
Dear maintainer,
The current armhf build of ffmpeg uses NEON instructions, which
prevents it from running on some processors. See log below:
$ ulimit -c unlimited
$ ffmpeg
Illegal instruction (core dumped)
$ gdb /usr/bin/ffmpeg core
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Reading symbols from /usr/bin/ffmpeg…
(No debugging symbols found in /usr/bin/ffmpeg)
[New LWP 988]
[Thread debugging using libthread_db enabled]
Using host libthread_db library “/lib/arm-linux-gnueabihf/libthread_db.so.1”.
Core was generated by `ffmpeg’.
Program terminated with signal SIGILL, Illegal instruction.
#0 0xb4ba6fbe in ?? () from /lib/arm-linux-gnueabihf/libhwy.so.1
(gdb) layout asm
┌─────────────────────────────────────────────────────────┐
│ > 0xb4ba6fbe vmov.i32 d16, #0 @ 0x00000000 │
│ 0xb4ba6fc2 movs r6, #0 │
│ 0xb4ba6fc4 str r6, [sp, #16] │
│ 0xb4ba6fc6 ldr r2, [r1, r2] │
│ 0xb4ba6fc8 ldr r2, [r2, #0] │
│ 0xb4ba6fca str r2, [sp, #44] @ 0x2c │
│ 0xb4ba6fcc mov.w r2, #0 │
│ 0xb4ba6fd0 vstr d16, [sp, #8] │
│ 0xb4ba6fd4 cmp.w r9, #0 │
│ 0xb4ba6fd8 beq.w 0xb4ba7180 │
│ 0xb4ba6fdc mov r4, r0 │
│ 0xb4ba6fde mov r5, r6 │
│ 0xb4ba6fe0 mov r8, r6 │
│ 0xb4ba6fe2 mov.w r10, #1 │
│ 0xb4ba6fe6 add.w r11, sp, #24 │
│ 0xb4ba6fea sub.w r3, r0, #8 │
│ 0xb4ba6fee str r3, [sp, #4] │
│ 0xb4ba6ff0 ldr r2, [sp, #4] │
│ 0xb4ba6ff2 subs r3, r5, r6 │
│ 0xb4ba6ff4 mov.w r12, r3, asr #6 │
│ 0xb4ba6ff8 asrs r0, r3, #4 │
│ 0xb4ba6ffa ldr.w r1, [r2, #8]! │
│ 0xb4ba6ffe cmp.w r12, #0 │
└─────────────────────────────────────────────────────────┘
multi-thre Thread 0xb3031020 ( In: L?? PC: 0xb4ba6fbe
(gdb) exit
$ cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 2 (v7l)
BogoMIPS : 50.00
Features : half thumb fastmult vfp edsp thumbee vfpv3 tls idivt
vfpd32 lpae
CPU implementer : 0x56
CPU architecture: 7
CPU variant : 0x2
CPU part : 0x584
CPU revision : 2
processor : 1
model name : ARMv7 Processor rev 2 (v7l)
BogoMIPS : 50.00
Features : half thumb fastmult vfp edsp thumbee vfpv3 tls idivt
vfpd32 lpae
CPU implementer : 0x56
CPU architecture: 7
CPU variant : 0x2
CPU part : 0x584
CPU revision : 2
Hardware : Marvell Armada 370/XP (Device Tree)
Revision : 0000
Serial : 0000000000000000
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