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instruction: 0.663
runtime: 0.264
syscall: 0.074
qemu-ppc64le uncaught target signal 4 (Illegal instruction)
qemu-ppc64le version 2.12.0
host machine: x86_64 Arch Linux
I'm currently working on VSX support in libVPX, I'm using qemu to test, on line 723 of vpx_dsp/ppc/loopfilter_vsx.c, when I change the vec_sub to vec_subs I get:
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Thread 1 "qemu-ppc64le" received signal SIGILL, Illegal instruction.
0x00007ffff66d1bf6 in sigsuspend () from /usr/lib/libc.so.6
(gdb) bt
#0 0x00007ffff66d1bf6 in sigsuspend () from /usr/lib/libc.so.6
#1 0x000055555567ee68 in ?? ()
#2 0x000055555567fd18 in ?? ()
#3 0x00005555556805ef in process_pending_signals ()
#4 0x0000555555661e69 in cpu_loop ()
#5 0x000055555561fd72 in main ()
This can be reproduced by downloading this patch (patchset 1):
https://chromium-review.googlesource.com/c/webm/libvpx/+/1134034
and running
qemu-ppc64le -L /home/ltrudeau/x-tools/powerpc64le-unknown-linux-gnu/powerpc64le-unknown-linux-gnu/sysroot/ ./test_libvpx --gtest_also_run_disabled_tests "--gtest_filter=VSX/*Loop*/*"
I don't observe any issues when running the code on a POWER9 machine.
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