I'm trying to find a way to run MSA code using QEMU. I've been able to get *some* MSA instructions to execute on Loongson-3A4000, but eventually I get a SIGILL.
I have access to the source code, and I don't really care what CPU I'm targeting as long as it supports MSA, but I've had the most luck with GCC targeting mips64el. The goal is actually to add an implementation of MSA to SIMDe (<https://github.com/simd-everywhere/simde>), but I need to be able to verify that I'm getting the same results as a different implementation, and since I don't have any MIPS hardware that means QEMU :) As an example of some failing code, I've compiled one of our tests (https://github.com/simd-everywhere/simde/blob/master/test/arm/neon/add.c ) and uploaded an executable to https://www.dropbox.com/s/skhfxi7ki0zozra/add-native-c?dl=0 It's compiled with: mips64el-linux-gnuabi64-gcc-10 -DSIMDE_TEST_BARE -g -mmsa -static \ -o add-native-c path/to/add.c -lm If you want to try changing compilation options, here is the amalgamated (not preprocessed, so it should work with clang too) source code: https://www.dropbox.com/s/0jf8cs6cmzhjn13/add.c?dl=0 Attempting to run it with qemu (5.2.0, from Debian): qemu-mips64el-static -cpu Loongson-3A4000 ./add-native-c1..22 ok 1 add/vaddd_s64 ok 2 add/vaddd_u64 ok 3 add/vadd_f32 ok 4 add/vadd_f64 ok 5 add/vadd_s8 ok 6 add/vadd_s16 ok 7 add/vadd_s32 ok 8 add/vadd_s64 ok 9 add/vadd_u8 ok 10 add/vadd_u16 ok 11 add/vadd_u32 ok 12 add/vadd_u64 qemu: uncaught target signal 4 (Illegal instruction) - core dumped Illegal instruction (core dumped) If I add -d in_asm, I see it crashes on ld.b, which is indeed an MSA instruction. I've tried with every -cpu supported by qemu, and nothing has worked. Any help would be greatly appreciated; FWIW, I'm definitely open to compiling a patched QEMU if it would help.
