sjoerdmeijer wrote:

Hey @davemgreen, we are looking at a runtime failure in a test from the GCC 
test-suite: 
`./testsuite/gcc.target/aarch64/advsimd-intrinsics/vfmash_lane_f16_1.c`

I think to reproduce this, this will work:

   clang vfmash_lane_f16_1.c -mcpu=neoverse-v2 -O0 -lm -o 
./vfmash_lane_f16_1.exe

and

    $ ./vfmash_lane_f16_1.exe
     Aborted

Seems to be fine when compiled with -O1 and up.

There are some scary compiler warning messages, e.g.:

  ./arm-neon-ref.h:335:41: warning: value size does not match register size 
specified by the constraint and modifier [-Wasm-operand-widths]  

But haven't looked yet if this important, also haven't looked at the root cause 
yet.

https://github.com/llvm/llvm-project/pull/120363
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