Hi,
During GCC 12.2.0 compilation of a file that includes[1] immintrin.h
with both code-optimization and uninitialized-variable-warnings
enabled, a warning is emitted:
/usr/lib/gcc/x86_64-linux-gnu/12/include/avx512erintrin.h:55:20:
warning: ‘__W’ is used uninitialized [-Wuninitialized]
The minimal repro compilation command appears to be:
gcc -O -Wuninitialized -mavx512er -mavx512pf
./numpy/distutils/checks/cpu_avx512_knl.c
My question is: does the warning indicate a possible bug that should
be reported, or is there a reason that the relevant code[2] does not
initialize the variable (for example, for performance reasons)?
Thank you,
James
[1] -
https://github.com/numpy/numpy/blob/bb2769e12a8646f3d63097e9464592aa6e20058d/numpy/distutils/checks/cpu_avx512_knl.c#L14
[2] -
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/i386/avx512erintrin.h;h=6b3b679a17675612f45a1090f227012b80b871a6#l54
