[Bug target/123097] [16 Regression] [RISCV] [Miscompile] GCC - riscv64 target, miscompiles at -O3 since r16-5979

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123097

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |rdapp at gcc dot gnu.org

--- Comment #3 from Robin Dapp <rdapp at gcc dot gnu.org> ---
The interesting part is that for this snippet we query the target's
mask-reduction support but don't actually create the standard name (and
naturally don't expand it either).

My suspicion is that the bit extraction is to blame.  On top it only fails with
VLEN=128, but not with 256 or 512.