[Bug rtl-optimization/126426] riscv rvv: Incorrect result with -march=rva23u64 -O2 in libgav1

"rdapp at gcc dot gnu.org via Gcc-bugs" <[email protected]> Sat, 01 Aug 2026 19:24:12 +0000

Newsgroups	gmane.comp.gcc.bugs
Message-ID	<[email protected]/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126426

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |rtl-optimization

--- Comment #4 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Yeah, looks indeed ext-dce related.  -march=rv64gcv works, -march=rv64gcbv
doesn't and -fno-ext-dce gets it back to working.  Difference is purely in
scalar code.