[Bug target/126980] -march=znver[456] doesn't honor -Os

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126980

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-08-21

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by

/* X86_TUNE_AVX512_MOVE_BY_PIECES: Optimize move_by_pieces with 512-bit
   AVX instructions.  */
DEF_TUNE (X86_TUNE_AVX512_MOVE_BY_PIECES, "avx512_move_by_pieces",
           m_ZNVER4 | m_ZNVER5 | m_ZNVER6 | m_C86_4G_M7 | m_C86_4G_M8)