[Bug target/93127] PPC altivec vec_promote creates unnecessary xxpermdi instruction

[guihaoc at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93127

HaoChen Gui <guihaoc at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |guihaoc at gcc dot gnu.org

--- Comment #4 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
I committed a patch (r12-4987) which is related to this issue. But it doesn't
behave as the ticket expects. With the patch, vec_min/max is bound to
xv[min|max]dp when fast-math is not set. If fast-math is set, it can be folded
into scalar comparison. So with fast-math is set, the code could be
        xsmaxdp 1,1,2
        blr