[Bug c/89256] No optimized division by constant for __int128

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89256

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

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

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
It's not so easy, as this trick needs a widening multiply or a high-multiply
operation: e.g. in func64, the compiler uses upper 64 bits of the 128-bit
product of two 64-bit operands.

In func128, it would need to obtain 128 upper bits of a 256-bit product, which
no CPU offers as part of instruction set; so it would need to be a libcall for
a TImode high-multiply operation.