2021-05-27  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
    PR target/100637
    * config/i386/mmx.md (uavgv4qi3_ceil): New insn pattern.
    (uavgv2hi3_ceil): Ditto.

gcc/testsuite/

    PR target/100637
    * gcc.target/i386/pr100637-3b.c (avgu): New test.
    * gcc.target/i386/pr100637-3w.c (avgu): Ditto.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Pushed to master.

Uros.