[Bug target/84431] Suboptimal code for masked shifts (x86/x86-64)

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84431

--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Sat Apr 28 07:37:04 2018
New Revision: 259739

URL: https://gcc.gnu.org/viewcvs?rev=259739&root=gcc&view=rev
Log:
        PR target/84431
        * config/i386/i386.md (*ashl<dwi>3_doubleword_mask): New pattern.
        (*ashl<dwi>3_doubleword_mask_1): Ditto.
        (*<shift_insn><dwi>3_doubleword_mask): Ditto.
        (*<shift_insn><dwi>3_doubleword_mask_1): Ditto.

testsuite/ChangeLog:

        PR target/84431
        * gcc.target/i386/pr84431.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr84431.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog