[Bug rtl-optimization/78952] Combine does not convert 8-bit sign-extract to a zero-extract for QImode operations

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78952

--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Jan 18 19:24:30 2017
New Revision: 244591

URL: https://gcc.gnu.org/viewcvs?rev=244591&root=gcc&view=rev
Log:
        PR rtl-optimization/78952
        * config/i386/i386.md (any_extract): New code iterator.
        (*insvqi_2): Use any_extract for source operand.
        (*insvqi_3): Use any_shiftrt for source operand.

testsuite/ChangeLog:

        PR rtl-optimization/78952
        * gcc.target/i386/pr78952-1.c: New test.
        * gcc.target/i386/pr78952-2.c: Ditto.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr78952-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr78952-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog