[Bug rtl-optimization/69806] [6 Regression][SH] Combine doesn't see constant

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69806

--- Comment #11 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Author: olegendo
Date: Mon Feb 22 13:33:31 2016
New Revision: 233601

URL: https://gcc.gnu.org/viewcvs?rev=233601&root=gcc&view=rev
Log:
gcc/
        PR target/69806
        PR target/54089
        * config/sh/sh.c (sh_lshrsi_clobbers_t_reg_p, sh_dynamicalize_shift_p):
        Handle negative shift counts.
        * config/sh/sh.md (ashlsi3, lshrsi3_n, lshrsi3_n_clobbers_t): Don't use
        force_reg on the shift constant.
        (lshrsi3): Likewise.  Expand into lshrsi3_n* instead of lshrsi3_d.
        (lshrsi3_d): Handle negative shift counts.

gcc/testsuite/
        PR target/69806
        PR target/54089
        * gcc.target/sh/pr54089-10.c: New.


Added:
    trunk/gcc/testsuite/gcc.target/sh/pr54089-10.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/sh/sh.c
    trunk/gcc/config/sh/sh.md
    trunk/gcc/testsuite/ChangeLog