[Bug target/57819] Suboptimal shift patterns

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57819

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jul  8 08:48:40 2013
New Revision: 200775

URL: http://gcc.gnu.org/viewcvs?rev=200775&root=gcc&view=rev
Log:
    PR target/57819
    * simplify-rtx.c (simplify_unary_operation_1) <case ZERO_EXTEND>:
    Simplify (zero_extend:SI (subreg:QI (and:SI (reg:SI)
    (const_int 63)) 0)).
    * combine.c (make_extraction): Create ZERO_EXTEND or SIGN_EXTEND
    using simplify_gen_unary instead of gen_rtx_*_EXTEND.
    * config/i386/i386.md (*jcc_bt<mode>_1): New define_insn_and_split.

    * gcc.target/i386/pr57819.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr57819.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/config/i386/i386.md
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog