[Bug rtl-optimization/45903] unnecessary load of 32/64bit variable when only 8 bits are needed

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45903

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-10-08 
20:49:24 UTC ---
Author: jakub
Date: Fri Oct  8 20:49:19 2010
New Revision: 165200

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165200
Log:
    PR tree-optimization/45903
    * simplify-rtx.c (simplify_subreg): Optimize lowpart SUBREG
    of *SHIFTRT of MEM.

    * gcc.target/i386/pr45903.c: New test.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog