[Bug tree-optimization/43491] Unnecessary temporary for global register variable

[jye2 at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43491

--- Comment #6 from jye2 at gcc dot gnu.org 2011-12-23 05:43:17 UTC ---
Author: jye2
Date: Fri Dec 23 05:43:09 2011
New Revision: 182650

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182650
Log:
2011-12-22  Bin Cheng  <bin.cheng@arm.com>
    Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/43491
    * tree-ssa-pre.c (eliminate): Don't replace global register
    variable when it is the RHS of a single assign.

    testsuite:
    * gcc.dg/tree-ssa/pr43491.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr43491.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c