[Bug tree-optimization/20256] Perfect nest transformation not conservative enough

["spop at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #11 from spop at gcc dot gnu dot org  2006-05-17 14:26 -------
Subject: Bug 20256

Author: spop
Date: Wed May 17 14:25:59 2006
New Revision: 113862

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113862
Log:
        PR middle-end/20256
        PR middle-end/26435
        * tree-loop-linear.c (linear_transform_loops): Don't test
perfect_nest_p.
        Call rewrite_into_loop_closed_ssa only when something changed.
        * lambda.h (gcc_loopnest_to_lambda_loopnest): Update declaration.
        * lambda-code.c (can_convert_to_perfect_nest): Declared.
        (gcc_loopnest_to_lambda_loopnest): Removed need_perfect_nest parameter.
        Test for perfect_nest_p here.  Fix formating.
        (replace_uses_equiv_to_x_with_y): Fix formating.
        (stmt_uses_op): Removed.
        (can_convert_to_perfect_nest): Removed loopivs parameter.
        Complete the test by checking the scalar dependences.
        (perfect_nestify): Remove the test for can_convert_to_perfect_nest.
        Fix formating.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr20256.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr26435.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/lambda-code.c
    trunk/gcc/lambda.h
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ltrans-1.c
    trunk/gcc/tree-loop-linear.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20256