[Bug rtl-optimization/38711] ira should not be using df-lr except at -O1.

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38711

--- Comment #4 from Steven Bosscher <steven at gcc dot gnu.org> 2012-10-28 11:52:16 UTC ---
Author: steven
Date: Sun Oct 28 11:52:11 2012
New Revision: 192890

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192890
Log:
    PR rtl-optimization/38711
    * ira.c (ira): Remove DF_LIVE if the problem is in the stack.
    (do_reload): Add it back at the end for -O2 and higher.

    * function.c (thread_prologue_and_epilogue_insns): Use
    REG_SET_TO_HARD_REG_SET instead of CLEAR_HARD_REG_SET and
    reg_set_to_hard_reg_set.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/function.c
    trunk/gcc/ira.c