[Bug rtl-optimization/29329] [4.1 regression] internal consistency failure

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

------- Comment #7 from ebotcazou at gcc dot gnu dot org  2007-01-21 22:32 -------
Subject: Bug 29329

Author: ebotcazou
Date: Sun Jan 21 22:32:39 2007
New Revision: 121037

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=121037
Log:
        PR rtl-optimization/29329
        * combine.c (replaced_rhs_insn): Rename to i2mod.
        (replaced_rhs_value): Rename to i2mod_new_rhs.
        (i2mod_old_rhs): New global variable.
        (combine_instructions): Adjust for above change.  Save a copy of
        the old RHS into i2mod_old_rhs when the contents of a REG_EQUAL
        note are substituted in the second instruction.
        (distribute_notes) <REG_DEAD>: Adjust for above change.  Do not
        ditch the note if it pertains to the second eliminated register
        and this register is mentioned in i2mod_old_rhs.

        Revert:
        2006-09-12  Eric Botcazou  <ebotcazou@libertysurf.fr>

        * combine.c (distribute_notes) <REG_DEAD>: Do not consider SETs past
        the insn to which the note was originally attached.


Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/20070121.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29329