[Bug rtl-optimization/35281] [4.3 Regression] multiply with 0 generated for 64*32->64

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

------- Comment #20 from bonzini at gnu dot org  2008-07-18 11:45 -------
Subject: Bug 35281

Author: bonzini
Date: Fri Jul 18 11:44:57 2008
New Revision: 137942

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=137942
Log:
gcc:
2008-07-18  Paolo Bonzini  <bonzini@gnu.org>

        PR rtl-optimization/35281
        * expr.c (convert_move): Use a new pseudo for the intermediate
        from_mode->word_mode result.
        * fwprop.c (PR_CAN_APPEAR, PR_HANDLE_MEM): New.
        (propagate_rtx_1): Handle PR_HANDLE_MEM.
        (propagate_rtx): Pass PR_HANDLE_MEM if appropriate.
        (varying_mem_p): Move above propagate_rtx.
        (all_uses_available_at): Do not check MEMs.

gcc/testsuite:
2008-07-18  Paolo Bonzini  <bonzini@gnu.org>

        PR rtl-optimization/35281
        * gcc.target/i386/pr35281.c: New.


Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.target/i386/pr35281.c
      - copied unchanged from r133859,
trunk/gcc/testsuite/gcc.target/i386/pr35281.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/expr.c
    branches/gcc-4_3-branch/gcc/fwprop.c
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35281