[Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro

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

------- Comment #12 from jakub at gcc dot gnu dot org  2009-01-09 17:13 -------
Subject: Bug 38708

Author: jakub
Date: Fri Jan  9 17:12:40 2009
New Revision: 143211

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143211
Log:
        PR target/38686
        PR target/38708
        * config/i386/i386.c (override_options): Reject
        -mstringop-strategy=rep_8byte with -m32.
        (ix86_expand_movmem): For size_needed == 1 set epilogue_size_needed
        to 1.  Do count comparison against epilogue_size_needed at compile
        time even when count_exp was constant forced into register.  For
        size_needed don't jump to epilogue, instead just avoid aligning
        and invoke the body algorithm.  If need_zero_guard, add zero guard
        even if count is non-zero, but smaller than size_needed + number of
        bytes that could be stored for alignment.
        (ix86_expand_setmem): For size_needed == 1 set epilogue_size_needed
        to 1.  If need_zero_guard, add zero guard even if count is non-zero,
        but smaller than size_needed + number of bytes that could be stored
        for alignment.  Compare size_needed with epilogue_size_needed instead
        of desired_align - align, don't adjust size_needed, pass
        epilogue_size_needed to the epilogue expanders.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708