patch to fix PR55154

[Vladimir Makarov <vmakarov at redhat dot com>]

  The following patch fixes

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55154

  The insn in question has 2 alternatives.  The first alternative is 
rejected because operand constraint is class containing non-allocated 
hard reg for given options.  The second alternative was rejected by LRA 
as the maximal cost was achieved. Reload sets up to close to maximal 
cost when it sees ! and this is the last operand (imho setting to max 
reject in reload is wrong as if ! were in the 1st operand, reload would 
also reject the alternative).  LRA accumulates the costs and with 
reloads of previous operands it easily achieved maximal cost.  The patch 
affects a sensible code of LRA and therefore was rigorously tested.

  The patch was successfully bootstrapped and tested on x86/x86-64.

  Committed as rev. 193364.

2012-11-09  Vladimir Makarov  <vmakarov@redhat.com>

        PR tree-optimization/55154
        * lra-int.h (LRA_LOSER_COST_FACTOR, LRA_MAX_REJECT): New macros.
        * lra.c (setup_operand_alternative): Use them.
        * lra-constraints.c (LOSER_COST_FACTOR, MAX_OVERALL_COST_BOUND):
        Remove.
        (process_alt_operands): Use LRA_LOSER_COST_FACTOR and
        LRA_MAX_REJECT.  Accumulate reject instead of setting for
        non-const.
        (curr_insn_transform): Initialize best_losers and best_overall by
        INT_MAX.

2012-11-09  Vladimir Makarov <vmakarov@redhat.com>

        PR rtl-optimization/55154
        * gcc.target/i386/pr55154.c: New test.

Attachment: pr55154.patch
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